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Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2010	Dec. 31, 2008
Income Taxes [Line Items]
Valuation allowance against deferred tax asset				$ 3.0
Increase in valuation allowance against net deferred tax asset			10.7
Amount of deferred tax assets that would be used to offset taxes in future years	13.8	7.0
Non-cash income tax benefit from reduction in valuation allowance of deferred tax assets	$ 5.0	$ 6.4
Carry forward period for net operating losses on U.S. federal and California state income tax returns for tax year 2010	20 years
Net operating losses, carry back period	2 years

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 portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to changes in the valuation allowance for deferred tax assets in the period.

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