Income Tax Provision - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Tax Disclosure [Abstract]
Effective income tax rates	38.90%	36.50%	38.20%	36.70%
Federal income tax rate			35.00%
Income tax payments			$ 25.0	$ 27.2