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Derivative Financial Instruments - Summary of Euro Equivalent the Contractual Amounts of forward Exchange Contracts (Detail) - Forward exchange contract [member] - EUR (€)
€ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2017
Disclosure Of Derivative Financial Instruments [line items]      
Notional amount € 43,645 € 49,627 € 67,540
U.S. dollars [member]      
Disclosure Of Derivative Financial Instruments [line items]      
Notional amount 14,528 21,979 26,670
Euro [member]      
Disclosure Of Derivative Financial Instruments [line items]      
Notional amount 11,407 10,226 13,925
British pounds [member]      
Disclosure Of Derivative Financial Instruments [line items]      
Notional amount 10,612 11,137 15,860
Japanese yen [member]      
Disclosure Of Derivative Financial Instruments [line items]      
Notional amount 2,318 1,692 2,117
Australian dollars [member]      
Disclosure Of Derivative Financial Instruments [line items]      
Notional amount 2,129 2,294 2,964
Canadian dollars [member]      
Disclosure Of Derivative Financial Instruments [line items]      
Notional amount 1,300 1,338 4,965
Danish kroner [member]      
Disclosure Of Derivative Financial Instruments [line items]      
Notional amount 1,086 713 618
Swedish kroner [member]      
Disclosure Of Derivative Financial Instruments [line items]      
Notional amount € 265 € 248 € 421