Goodwill and Intangible Assets - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Goodwill And Intangible Assets Disclosure [Abstract]
Change in carrying amount of goodwill			$ 0
Amortization expense	$ 34,000	$ 58,000	$ 67,000	$ 116,000