Quarterly report pursuant to Section 13 or 15(d)

Real Estate and Intangible Assets - Additional Information (Detail)

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Real Estate and Intangible Assets - Additional Information (Detail)
$ in Thousands
 3 Months Ended 6 Months Ended
Apr. 29, 2015
USD ($)
Apr. 28, 2015
USD ($)
Jun. 30, 2015
USD ($)
Property
Jun. 30, 2014
USD ($)
Property
Jun. 30, 2015
USD ($)
Property
Jun. 30, 2014
USD ($)
Property
Dec. 31, 2014
USD ($)
Real Estate Properties [Line Items]              
Number of properties acquired | Property     4 6 4 6  
Tenant improvements     $ 46,959   $ 46,959   $ 41,016
Total amortization expense related to lease intangible assets     3,400 $ 2,300 6,400 $ 4,700  
Amortization related to below-market lease     200 200 400 300  
Building And Tenant Improvements [Member]              
Real Estate Properties [Line Items]              
Real estate depreciation expense     5,500 4,600 10,700 9,000  
Above Market Leases [Member]              
Real Estate Properties [Line Items]              
Amortization related to above-market lease     $ 100 $ 100 $ 200 $ 100  
Austin, Texas [Member]              
Real Estate Properties [Line Items]              
Early termination penalty   $ 1,100          
Effective termination date         Dec. 31, 2017    
Lease termination description         Termination option, which allows the tenant to terminate its lease effective December 31, 2017, upon paying a termination penalty of approximately $1.1 million on or before March 31, 2017. The lease is scheduled to otherwise terminate in June 2022. As a result of the modification, the tenant forfeited its right to $0.5 million in tenant improvement allowance, provided in an earlier amendment. All other terms and conditions of the lease remain in full force and effect.    
Forfeiture of tenant improvement allowance   $ 500          
Extended lease expiration         2022-06    
Columbus, OH [Member]              
Real Estate Properties [Line Items]              
Percentage of property occupied by tenant 92.00%            
Effective termination date         2023-12    
Tenant improvements $ 100