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Income Taxes (Detail) (USD $)	3 Months Ended		6 Months Ended
Income Taxes (Detail) (USD $)	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
IncomeTaxDisclosureTextBlockAbstract
Income Tax Expense (Benefit)	$ 380,000	$ 14,412,000	$ 2,013,000	$ 14,273,000
Valuation Allowance, Deferred Tax Asset, Change in Amount			$ 2,100,000	$ 15,100,000

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

The amount of the change in the period in the valuation allowance for a specified deferred tax asset.