Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Provision for income tax	$ 4,763,000	$ 383,000	$ 9,251,000	$ 7,993,000
Income tax effective rate (as a percent)			87.30%	(1397.30%)
Income tax effective rate excluding the impact of the charges related to the U.S. Government resolutions (as a percent)			68.40%	(1422.40%)
Gross unrecognized tax benefit	700,000		700,000		700,000
Accrued interest and penalties related to unrecognized tax benefits	$ 500,000		$ 500,000		$ 500,000