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Basic and Diluted Earnings Per Share - Shares Excluded From Computation of Diluted earnings Per Share (Detail)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Shares 17,017,272us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 15,220,785us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 15,044,514us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount