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Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended
Income Taxes - Additional Information (Detail) (USD $)	Mar. 31, 2013	Mar. 31, 2012
Income Taxes [Line Items]
Provision (benefit) for income taxes	$ 300,000	$ 5,200,000
Effective income tax rate	1.10%	24.50%
Provision (benefit) for income taxes	300,000	(5,192,000)
Discrete tax benefits \| Reduction of Uncertain Tax Positions
Income Taxes [Line Items]
Provision (benefit) for income taxes	73,000
Discrete tax benefits \| State tax apportionment changes and an adjustment
Income Taxes [Line Items]
Provision (benefit) for income taxes		$ 400,000

- Definition

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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- Definition

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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