Income Taxes (Narrative) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Company's effective tax rate	27.50%	30.10%	30.60%	30.40%
Federal statutory income tax rate			35.00%
Increase in gross unrecognized tax benefits	$ 1.5		$ 5.8
Increase in total amount of unrecognized tax benefits, would impact effective tax rate	1.4		5.9
Recognized interest expense related to unrecognized tax benefits	0.3		0.7
Interest and penalty related to unrecognized tax benefits recorded	$ 4.7		$ 4.7		$ 4.0