Debt - Interest Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Debt Disclosure [Abstract]
Gross interest expense	$ 394,012	$ 377,666	$ 471,923
Amortization of premium, net	(45,253)	(21,440)	(39,015)
Amortization of deferred loan costs	13,412	14,116	14,374
Interest expense before capitalization	362,171	370,342	447,282
Capitalized amounts	(60,808)	(61,457)	(67,955)
Net interest expense	301,363	308,885	379,327
Total cash paid for interest, net of amounts capitalized	$ 345,916	$ 258,441	$ 426,528