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Financial Instruments - Additional Information (Detail) $ in Thousands, € in Millions |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
May 18, 2017 EUR (€) | Dec. 31, 2018 USD ($) | Mar. 31, 2017 EUR (€) Agreement | Mar. 31, 2017 USD ($) Agreement | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2019 swap
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |
Gain on deal contingent derivatives |  |  |  |  | $ 0 | $ 12,505 | $ 0 |
Derivative gains included in AOCI |  |  |  |  | 4,700 |  |  |
Total fair value, derivative assets |  | $ 7,229 |  |  |  | 7,229 |  |
Proceeds from unwinding of cross currency swap derivative instruments |  |  |  |  | 25,900 | 0 | $ 0 |
Derivative Liability, Fair Value, Gross Liability |  |  |  |  | 7,415 |  |  |
Forward Currency Contracts [Member] |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |
Derivative instruments outstanding |  | 585,581 |  |  | 473,600 | 585,581 |  |
Currency Swap [Member] |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |
Derivative instruments outstanding |  | 600,000 |  |  | 600,000 | 600,000 |  |
Interest Rate Swap [Member] |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |
Loss incurred on termination of interest rate swaps |  |  | € 2.9 | $ 3,200 |  |  |  |
Gain on deal contingent derivatives | € | € 5.3 |  |  |  |  |  |  |
Number of interest rate derivatives held | Agreement |  |  | 2 | 2 |  |  |  |
Total fair value, derivative assets |  | 1,087 |  |  |  | 1,087 |  |
Derivative Liability, Fair Value, Gross Liability |  |  |  |  | 4,187 |  |  |
Foreign Currency Contract And Interest Rate Swap [Member] |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |
Derivative instruments outstanding |  |  |  |  | 1,900,000 |  |  |
Fair Value of Derivatives Not Designated as Hedging Instrument [Member] |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |
Total fair value, derivative assets |  | 2,020 |  |  |  | 2,020 |  |
Derivative Liability, Fair Value, Gross Liability |  |  |  |  | 2,431 |  |  |
Fair Value of Derivatives Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |
Total fair value, derivative assets |  | 0 |  |  |  | 0 |  |
Derivative Liability, Fair Value, Gross Liability |  |  |  |  | 0 |  |  |
Fair Value of Derivatives Not Designated as Hedging Instrument [Member] | Foreign Currency Contracts [Member] |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |
Amount of gain or (loss) on derivative |  |  |  |  | 557 | 14,505 |  |
Designated as Hedging Instrument [Member] |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |
Total fair value, derivative assets |  | 5,209 |  |  |  | 5,209 |  |
Derivative Liability, Fair Value, Gross Liability |  |  |  |  | 4,984 |  |  |
Designated as Hedging Instrument [Member] | Currency Swap [Member] |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |
Interest Income (Expense), Net |  | 7,700 |  |  |  |  |  |
Number of Foreign Currency Derivatives Held | swap |  |  |  |  |  |  |  | 4
Proceeds from unwinding of cross currency swap derivative instruments |  | 33,600 |  |  |  |  |  |
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |
Total fair value, derivative assets |  | $ 1,087 |  |  |  | 1,087 |  |
Derivative Liability, Fair Value, Gross Liability |  |  |  |  | 4,187 |  |  |
Other Income Expense Net [Member] | Deal Contingent Swaps [Member] | Fair Value of Derivatives Not Designated as Hedging Instrument [Member] | Foreign Currency Contracts [Member] |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |
Amount of gain or (loss) on derivative |  |  |  |  | 0 | 12,154 |  |
Interest Expense [Member] | Deal Contingent Swaps [Member] | Fair Value of Derivatives Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |
Amount of gain or (loss) on derivative |  |  |  |  | $ 0 | $ 352 |  |

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