Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Provision for income tax	$ 3,309,000	$ 3,246,000	$ 4,488,000	$ 7,610,000
Income tax effective rate (as a percent)			77.30%	48.90%
Income tax effective rate excluding the impact of the charges related to the U.S. Government resolutions (as a percent)			63.20%	48.80%
Gross unrecognized tax benefit	800,000		800,000		800,000
Accrued interest and penalties related to unrecognized tax benefits	$ 500,000		$ 500,000		$ 500,000