Income Taxes - Deferred Income Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Gross deferred income tax assets:
NOL carryforwards	$ 287,516	$ 336,485
Basis difference – real estate properties	42,472	55,198
Basis difference – equity investments	445	5,448
Basis difference – intangibles	0	1,076
Section 163(j) interest limitation	480	4,771
Capital loss carryforward	1	1
Other – temporary differences	2,754	3,487
Total gross deferred income tax assets	333,668	406,466
Valuation allowance	(299,092)	(379,987)
Gross deferred income tax assets, net of valuation allowance	34,576	26,479
Gross deferred income tax liabilities:
Basis difference – real estate properties	78,113	69,157
Basis difference – equity investments	12,622	2,380
Other – temporary differences	1,898	2,941
Total gross deferred income tax liabilities	92,633	74,478
Net deferred income tax liabilities	$ 58,057	$ 47,999