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Stock-Based Compensation - Pre-Tax Compensation Expense and Related Income Tax Benefit for Stock-Based Incentives (Parenthetical) (Detail)	3 Months Ended
	Mar. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Tax rate - before valuation allowance	37.00%

X

- Definition

Effective Income Tax Benefit Rate

+ References

No definition available.

+ Details

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Period Type:	duration

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- Details

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Namespace Prefix:	us-gaap_
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