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Income Tax Benefit and Effective Tax Rate (Detail) (USD $)
In Thousands, unless otherwise specified

3 Months Ended

Mar. 31, 2013

Mar. 31, 2012

Income Taxes [Line Items]

Income tax (expense) benefit

$ (183)

^[1]

$ 60

Effective tax rate

2.00%

1.00%

[1]	Restated and Revised, see Note 2

- 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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