Derivative Instruments - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2014 USD ($)	Mar. 31, 2013 USD ($)	Mar. 31, 2014 EUR (€)	Dec. 31, 2013 USD ($)	Dec. 31, 2013 EUR (€)	Mar. 31, 2014 Prepaid Expenses and Other Current Assets USD ($)	Dec. 31, 2013 Prepaid Expenses and Other Current Assets USD ($)
Derivatives Fair Value [Line Items]
Foreign currency forward contracts, notional amount	$ 6,700,000		€ 4,900,000	$ 10,600,000	€ 7,700,000
Derivative assets						245,000	372,000
Foreign currency forward contracts unrealized gain (loss)	17,000	(534,000)
Foreign currency forward contracts recognized realized gain (loss)	$ (143,000)	$ (10,000)