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Earnings Per Share - Narrative (Detail)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Earnings Per Share [Abstract]      
Weighted-average options RSUs, and ESPP shares outstanding (shares) 8,130,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 4,424,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 5,793,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount