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Income Taxes - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Income Taxes [Line Items]
Provision (Benefit) for income taxes	$ 74	$ 1,847	$ (5,118)	$ (4,294)
Effective income tax rate	25.70%	30.30%	24.50%	40.40%
Other adjustments
Income Taxes [Line Items]
Provision (Benefit) for income taxes			$ 400	$ 1,500

- 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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