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Derivative Instruments - Information Regarding the Fair Value of the Forward Contracts Outstanding (Detail) (Currency Forward Contracts [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Accrued expenses [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives, Fair Value	$ 14	$ 165
Prepaid Expenses And Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	$ 44	$ 14

Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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- Definition

Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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