Financial Derivatives and Hedging Activities - Fair Values of Derivative Instruments (Detail) - Forward Foreign Currency Exchange Contracts [Member] - USD ($)	Sep. 30, 2015	Dec. 31, 2014
Designated as Hedging [Member] | Prepaid Expenses and Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value	$ 693,000	$ 3,106,000
Designated as Hedging [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liability, fair value	1,676,000	394,000
Not Designated as Hedging [Member] | Prepaid Expenses and Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value	91,000	70,000
Not Designated as Hedging [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liability, fair value	$ 0	$ 161,000