Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Income tax benefit	$ (15.7)	$ (13.6)
Effective income tax rate, continuing operations (as a percent)	44.90%	48.10%
Expected effective tax rate	35.00%	35.00%
Valuation allowance on deferred tax assets	$ 71.1		$ 67.6