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 Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Earnings Per Share [Abstract]    
Net Income $ 10,110 $ 7,341
Weighted-Average Shares, Basic EPS 31,538,980 31,470,520
Weighted-Average Shares, Effect of Dilutive Securities - Options, Warrants and Unvested Restricted Stock 87,687 19,049
Weighted-Average Shares, Diluted EPS 31,626,667 31,489,569
Per Share Amount, Basic EPS $ 0.32 $ 0.23
Per Share Amount, Effect of Dilutive Securities - Options, Warrants and Unvested Restricted Stock      
Per Share Amount, Diluted EPS $ 0.32 $ 0.23