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Fair Value Measurements Reconciliation of Beginning and Ending Balances for Fair Value Measurements using Significant Unobservable Inputs (Detail) (Available For Sale Securities, USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Nov. 30, 2014
Nov. 30, 2013
Available For Sale Securities
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance $ 6,750us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AvailableforsaleSecuritiesMember		 $ 6,500us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AvailableforsaleSecuritiesMember
Purchases 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AvailableforsaleSecuritiesMember		 250us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AvailableforsaleSecuritiesMember
Ending Balance $ 6,750us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AvailableforsaleSecuritiesMember		 $ 6,750us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AvailableforsaleSecuritiesMember