Income Taxes - Deferred Income Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Gross deferred income tax assets:
Net operating loss carryforwards	$ 350,909	$ 321,144
Basis difference – real estate properties	56,827	89,856
Basis difference – equity investments and intangibles	4,666	15,593
Section 163(j) interest limitation	40,766	32,684
Capital loss carryforward	25,145	25,282
Other – temporary differences	5,578	8,993
Total gross deferred income tax assets	483,891	493,552
Valuation allowance	(456,699)	(467,440)
Gross deferred income tax assets, net of valuation allowance	27,192	26,112
Gross deferred income tax liabilities:
Basis difference – real estate properties	70,914	82,160
Basis difference – equity investments and intangibles	6,864	6,170
Other – temporary differences	1,028	993
Total gross deferred income tax liabilities	78,806	89,323
Net deferred income tax liabilities	$ 51,614	$ 63,211