Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring - USD ($)		Jun. 30, 2017		Dec. 31, 2016
Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Nominal volume	[1]	$ 43,700,000		$ 84,800,000
Derivative Asset	[1]	2,100,000		7,600,000
Derivative Liability	[1]	1,000,000		500,000
Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Nominal volume		397,400,000		251,800,000
Derivative Asset		2,900,000		1,100,000
Derivative Liability		1,500,000		100,000
Less Than One Year | Designated as Hedging Instrument | Foreign Exchange Forward | Cash Flow Hedging
Derivatives, Fair Value [Line Items]
Nominal volume	[1]	43,700,000		74,000,000
Less Than One Year | Other current assets | Designated as Hedging Instrument | Foreign Exchange Forward | Cash Flow Hedging
Derivatives, Fair Value [Line Items]
Derivative Asset	[1]	2,100,000		7,600,000
Less Than One Year | Other current liabilities | Designated as Hedging Instrument | Foreign Exchange Forward | Cash Flow Hedging
Derivatives, Fair Value [Line Items]
Derivative Liability	[1]	1,000,000		300,000
Less Than Two Years | Designated as Hedging Instrument | Foreign Exchange Forward | Cash Flow Hedging
Derivatives, Fair Value [Line Items]
Nominal volume	[1]	0		10,800,000
Less Than Two Years | Other Non-Current Asset | Designated as Hedging Instrument | Foreign Exchange Forward | Cash Flow Hedging
Derivatives, Fair Value [Line Items]
Derivative Asset	[1]	0		0
Less Than Two Years | Other Non-Current Liabilities | Designated as Hedging Instrument | Foreign Exchange Forward | Cash Flow Hedging
Derivatives, Fair Value [Line Items]
Derivative Liability	[1]	0		200,000
Less Than Six Months | Not Designated as Hedging Instrument | Foreign Exchange Swaps
Derivatives, Fair Value [Line Items]
Nominal volume		397,400,000	[2]	251,800,000	[3]
Less Than Six Months | Other current assets | Not Designated as Hedging Instrument | Foreign Exchange Swaps
Derivatives, Fair Value [Line Items]
Derivative Asset		2,900,000	[4]	1,100,000	[5]
Less Than Six Months | Other current liabilities | Not Designated as Hedging Instrument | Foreign Exchange Swaps
Derivatives, Fair Value [Line Items]
Derivative Liability		$ 1,500,000	[6]	$ 100,000	[7]

[1] There is no netting since there are no offsetting contracts.

[2] Net nominal amount after deducting for offsetting swaps under ISDA agreements is $397.4 million.

[3] Net nominal amount after deducting for offsetting swaps under ISDA agreements is $226.5 million.

[4] Net amount after deducting for offsetting swaps under ISDA agreements is $2.9 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 $1.5 million.

[7] Net amount after deducting for offsetting swaps under ISDA agreements is $0.0 million.