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Acquisitions - Consideration (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Business Combinations [Abstract]      
Cash (including debt repaid at closing) $ 169,805 $ 330,929  
Gain on Change in Control of Interests 14,279 4,296  
Carrying value of previously held equity interest 1,401 2,449  
Repayment of preferred equity interest and mezzanine loan 0 51,775 $ 160,100
Issuance of OP Units 0 18,256  
Total consideration $ 185,485 $ 407,705