Derivative Instruments - Fair Values of Derivative Instrument and Respective Classification in Condensed Consolidated Balance Sheets (Detail) - Interest Rate Swap Agreements [Member] - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Derivatives Fair Value [Line Items]
Derivative, fair value	$ (12,629)	$ (14,449)
Designated as Cash Flow Hedges [Member] | Other Long-Term Liabilities [Member]
Derivatives Fair Value [Line Items]
Derivative liabilities	$ (12,629)	(14,488)
Designated as Cash Flow Hedges [Member] | Other Assets [Member]
Derivatives Fair Value [Line Items]
Derivative assets		$ 39