Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Amount before tax of foreign currency transaction unrealized gain (loss) recognized in the income statement.

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Amount of gain (loss) recognized in earnings in the period from the increase (decrease) in fair value of foreign currency derivatives not designated as hedging instruments.

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Derivative Instruments - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2014 EUR (€)	Dec. 31, 2013 EUR (€)	Dec. 31, 2013 Prepaid and Other Current Assets USD ($)
Derivatives Fair Value [Line Items]
Foreign currency forward contracts, notional amount		$ 10,600,000invest_DerivativeNotionalAmount		€ 0invest_DerivativeNotionalAmount	€ 7,700,000invest_DerivativeNotionalAmount
Derivative Asset						372,000
Unrealized (gain) loss on foreign currency forward contracts	114,000	(261,000)	(51,000)
Foreign currency forward contracts recognized realized gain (loss)	$ 258,000	$ 60,000