Debt Facilities - Interest Charges (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Debt Disclosure [Abstract]
Interest expense	$ 118,674	$ 130,566	$ 362,067	$ 391,516
Interest capitalized	8,424	6,206	24,188	13,004
Interest charges incurred	127,098	136,772	386,255	404,520
Interest paid, net of capitalized interest	$ 144,800	$ 146,700	$ 388,500	$ 362,000