Derivative Instruments - Additional Information (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2014 USD ($)	Sep. 30, 2013 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2013 USD ($)	Sep. 30, 2014 EUR (€)	Dec. 31, 2013 USD ($)	Dec. 31, 2013 EUR (€)	Sep. 30, 2014 Accrued And Other Liabilities USD ($)	Dec. 31, 2013 Prepaid and Other Current Assets USD ($)
Derivatives Fair Value [Line Items]
Foreign currency forward contracts, notional amount	$ 1,400,000		$ 1,400,000		€ 1,100,000	$ 10,600,000	€ 7,700,000
Derivative Liability								68,000
Derivative Asset									372,000
Unrealized (gain) loss on foreign currency forward contracts	113,000	(450,000)	114,000	(97,000)
Foreign currency forward contracts recognized realized gain (loss)	$ (75,000)	$ 45,000	$ (326,000)	$ 118,000