Derivative Instruments and Hedging Activities - Schedule of Pre-tax Effect of Derivative Financial Instruments on Unaudited Condensed Consolidated Statements of Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Derivatives in Cash Flow Hedging Relationships:
Gain (loss) related to effective portion of derivatives recognized in accumulated other comprehensive loss	$ 6,298	$ 1,612	$ 16,066	$ (25,276)
(Loss) gain related to effective portion of derivatives reclassified from accumulated other comprehensive loss to interest expense	$ (2,957)	$ 880	$ (9,897)	2,546
Loss related to ineffective portion of derivatives recognized in other (income) expense, net				$ (1)