Quarterly report pursuant to Section 13 or 15(d)

Real Estate and Intangible Assets - Fair Value of Acquired Assets and Liabilities Assumed (Detail)

v2.4.0.8
Real Estate and Intangible Assets - Fair Value of Acquired Assets and Liabilities Assumed (Detail) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Loans At Acquisition Date [Line Items]    
Total Purchase Price $ 105,638 $ 58,065
Egg Harbor Township, NJ [Member]
   
Loans At Acquisition Date [Line Items]    
Total Purchase Price 5,650  
Vance, AL [Member]
   
Loans At Acquisition Date [Line Items]    
Total Purchase Price 13,388  
Blaine, MN [Member]
   
Loans At Acquisition Date [Line Items]    
Total Purchase Price 14,450  
Austin, TX [Member]
   
Loans At Acquisition Date [Line Items]    
Total Purchase Price 57,000  
Allen, TX [Member]
   
Loans At Acquisition Date [Line Items]    
Total Purchase Price 15,150  
Ashburn, VA [Member]
   
Loans At Acquisition Date [Line Items]    
Total Purchase Price   10,775
Ottumwa, IA [Member]
   
Loans At Acquisition Date [Line Items]    
Total Purchase Price   7,100
New Albany, OH [Member]
   
Loans At Acquisition Date [Line Items]    
Total Purchase Price   13,333
Columbus, GA [Member]
   
Loans At Acquisition Date [Line Items]    
Total Purchase Price   7,320
Columbus, OH [Member]
   
Loans At Acquisition Date [Line Items]    
Total Purchase Price   4,037
Jupiter, FL [Member]
   
Loans At Acquisition Date [Line Items]    
Total Purchase Price   15,500
Customer Relationships [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired 6,994 3,510
Customer Relationships [Member] | Egg Harbor Township, NJ [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired 259  
Customer Relationships [Member] | Vance, AL [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired 627  
Customer Relationships [Member] | Blaine, MN [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired 816  
Customer Relationships [Member] | Austin, TX [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired 3,793  
Customer Relationships [Member] | Allen, TX [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired 1,499  
Customer Relationships [Member] | Ashburn, VA [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired   499
Customer Relationships [Member] | Ottumwa, IA [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired   499
Customer Relationships [Member] | New Albany, OH [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired   903
Customer Relationships [Member] | Columbus, GA [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired   375
Customer Relationships [Member] | Columbus, OH [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired   325
Customer Relationships [Member] | Jupiter, FL [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired   909
Above Market Leases [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired 336 160
Above Market Leases [Member] | Allen, TX [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired 336  
Above Market Leases [Member] | New Albany, OH [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired   47
Above Market Leases [Member] | Columbus, OH [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired   113
Below Market Leases [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired 1,168 107
Below Market Leases [Member] | Austin, TX [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired 1,168  
Below Market Leases [Member] | Ottumwa, IA [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired   107
Discount on Assumed Debt [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired   867
Discount on Assumed Debt [Member] | Jupiter, FL [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired   867
Land [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired 8,173 5,656
Land [Member] | Egg Harbor Township, NJ [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired 1,627  
Land [Member] | Vance, AL [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired 457  
Land [Member] | Blaine, MN [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired 1,060  
Land [Member] | Austin, TX [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired 2,330  
Land [Member] | Allen, TX [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired 2,699  
Land [Member] | Ashburn, VA [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired   706
Land [Member] | Ottumwa, IA [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired   212
Land [Member] | New Albany, OH [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired   1,658
Land [Member] | Columbus, GA [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired   1,378
Land [Member] | Columbus, OH [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired   542
Land [Member] | Jupiter, FL [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired   1,160
Building [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired 64,768 35,804
Building [Member] | Egg Harbor Township, NJ [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired 2,735  
Building [Member] | Vance, AL [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired 9,721  
Building [Member] | Blaine, MN [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired 9,347  
Building [Member] | Austin, TX [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired 37,207  
Building [Member] | Allen, TX [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired 5,758  
Building [Member] | Ashburn, VA [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired   6,551
Building [Member] | Ottumwa, IA [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired   4,743
Building [Member] | New Albany, OH [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired   7,511
Building [Member] | Columbus, GA [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired   3,894
Building [Member] | Columbus, OH [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired   1,856
Building [Member] | Jupiter, FL [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired   11,249
Tenant Improvements [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired 11,263 4,839
Tenant Improvements [Member] | Egg Harbor Township, NJ [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired 282  
Tenant Improvements [Member] | Vance, AL [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired 808  
Tenant Improvements [Member] | Blaine, MN [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired 1,172  
Tenant Improvements [Member] | Austin, TX [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired 6,814  
Tenant Improvements [Member] | Allen, TX [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired 2,187  
Tenant Improvements [Member] | Ashburn, VA [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired   1,307
Tenant Improvements [Member] | Ottumwa, IA [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired   329
Tenant Improvements [Member] | New Albany, OH [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired   1,235
Tenant Improvements [Member] | Columbus, GA [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired   626
Tenant Improvements [Member] | Columbus, OH [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired   597
Tenant Improvements [Member] | Jupiter, FL [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired   745
In-place Leases [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired 10,659 5,434
In-place Leases [Member] | Egg Harbor Township, NJ [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired 558  
In-place Leases [Member] | Vance, AL [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired 1,097  
In-place Leases [Member] | Blaine, MN [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired 1,361  
In-place Leases [Member] | Austin, TX [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired 6,118  
In-place Leases [Member] | Allen, TX [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired 1,525  
In-place Leases [Member] | Ashburn, VA [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired   804
In-place Leases [Member] | Ottumwa, IA [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired   940
In-place Leases [Member] | New Albany, OH [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired   1,122
In-place Leases [Member] | Columbus, GA [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired   574
In-place Leases [Member] | Columbus, OH [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired   391
In-place Leases [Member] | Jupiter, FL [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired   1,603
Leasing Costs [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired 4,613 3,636
Leasing Costs [Member] | Egg Harbor Township, NJ [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired 189  
Leasing Costs [Member] | Vance, AL [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired 678  
Leasing Costs [Member] | Blaine, MN [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired 694  
Leasing Costs [Member] | Austin, TX [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired 1,906  
Leasing Costs [Member] | Allen, TX [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired 1,146  
Leasing Costs [Member] | Ashburn, VA [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired   908
Leasing Costs [Member] | Ottumwa, IA [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired   484
Leasing Costs [Member] | New Albany, OH [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired   857
Leasing Costs [Member] | Columbus, GA [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired   473
Leasing Costs [Member] | Columbus, OH [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired   213
Leasing Costs [Member] | Jupiter, FL [Member]
   
Loans At Acquisition Date [Line Items]    
Fair value of acquired assets and liabilities assumed related to the properties acquired   $ 701