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Earnings Per Share - Additional Information (Detail)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Earnings Per Share [Abstract]      
Options to purchase shares, contingently issuable shares, and common stock warrants excluded from diluted net income per share computation 2,900,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 4,500,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 5,100,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Common stock outstanding 115,637,804us-gaap_CommonStockSharesOutstanding 116,564,967us-gaap_CommonStockSharesOutstanding