Derivative Instruments - Additional Information (Detail)	3 Months Ended		6 Months Ended
	Jun. 30, 2014 USD ($)	Jun. 30, 2013 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2013 USD ($)	Jun. 30, 2014 EUR (€)	Dec. 31, 2013 USD ($)	Dec. 31, 2013 EUR (€)	Jun. 30, 2014 Prepaid Expenses and Other Current Assets USD ($)	Dec. 31, 2013 Prepaid Expenses and Other Current Assets USD ($)
Derivatives Fair Value [Line Items]
Foreign currency forward contracts, notional amount	$ 3,800,000		$ 3,800,000		€ 2,800,000	$ 10,600,000	€ 7,700,000
Derivative assets								121,000	372,000
Foreign currency forward contracts unrealized gain (loss)	(18,000)	182,000	(1,000)	(352,000)
Foreign currency forward contracts recognized realized gain (loss)	$ (107,000)	$ 83,000	$ (250,000)	$ 73,000