Derivative Financial Instruments - Summary of Fair Value Level 2 Inputs of Company's Derivatives (Detail) - Level 2 [Member] - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Derivative liability	$ 19,821	$ 2,531
Designated as Hedging Instrument [Member] | Other Long-Term Liabilities [Member] | Cross Currency Swap Agreements [Member]
Derivative [Line Items]
Derivative liability	15,569	1,642
Designated as Hedging Instrument [Member] | Other Long-Term Assets [Member] | Cross Currency Swap Agreements [Member]
Derivative [Line Items]
Derivative assets	345
Not Designated as Hedging Instrument [Member] | Other Long-Term Liabilities [Member] | Cross Currency Swap Agreements [Member]
Derivative [Line Items]
Derivative liability	$ 4,597	$ 889