Income Taxes (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2013 States	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Line Items]
Net operating loss carryforwards	$ 117.5
Continuing operations effective income tax rate	(38.30%)	(17.40%)	(21.50%)
Uncertain tax benefits accrued	3.9	0.4	0
Interest and penalties accrued related to uncertain income tax positions	$ 0.1
Number of individual states subject to income taxes	50
Minimum [Member]
Income Tax Disclosure [Line Items]
Tax years open to examination	2001
Maximum [Member]
Income Tax Disclosure [Line Items]
Tax years open to examination	2013

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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This element represents the total of accruals as of the date of the statement of financial position for interest recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity and the amount of statutory penalties for a tax position claimed or expected to be claimed by the entity, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties.

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