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Change In Acquisition-Related Contingent Consideration Liability (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Business Acquisition, Contingent Consideration [Line Items]
Acquisition-related contingent consideration liability	$ 2.5

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- Definition

Business Acquisition Contingent Consideration Reduction Of Liability Due To Elimination of Contingency

+ References

No definition available.

+ Details

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Period Type:	duration

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- Details

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