Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$ 19,872		$ 19,872		$ 12,049
Amortization expense of intangible assets	215	$ 75	$ 454	$ 226
Expiration of amortization			Various times through 2020
Amortization from capitalized internally developed software	$ 44	$ 53	$ 145	$ 160