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Financial Instruments - Additional Information (Detail)
$ in Thousands, € in Millions
3 Months Ended 12 Months Ended
May 18, 2017
EUR (€)
Sep. 30, 2020
USD ($)
swap
Dec. 31, 2018
USD ($)
Mar. 31, 2016
USD ($)
Agreement
Mar. 31, 2016
EUR (€)
Agreement
Dec. 31, 2020
USD ($)
swap
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2019
swap
Derivatives, Fair Value [Line Items]                  
Gain on deal contingent derivatives           $ 0 $ 0 $ 12,505  
Derivative gains included in AOCI           4,100      
Proceeds from unwinding of cross currency swap derivative instruments           0 25,900 0  
Payments for (Proceeds from) Hedge, Investing Activities           (14,597) 0 $ (2,642)  
Derivative Liability, Fair Value, Gross Liability           29,203 7,415    
Forward Currency Contracts [Member]                  
Derivatives, Fair Value [Line Items]                  
Derivative instruments outstanding           220,804 473,600    
Currency Swap [Member]                  
Derivatives, Fair Value [Line Items]                  
Derivative instruments outstanding           300,000 600,000    
Payments for (Proceeds from) Hedge, Investing Activities   $ 14,600              
Interest Receivable   $ 2,200              
Derivative Liability, Fair Value, Gross Liability           23,409      
Interest Rate Swap [Member]                  
Derivatives, Fair Value [Line Items]                  
Loss incurred on termination of interest rate swaps       $ 3,200 € 2.9        
Gain on deal contingent derivatives | € € 5.3                
Number of interest rate derivatives held | Agreement       2 2        
Derivative Liability, Fair Value, Gross Liability             4,187    
Fair Value of Derivatives Not Designated as Hedging Instrument [Member]                  
Derivatives, Fair Value [Line Items]                  
Derivative Liability, Fair Value, Gross Liability           383 2,431    
Fair Value of Derivatives Not Designated as Hedging Instrument [Member] | Currency Swap [Member]                  
Derivatives, Fair Value [Line Items]                  
Derivative Liability, Fair Value, Gross Liability           0      
Fair Value of Derivatives Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]                  
Derivatives, Fair Value [Line Items]                  
Derivative Liability, Fair Value, Gross Liability             0    
Designated as Hedging Instrument [Member]                  
Derivatives, Fair Value [Line Items]                  
Derivative Liability, Fair Value, Gross Liability           $ 28,820 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   2       2     4
Proceeds from unwinding of cross currency swap derivative instruments     $ 33,600            
Derivative Liability, Fair Value, Gross Liability           $ 23,409      
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]                  
Derivatives, Fair Value [Line Items]                  
Derivative Liability, Fair Value, Gross Liability           $ 23,400 $ 4,187