Income Taxes (Narrative) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Mar. 31, 2014
Income Tax Disclosure [Abstract]
Federal statutory income tax rate (in Percent)			35.00%
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions			$ 2.4
Release of tax reserve against federal tax credits taken in prior years	$ 3.9	$ 6.5