Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Tax Disclosure [Abstract]
Unrecognized tax benefits, interest expense			$ 0	$ 0
Effective income tax rate	117.90%	35.10%	34.10%	30.90%