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Earnings Per Share - Additional Information (Detail)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Earnings Per Share [Abstract]          
Options to purchase shares, restricted share awards, common stock warrants and contingently issuable shares excluded from diluted earnings (loss) per share computation 1,600,000 1,400,000 1,600,000 5,900,000  
Common stock outstanding 38,441,873   38,441,873   39,447,773