Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Income Tax Disclosure [Abstract]
Income tax expense	$ 2,913,000	$ 3,956,000	$ 2,972,000	$ 5,243,000
Effective income tax rate			41.30%	38.60%
Increase in the effective tax			$ 200,000