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Fair Value Measurement - Additional Information (Detail)
€ in Millions
3 Months Ended 9 Months Ended
Jun. 26, 2018
Jun. 18, 2018
EUR (€)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]              
Notes issued Jun. 26, 2018            
Notes issued price percentage 99.527%            
Notes stated percentage 0.75%            
Notes effective percentage 0.847%            
Eurobond              
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]              
Bond offering date   Jun. 18, 2018          
Bond term of period   5 years          
Bond price | €   € 500          
Not Designated as Hedging Instrument              
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]              
Derivatives designated as hedging instruments     $ 0   $ 0   $ 0
Gains and losses recognized in other non-operating items, net     $ 1,000,000 $ (900,000) $ (4,300,000) $ (500,000)