Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Provision for income tax	$ 1,940,000	$ 4,681,000
Income tax effective rate (as a percent)	112.90%	38.10%
Income tax effective rate excluding the impact of the charges related to the U.S. Government resolutions (as a percent)	73.90%	38.10%
Gross unrecognized tax benefit	700,000		700,000
Accrued interest and penalties related to unrecognized tax benefits	$ 500,000		$ 500,000