Fair Value of Financial Instruments - Summary of Fair Value Information of Financial Instruments (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Fair Value Disclosures [Abstract]
Interest and rent receivables, Book value	$ 61,912	$ 57,698
Loans, Book value	985,570	986,987
Debt, net Book value	(3,277,986)	(2,909,341)
Interest and rent receivables, Fair value	61,941	57,707
Loans, Fair value	1,018,548	1,017,428
Debt, net Fair value	$ (3,372,482)	$ (2,966,759)