Other Gain (Loss), Net - Additional Information (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Schedule of Available-for-sale Securities [Line Items]
Unrealized loss on foreign currency forward contracts	$ (88,000)	$ (167,000)
Gain recognized from the sale of available-for-sale securities		1,691,000
Other Gain (Loss), Net [Member]
Schedule of Available-for-sale Securities [Line Items]
Unrealized loss on foreign currency forward contracts	(88,000)	(167,000)
Net foreign currency transaction gains	$ 65,000
Gain recognized from the sale of available-for-sale securities		1,691,000
Dividend received from investments in available-for-sale securities		$ 11,000