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Financial Instruments - Additional Information (Detail)
€ in Millions
3 Months Ended 9 Months Ended
May 18, 2017
EUR (€)
Sep. 30, 2017
EUR (€)
contract
Sep. 30, 2017
USD ($)
contract
Sep. 30, 2017
USD ($)
contract
Sep. 30, 2016
swap
Derivative [Line Items]          
Derivative losses included in AOCI     $ 5,400,000    
Net investment hedge ineffectiveness     0 $ 0  
Cash flow hedge ineffectiveness     $ 0 $ 0  
Foreign Exchange Forward [Member]          
Derivative [Line Items]          
Term of derivative       12 months  
Interest rate swaps [Member]          
Derivative [Line Items]          
Number of derivatives (swap) | swap         2
Number of instruments terminated (swap) | swap         2
Loss on settlement of derivatives € (5.3) € (2.9)   $ 3,200,000  
Net Investment Hedging [Member] | Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member]          
Derivative [Line Items]          
Remaining maturity term       1 year  
Number of derivatives matured (contract) | contract   14 14 14