Derivative Instruments and Hedging Strategies - Fair Value Carrying Amount of Derivatives (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Derivative [Line Items]
Derivative Asset, Fair Value	$ 29,405	$ 23,178
Derivative Liability, Fair Value	11,411	7,831
Level 2: | Derivatives Designated As Hedging Instruments
Derivative [Line Items]
Derivative Asset, Fair Value	28,791	23,010
Derivative Liability, Fair Value	10,238	7,689
Level 2: | Derivatives Designated As Hedging Instruments | Other current assets
Derivative [Line Items]
Derivative Asset, Fair Value	15,577	12,686
Level 2: | Derivatives Designated As Hedging Instruments | Other assets
Derivative [Line Items]
Derivative Asset, Fair Value	13,214	10,324
Level 2: | Derivatives Designated As Hedging Instruments | Accounts payable and accrued liabilities
Derivative [Line Items]
Derivative Liability, Fair Value	5,250	4,036
Level 2: | Derivatives Designated As Hedging Instruments | Other long-term liabilities
Derivative [Line Items]
Derivative Liability, Fair Value	4,988	3,653
Level 2: | Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative Asset, Fair Value	614	168
Derivative Liability, Fair Value	1,173	142
Level 2: | Not Designated as Hedging Instrument | Other current assets
Derivative [Line Items]
Derivative Asset, Fair Value	614	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	1,173	142
Level 2: | Not Designated as Hedging Instrument | Other long-term liabilities
Derivative [Line Items]
Derivative Liability, Fair Value	$ 0	$ 0