Income Taxes - Details of Reconciliation of Income Taxes (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Tax Disclosure [Abstract]
Income from continuing operations before income taxes	$ 5.8	$ 3.6	$ 11.3	$ 6.2
Federal taxes at statutory rate			4.0
State taxes at statutory rate			0.2
Nondeductible items			0.1
Change in valuation allowance	(21.7)		(21.7)
Income tax benefit from continuing operations	$ (17.4)		$ (17.4)	$ 0.0
Federal taxes at statutory rate, percentage			35.00%
State taxes at statutory rate, percentage			2.00%
Nondeductible items, percentage			0.90%
Change in valuation allowance, percentage			(191.30%)
Income tax benefit from continuing operations, percentage			(153.40%)

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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