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Financial Instruments - Additional Information (Detail)
$ in Thousands, € in Millions
3 Months Ended 12 Months Ended
May 18, 2017
EUR (€)
Mar. 31, 2017
EUR (€)
Agreement
Mar. 31, 2017
USD ($)
Agreement
Jun. 30, 2013
USD ($)
Mar. 31, 2013
Agreement
Dec. 31, 2018
USD ($)
contract
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Derivatives, Fair Value [Line Items]                
Number of interest rate swap agreements | Agreement         3      
Loss incurred on termination of interest rate swaps       $ 2,700        
Gain on deal contingent derivatives           $ 12,505 $ 0 $ 0
Derivative gains included in AOCI           7,500    
Total fair value, derivative assets           $ 7,229    
Forward Currency Contracts [Member]                
Derivatives, Fair Value [Line Items]                
Number of multiple forward currency contracts matured | contract           4    
Derivative instruments outstanding           $ 585,581 896,947  
Currency Swap [Member]                
Derivatives, Fair Value [Line Items]                
Derivative instruments outstanding           1,087 0  
Total fair value, derivative assets           1,087    
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          
Derivative instruments outstanding           0 150,000  
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    
Fair Value of Derivatives Not Designated as Hedging Instrument [Member] | Currency Swap [Member]                
Derivatives, Fair Value [Line Items]                
Total fair value, derivative assets           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           14,505 (10,057)  
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           12,154 0  
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           $ 352 $ 0