Derivative Instruments and Hedging Activities - Schedule of Pre-tax Effect of Derivative Financial Instruments on Unaudited Condensed Consolidated Statements of Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Derivatives in Cash Flow Hedging Relationships:
Gain (loss) related to effective portion of derivatives recognized in accumulated other comprehensive loss	$ 7,638	$ (18,621)
(Loss) gain related to effective portion of derivatives reclassified from accumulated other comprehensive loss to interest expense	$ (3,636)	834
Loss related to ineffective portion of derivatives recognized in other income, net		$ (1)