Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Taxes [Line Items]
Provision (benefit) for income taxes	$ 1,738,000	$ 278,000	$ 2,535,000	$ 433,000
Effective income tax rate	3.79%	0.75%	11.93%	1.16%
Provision (benefit) for income taxes			44,000	1,400,000
Discrete tax expense resulting from a State tax Audit			$ 15,000