Fair Value Measurements Fair Value Measurements Narrative (Detail) (Details)
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6 Months Ended |
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Jun. 30, 2012
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Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] | |
Valuation model discount rate | 20.00% |
Valulation Model Probability Low Range | 86.00% |
Valuation Model Probability High Range | 100.00% |