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Earnings Per Share - Additional Information (Detail)
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Earnings Per Share [Abstract]          
Options to purchase shares, contingently issuable shares, and common stock warrants excluded from diluted net income per share computation 3,100,000 4,900,000 3,200,000 4,900,000  
Common stock outstanding 114,938,316   114,938,316   116,564,967