Derivative Instruments and Hedging Strategies - Summary of Derivatives Designated as Hedging Instruments Outstanding (Detail) - Derivatives Designated As Hedging Instruments - Foreign exchange contracts € in Millions, kr in Millions, R$ in Millions, $ in Millions, $ in Millions, $ in Millions	6 Months Ended
	Jun. 30, 2019 NOK (kr) Derivative	Jun. 30, 2019 EUR (€) Derivative	Jun. 30, 2019 BRL (R$) Derivative	Jun. 30, 2019 COP ($) Derivative	Jun. 30, 2019 AUD ($) Derivative	Jun. 30, 2019 CAD ($) Derivative
Derivative [Line Items]
Number of Contracts	665	665	665	665	665	665
Australian Dollars | Sell
Derivative [Line Items]
Number of Contracts	12	12	12	12	12	12
Aggregate Notional Amount in Foreign Currency | $					$ 5.6
Australian Dollars | Minimum | Sell
Derivative [Line Items]
Maturity	Jul. 31, 2019
Australian Dollars | Maximum | Sell
Derivative [Line Items]
Maturity	Dec. 31, 2019
Brazilian Reais | Sell
Derivative [Line Items]
Number of Contracts	3	3	3	3	3	3
Aggregate Notional Amount in Foreign Currency | R$			R$ 40.4
Maturity	Aug. 31, 2019
Canadian Dollars | Sell
Derivative [Line Items]
Number of Contracts	12	12	12	12	12	12
Aggregate Notional Amount in Foreign Currency | $						$ 17.9
Canadian Dollars | Minimum | Sell
Derivative [Line Items]
Maturity	Jul. 31, 2019
Canadian Dollars | Maximum | Sell
Derivative [Line Items]
Maturity	Dec. 31, 2019
Colombian Pesos | Sell
Derivative [Line Items]
Number of Contracts	12	12	12	12	12	12
Aggregate Notional Amount in Foreign Currency | $				$ 98,000.0
Colombian Pesos | Minimum | Sell
Derivative [Line Items]
Maturity	Jul. 31, 2019
Colombian Pesos | Maximum | Sell
Derivative [Line Items]
Maturity	Jun. 30, 2020
Euros | Sell
Derivative [Line Items]
Number of Contracts	466	466	466	466	466	466
Aggregate Notional Amount in Foreign Currency | €		€ 572.6
Euros | Purchase
Derivative [Line Items]
Number of Contracts	154	154	154	154	154	154
Aggregate Notional Amount in Foreign Currency | €		€ 194.0
Euros | Minimum | Sell
Derivative [Line Items]
Maturity	Jul. 31, 2019
Euros | Minimum | Purchase
Derivative [Line Items]
Maturity	Jul. 31, 2019
Euros | Maximum | Sell
Derivative [Line Items]
Maturity	Jun. 30, 2022
Euros | Maximum | Purchase
Derivative [Line Items]
Maturity	Jun. 30, 2022
Norwegian Krone | Sell
Derivative [Line Items]
Number of Contracts	6	6	6	6	6	6
Aggregate Notional Amount in Foreign Currency | kr	kr 23.4
Norwegian Krone | Minimum | Sell
Derivative [Line Items]
Maturity	Jul. 31, 2019
Norwegian Krone | Maximum | Sell
Derivative [Line Items]
Maturity	Dec. 31, 2019