Fair Value Measurement of Assets and Liabilities - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency exchange forward contracts outstanding	$ 0	$ 0
Euro-denominated foreign exchange forward contracts gain	0	0	8,000
Foreign currency losses on foreign currency denominated transactions	$ 183,000	$ 51,000	$ 836,000
Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long term marketable debt securities maturity period	1 year
Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long term marketable debt securities maturity period	2 years