Quarterly report pursuant to Section 13 or 15(d)

Earnings Per Share - Reconciliation of Components Used to Derive Basic and Diluted EPS (Detail)

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Earnings Per Share - Reconciliation of Components Used to Derive Basic and Diluted EPS (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Earnings Per Share [Abstract]        
Net income $ 10,250 $ 13,279 $ 29,879 $ 76,395
Weighted-Average Shares, Basic EPS 31,621,049 31,475,976 31,583,897 31,474,042
Weighted-Average Shares, Effect of dilutive securities-options, warrants and unvested restricted stock 111,955 69,135 68,898 32,725
Weighted-Average Shares, Diluted EPS 31,733,004 31,545,111 31,652,795 31,506,767
Per Share Amount, Basic EPS $ 0.32 $ 0.42 $ 0.95 $ 2.43
Per Share Amount, Effect of dilutive securities-options, warrants and unvested restricted stock       $ (0.01) $ (0.01)
Per Share Amount, Diluted EPS $ 0.32 $ 0.42 $ 0.94 $ 2.42