Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Effective tax rate provision (benefit)	128.70%		27.10%	71.00%	77.10%
Increase in provision for income taxes recognized	$ 73.2	$ 20.5		$ 52.7		$ 52.7