Fair Value of Financial Instruments - Summary of Fair Value Information of Financial Instruments (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Interest and rent receivables, Book value	$ 46,939	$ 41,137
Loans, Book value	508,851	773,311
Debt, net Book value	(3,322,541)	(2,174,648)
Interest and rent receivables, Fair value	46,858	41,005
Loans, Fair value	543,859	803,824
Debt, net Fair value	$ (3,372,773)	$ (2,258,721)