2.2.0.7 true Assumptions Utilized in the Binomial Lattice-Based Valuation Model in Calculating the Compensation Expense for Stock Options Granted (Detail) 150 - Disclosure - Assumptions Utilized in the Binomial Lattice-Based Valuation Model in Calculating the Compensation Expense for Stock Options Granted (Detail) true false false false 1 USD false false iso4217_USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 pure Standard http://www.xbrl.org/2003/instance pure 0 shares Standard http://www.xbrl.org/2003/instance shares 0 iso4217_USD_per_shares Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares 0 $ false 2 USD false false iso4217_USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 pure Standard http://www.xbrl.org/2003/instance pure 0 shares Standard http://www.xbrl.org/2003/instance shares 0 iso4217_USD_per_shares Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares 0 $ false 3 USD false false iso4217_USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 shares Standard http://www.xbrl.org/2003/instance shares 0 iso4217_USD_per_shares Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares 0 pure Standard http://www.xbrl.org/2003/instance pure 0 $ 2 2 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate us-gaap true na duration No definition available. false false false false false false false false false false false false 1 false true false false 0.037 0.037 false false false 2 false true false false 0.036 0.036 false false false 3 false true false false 0.034 0.034 false false false us-types:percentItemType pure The risk-free interest rate assumption that is used in valuing an option on its own shares. 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No authoritative reference available. false 8 2 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate us-gaap true na duration No definition available. false false false false false false false false false false false false 1 false true false false 0.040 0.040 false false false 2 false true false false 0.038 0.038 false false false 3 false true false false 0.038 0.038 false false false us-types:percentItemType pure The risk-free interest rate assumption that is used in valuing an option on its own shares. 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