Quarterly report pursuant to Section 13 or 15(d)

Real Estate and Intangible Assets - Additional Information (Detail)

v2.4.0.8
Real Estate and Intangible Assets - Additional Information (Detail) (USD $)
 0 Months Ended 6 Months Ended 0 Months Ended 6 Months Ended 0 Months Ended 6 Months Ended 6 Months Ended
Jun. 11, 2014
Jun. 30, 2014
Property
Jun. 30, 2013
May 06, 2014
Austin, Texas [Member]
Jun. 30, 2014
Austin, Texas [Member]
Jun. 11, 2014
Burnsville, Minnesota [Member]
Jun. 30, 2014
Newburyport, Massachusetts [Member]
Jun. 30, 2014
2014 Real Estate Activity [Member]
Property
Jun. 30, 2013
2013 Real Estate Activity [Member]
Property
Real Estate Properties [Line Items]                  
Number of properties acquired   6           6 3
Number of properties expanded                 1
Lease expiration date             Apr. 30, 2015    
Option to extend lease term       8 years          
Original lease expiration       2015-06          
Extended lease expiration       2022-06          
Amount of annualized straight line rents over the life of the lease       $ 700,000          
Leasing commission pay   765,000 394,000   200,000        
Tenant improvements payable   3,300,000     1,300,000        
Extended additional period of lease 3 years         8 years      
Extended lease expiration date           2023-01      
Lease expiration period, month and year           2015-06      
Annualized straight line rent escalations           $ 1,000,000      
Annual increase in lease rental 14.00%