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Debt - Additional Information (Detail)
€ in Millions, $ in Millions
3 Months Ended
Mar. 31, 2018
USD ($)
Mar. 31, 2018
EUR (€)
Mar. 31, 2017
USD ($)
Debt Instrument [Line Items]      
Draws on credit facility $ 310   $ 340
Revolver      
Debt Instrument [Line Items]      
Line of credit facility remaining borrowing capacity 511    
Revolver | Tranche One      
Debt Instrument [Line Items]      
Draws on credit facility 150    
Revolver | Tranche Two      
Debt Instrument [Line Items]      
Draws on credit facility $ 160 € 130