Derivative Financial Instruments - Summary of Fair Value Level 2 Inputs of Company's Derivatives (Detail) - Level 2 [Member] - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Derivative [Line Items]
Derivative liability	$ 14,902	$ 19,821
Designated as Hedging Instrument [Member] | Other Long-Term Liabilities [Member] | Cross Currency Swap Agreements [Member]
Derivative [Line Items]
Derivative liability	12,037	15,569
Designated as Hedging Instrument [Member] | Other Long-Term Assets [Member] | Interest Rate Swap Agreement [Member]
Derivative [Line Items]
Derivative assets	(711)	(345)
Not Designated as Hedging Instrument [Member] | Accruals and Other Liabilities [Member] | Cross Currency Swap Agreements [Member]
Derivative [Line Items]
Derivative liability	$ 3,576	$ 4,597