Hedging Activities - Schedule of Derivative Financial Instruments in Condensed Consolidated Balance Sheet (Detail) - Designated as Hedging Instrument [Member] - Interest Rate Swaps [Member] - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Derivatives Fair Value [Line Items]
Total derivatives designated as hedging instruments	$ 11,824	$ 14,172
Other Current Assets [Member]
Derivatives Fair Value [Line Items]
Total derivatives designated as hedging instruments	1,014	0
Other Long-Term Assets [Member]
Derivatives Fair Value [Line Items]
Total derivatives designated as hedging instruments	11,003	14,528
Accrued Expenses [Member]
Derivatives Fair Value [Line Items]
Total derivatives designated as hedging instruments	$ (193)	$ (356)