Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense for intangible assets	$ 291,000	$ 136,000	$ 396,000	$ 319,000
Amortization expense for software	$ 51,000	$ 51,000	$ 169,000	$ 151,000