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Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Deferred Tax Liability Not Recognized [Line Items]
Operating loss carry forwards, federal	$ 89.5	$ 83.5
Operating loss carry forwards, state	602.9	596.8
Operating loss carry forwards, expiration year	2031
Deferred tax asset, valuation allowance	93.4	92.6
Deferred tax assets, valuation allowance adjustment	0.8
Deferred tax asset, provision for valuation allowance	$ 3.3	$ 3.3

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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- Definition

The amount of the valuation allowance recorded as of the balance sheet date pertaining to the specified deferred tax asset for which an assessment was made that it is more likely than not that all or a portion of such deferred tax asset will not be realized through related deductions on future tax returns.

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- Definition

The amount of the change in the period in the valuation allowance for a specified deferred tax asset.

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