Derivative Instruments - Fair Value of Forward Contracts Outstanding (Detail) (Currency Forward Contracts [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Designated as Hedging Instruments [Member] | Cash Flow Hedge Forward Contracts [Member] | Prepaid Expenses and Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	$ 204
Designated as Hedging Instruments [Member] | Cash Flow Hedge Forward Contracts [Member] | Accrued Expenses [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives, Fair Value	98
Not Designated as Hedging Instruments [Member] | Economic Hedge Forward Contracts [Member] | Prepaid Expenses and Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	6	44
Not Designated as Hedging Instruments [Member] | Economic Hedge Forward Contracts [Member] | Accrued Expenses [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives, Fair Value	$ 24	$ 14