Fair Value of Financial Instruments - Summary of Fair Value Information of Financial Instruments (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Fair Value Disclosures [Abstract]
Interest and rent receivables, Book value	$ 54,554	$ 46,939
Loans, Book value	496,767	508,851
Debt, net Book value	(2,728,549)	(3,322,541)
Interest and rent receivables, Fair value	54,522	46,858
Loans, Fair value	529,053	543,859
Debt, net Fair value	$ (2,875,619)	$ (3,372,773)