Derivative Instruments and Hedging Strategies - Fair Value Carrying Amount of Derivatives (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Derivative [Line Items]
Derivative Asset, Fair Value	$ 52,863	$ 23,178
Derivative Liability, Fair Value	16,374	7,831
Level 2: | Derivatives Designated As Hedging Instruments
Derivative [Line Items]
Derivative Asset, Fair Value	52,792	23,010
Derivative Liability, Fair Value	15,516	7,689
Level 2: | Derivatives Designated As Hedging Instruments | Other current assets
Derivative [Line Items]
Derivative Asset, Fair Value	29,900	12,686
Level 2: | Derivatives Designated As Hedging Instruments | Other assets
Derivative [Line Items]
Derivative Asset, Fair Value	22,892	10,324
Level 2: | Derivatives Designated As Hedging Instruments | Accounts payable and accrued liabilities
Derivative [Line Items]
Derivative Liability, Fair Value	7,875	4,036
Level 2: | Derivatives Designated As Hedging Instruments | Other long-term liabilities
Derivative [Line Items]
Derivative Liability, Fair Value	7,641	3,653
Level 2: | Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative Asset, Fair Value	71	168
Derivative Liability, Fair Value	858	142
Level 2: | Not Designated as Hedging Instrument | Other current assets
Derivative [Line Items]
Derivative Asset, Fair Value	71	168
Level 2: | Not Designated as Hedging Instrument | Other assets
Derivative [Line Items]
Derivative Asset, Fair Value	0	0
Level 2: | Not Designated as Hedging Instrument | Accounts payable and accrued liabilities
Derivative [Line Items]
Derivative Liability, Fair Value	858	142
Level 2: | Not Designated as Hedging Instrument | Other long-term liabilities
Derivative [Line Items]
Derivative Liability, Fair Value	$ 0	$ 0