Quarterly report pursuant to Section 13 or 15(d)

Real Estate and Intangible Assets - Summary of Properties Acquired (Parenthetical) (Detail)

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Real Estate and Intangible Assets - Summary of Properties Acquired (Parenthetical) (Detail) (USD $)
In Thousands, unless otherwise specified
1 Months Ended 9 Months Ended
Nov. 30, 2005
Sep. 30, 2014
Sep. 30, 2013
Option
Dec. 31, 2013
Apr. 30, 2013
Real Estate [Abstract]          
Lease renewal terms description   The other tenants in the building have varying lease expirations from December 2015 to October 2018. No other tenants have renewal options.      
Total Purchase Price $ 5,300 $ 93,711 $ 108,888    
Total investment in property   $ 700,574   $ 642,353 $ 8,600
Renewal options period     5 years    
Renewal options     2    
Lease expiration year   2016-11 2021-08