Debt - Interest Expense (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Debt Disclosure [Abstract]
Gross interest expense	$ 471,923	$ 578,518	$ 498,518
Amortization of discount (premium), net	(39,015)	(36,687)	228
Amortization of deferred loan costs	14,374	16,781	20,476
Interest expense before capitalization	447,282	558,612	519,222
Capitalized amounts	(67,955)	(53,397)	(52,651)
Net interest expense	379,327	505,215	466,571
Total cash paid for interest, net of amounts capitalized	$ 426,528	$ 546,627	$ 467,400