Income Taxes - Deferred Income Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Gross deferred income tax assets:
Net operating loss carryforwards	$ 321,144	$ 346,978
Basis difference – real estate properties	89,856	105,205
Basis difference – equity investments	11,242	12,401
Basis difference – intangibles	4,351	5,952
Section 163(j) interest limitation	32,684	32,703
Capital loss carryforward	25,282	25,282
Other – temporary differences	8,993	10,701
Total gross deferred income tax assets	493,552	539,222
Valuation allowance	(467,440)	(518,241)
Gross deferred income tax assets, net of valuation allowance	26,112	20,981
Gross deferred income tax liabilities:
Basis difference – real estate properties	82,160	89,998
Basis difference – intangibles	6,170	7,324
Other – temporary differences	993	716
Total gross deferred income tax liabilities	89,323	98,038
Net deferred income tax liabilities	$ 63,211	$ 77,057