Income Taxes - Deferred Income Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Gross deferred income tax assets:
Net operating loss carryforwards	$ 611,027	$ 443,206
Basis difference - real estate properties	172,336	185,266
Basis difference - equity investments	13,163	20,008
Basis difference - intangibles	17,408	24,664
Alternative minimum tax credit carryforward	1,387	1,388
Foreign tax credit carryforward	1,963	1,944
Section 163(j) interest limitation	53,542	36,733
Capital loss carryforward	30,395
Other - temporary differences	16,746	14,784
Total gross deferred income tax assets	917,967	727,813
Valuation allowance	(859,305)	(641,064)
Gross deferred income tax assets, net of valuation allowance	58,662	86,749
Gross deferred income tax liabilities:
Basis difference - real estate properties	436,961	567,943
Built-in-gains - real estate properties	6,402	6,402
Basis difference - equity investments	958	1,118
Built-in-gains - equity investments	22,053	22,111
Basis difference - intangibles	10,591	9,742
Other - temporary differences	5,123	7,384
Total gross deferred income tax liabilities	482,088	614,700
Net deferred income tax liabilities	$ 423,426	$ 527,951