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Derivative Instruments - Additional Information (Detail)	3 Months Ended	6 Months Ended		12 Months Ended
	Jun. 30, 2012 USD ($)	Jun. 30, 2013 USD ($)	Jun. 30, 2012 USD ($)	Dec. 31, 2012 USD ($)	Jun. 30, 2013 Foreign currency forward contracts Sale Contract USD ($)	Jun. 30, 2013 Foreign currency forward contracts Sale Contract EUR (€)	Dec. 31, 2012 Foreign currency forward contracts Sale Contract USD ($)	Dec. 31, 2012 Foreign currency forward contracts Sale Contract EUR (€)	Jun. 30, 2013 Accrued Liabilities USD ($)	Jun. 30, 2013 Other Noncurrent Liabilities USD ($)	Dec. 31, 2012 Prepaid Expenses and Other Current Assets USD ($)	Dec. 31, 2012 Other Long Lived Assets USD ($)
Derivatives, Fair Value [Line Items]
Notional amount of derivatives					$ 15,600,000	€ 12,000,000	$ 22,200,000	€ 16,800,000
Derivative assets											30,000	21,000
Foreign currency forward contracts unrealized gain (loss)		(352,000)		51,000
Derivative liabilities									175,000	53,000
Foreign currency forward contracts realized gain	$ 0	$ 73,000	$ 0

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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- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or 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.

+ References+ Details