Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Income Tax Disclosure [Abstract]
Income tax benefit	$ (1,780,000)		$ (59,000)
Effective tax rate	36.30%
Release of valuation allowance for deferred income taxes		$ 33,400,000