Derivative Financial Instruments - Summary of (Gain) Loss Reclassified From Accumulated Other Comprehensive Loss Earnings For Derivatives (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2017 USD ($)
Derivative Instruments Gain Loss [Line Items]
(Gain) loss on derivative hedging instruments	$ 19,692
Cross Currency Swap Agreements [Member] | Designated as Hedging Instrument [Member] | Other Non-operating (Income) Expense, Net [Member]
Derivative Instruments Gain Loss [Line Items]
(Gain) loss on derivative hedging instruments	11,867
Cross Currency Swap Agreements [Member] | Not Designated as Hedging Instrument [Member] | Other Non-operating (Income) Expense, Net [Member]
Derivative Instruments Gain Loss [Line Items]
(Gain) loss on derivative hedging instruments	$ 7,825