Fair Value of Financial Instruments - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]
Maturities of forward contracts	12 months
Effective portion of change in fair value of foreign currency forward contracts	$ 5,719	$ 398
Foreign Exchange Contracts [Member]
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]
Notional amount of the foreign currency derivative instruments	$ 170,750	$ 148,036