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Fair Value Measurements Fair Value Measurements Narrative (Detail) (Details)
6 Months Ended
Jun. 30, 2012
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%