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Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Operating Loss Carryforwards [Line Items]
Retroactive tax relief	$ 500,000
Provision(benefit) for income taxes	$ (745,000)	$ 7,802,000
Percentage of pre-tax income	38.00%	35.00%

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- Definition

Retroactive Tax Relief For Tax Provisions Expired

+ References

No definition available.

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- 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.

+ References

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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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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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