Basis of Presentation - Additional Information (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) Segment	Sep. 30, 2014 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of operating segments			2
Net foreign exchange gains (losses) resulting from foreign currency transactions included in other income | $	$ 5	$ 10	$ (23)	$ (37)