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
Mar. 31, 2014
Mar. 31, 2013
Earnings Per Share [Abstract]    
Net income $ 11,035 $ 10,110
Weighted-Average Shares, Basic EPS 31,659,705 31,538,980
Weighted-Average Shares, Effect of dilutive securities - options, warrants and unvested restricted stock 274,458 87,687
Weighted-Average Shares, Diluted EPS 31,934,163 31,626,667
Per Share Amount, Basic EPS $ 0.35 $ 0.32
Per Share Amount, Effect of dilutive securities - options, warrants and unvested restricted stock      
Per Share Amount, Diluted EPS $ 0.35 $ 0.32