Quarterly report pursuant to Section 13 or 15(d)

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

v3.4.0.3
Real Estate and Intangible Assets - Fair Value of Acquired Assets and Liabilities Assumed (Detail)
$ in Thousands
 3 Months Ended
Mar. 31, 2015
USD ($)
Business Acquisition [Line Items]  
Total Purchase Price $ 28,348
Customer Relationships [Member]  
Business Acquisition [Line Items]  
Fair value of acquired assets related to the properties acquired 2,289
Above Market Leases [Member]  
Business Acquisition [Line Items]  
Fair value of acquired assets related to the properties acquired 807
Richardson, TX [Member]  
Business Acquisition [Line Items]  
Total Purchase Price 24,700
Richardson, TX [Member] | Customer Relationships [Member]  
Business Acquisition [Line Items]  
Fair value of acquired assets related to the properties acquired 1,929
Richardson, TX [Member] | Above Market Leases [Member]  
Business Acquisition [Line Items]  
Fair value of acquired assets related to the properties acquired 807
Birmingham, AL [Member]  
Business Acquisition [Line Items]  
Total Purchase Price 3,648
Birmingham, AL [Member] | Customer Relationships [Member]  
Business Acquisition [Line Items]  
Fair value of acquired assets related to the properties acquired 360
Land [Member]  
Business Acquisition [Line Items]  
Fair value of acquired assets related to the properties acquired 3,378
Land [Member] | Richardson, TX [Member]  
Business Acquisition [Line Items]  
Fair value of acquired assets related to the properties acquired 2,728
Land [Member] | Birmingham, AL [Member]  
Business Acquisition [Line Items]  
Fair value of acquired assets related to the properties acquired 650
Building [Member]  
Business Acquisition [Line Items]  
Fair value of acquired assets related to the properties acquired 14,274
Building [Member] | Richardson, TX [Member]  
Business Acquisition [Line Items]  
Fair value of acquired assets related to the properties acquired 12,591
Building [Member] | Birmingham, AL [Member]  
Business Acquisition [Line Items]  
Fair value of acquired assets related to the properties acquired 1,683
Tenant Improvements [Member]  
Business Acquisition [Line Items]  
Fair value of acquired assets related to the properties acquired 3,132
Tenant Improvements [Member] | Richardson, TX [Member]  
Business Acquisition [Line Items]  
Fair value of acquired assets related to the properties acquired 2,781
Tenant Improvements [Member] | Birmingham, AL [Member]  
Business Acquisition [Line Items]  
Fair value of acquired assets related to the properties acquired 351
In-Place Leases [Member]  
Business Acquisition [Line Items]  
Fair value of acquired assets related to the properties acquired 2,518
In-Place Leases [Member] | Richardson, TX [Member]  
Business Acquisition [Line Items]  
Fair value of acquired assets related to the properties acquired 2,060
In-Place Leases [Member] | Birmingham, AL [Member]  
Business Acquisition [Line Items]  
Fair value of acquired assets related to the properties acquired 458
Leasing Costs [Member]  
Business Acquisition [Line Items]  
Fair value of acquired assets related to the properties acquired 1,950
Leasing Costs [Member] | Richardson, TX [Member]  
Business Acquisition [Line Items]  
Fair value of acquired assets related to the properties acquired 1,804
Leasing Costs [Member] | Birmingham, AL [Member]  
Business Acquisition [Line Items]  
Fair value of acquired assets related to the properties acquired $ 146