Derivatives - Additional Information (Detail) (Foreign Currency Forward Contracts, USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Cash Flow Hedge
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional value of derivatives	$ 35,200
Contract maturity period	One year or less
Contract expiring terms	2015-08
Foreign currency forward contracts designated as cash flow hedges		0
Pre-tax gain to be reclassified into earnings within the next 12 months	2,423
Derivatives not Designated as Hedging Instruments
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional value of derivatives	14,400
Contract expiring terms	2015-10
Gain (loss) from foreign currency forward contracts not designated as hedging instruments	$ 1,383	$ 76