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Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Tax Disclosure [Abstract]
Retroactive tax relief			$ 500,000
Provisions for income taxes	$ 4,367,000	$ 15,451,000	$ 3,622,000	$ 23,253,000
Percentage of pre-tax income			37.00%	36.00%

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Retroactive Tax Relief For Tax Provisions Expired

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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