Derivative Instruments and Hedging Activities - Earnings Effect of Derivative Instruments in Condensed Consolidated Statements of Operations and Condensed Consolidated Statements of Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Classification of Gain (Loss) Recognized	$ 1,778	$ (4,924)
Cash Flow Hedges [Member] | Interest Rate Swap [Member] | Other Comprehensive Income (Loss) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Classification of Gain (Loss) Recognized	$ 1,778	$ (4,924)