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Earnings Per Share - Reconciliation of Earnings Per Share (Detail) (USD $)
In Thousands, except Per 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 for basic and diluted earnings per share $ 18,600 $ 18,495 $ 52,574 $ 49,109
Weighted average shares outstanding - basic 36,873 37,079 36,866 37,064
Dilutive effect of stock options and restricted stock 177 127 130 116
Weighted average shares outstanding - diluted 37,050 37,206 36,996 37,180
Earnings per share - basic $ 0.50 $ 0.50 $ 1.43 $ 1.32
Earnings per share - diluted $ 0.50 $ 0.50 $ 1.42 $ 1.32