Debt - Interest Expense (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Debt Instrument [Line Items]
Gross interest expense	$ 580,787	$ 500,019	$ 435,289
Amortization of discount (premium), net	(36,687)	228	47,136
Amortization of deferred loan costs	16,781	20,476	32,402
Interest expense, Gross	560,881	520,723	514,827
Capitalized amounts	(53,397)	(52,651)	(53,661)
Interest expense	$ 507,484	$ 468,072	$ 461,166