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Fair Value Measurements - Additional Information (Detail) (Maximum [Member])	3 Months Ended
	Mar. 31, 2013
Maximum [Member]
Financial Instruments And Fair Value Measurements [Line Items]
Cash Equivalents Original Maturity Period	90 days

X

- Details

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X

- Definition

Short Term Investment Maturity Period

+ References

No definition available.

+ Details

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Period Type:	duration