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Stock Option Activity and Related Information (Parenthetical) (Detail)
In Millions, unless otherwise specified
Dec. 31, 2014
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options outstanding and expected to vest 12.8us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber