Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Not Designated as Hedging Instrument - Fair Value, Measurements, Recurring - USD ($)	Dec. 31, 2018		Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Nominal volume	$ 659,100,000		$ 468,200,000
Less Than Six Months | Foreign Exchange Swaps
Derivatives, Fair Value [Line Items]
Nominal volume	659,100,000	[1]	468,200,000	[2]
Other current assets
Derivatives, Fair Value [Line Items]
Derivative asset	1,900,000		2,400,000
Other current assets | Less Than Six Months | Foreign Exchange Swaps
Derivatives, Fair Value [Line Items]
Derivative asset	1,900,000	[3]	2,400,000	[4]
Other current liabilities
Derivatives, Fair Value [Line Items]
Derivative liability	1,100,000		300,000
Other current liabilities | Less Than Six Months | Foreign Exchange Swaps
Derivatives, Fair Value [Line Items]
Derivative liability	$ 1,100,000	[5]	$ 300,000	[6]

[1] Net nominal amount after deducting for offsetting swaps under ISDA agreements is $659.1 million.

[2] Net nominal amount after deducting for offsetting swaps under ISDA agreements is $468.2 million.

[3] Net amount after deducting for offsetting swaps under ISDA agreements is $1.9 million.

[4] Net amount after deducting for offsetting swaps under ISDA agreements is $2.4 million.

[5] Net amount after deducting for offsetting swaps under ISDA agreements is $1.1 million.

[6] Net amount after deducting for offsetting swaps under ISDA agreements is $0.3 million.