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Reconciliation of Earnings Per Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Earnings Per Share Disclosure [Line Items]        
Net income for basic and diluted earnings per share $ 18,495 $ 16,276 $ 49,109 $ 41,164
Weighted average shares outstanding - basic 37,079 36,923 37,064 36,903
Dilutive effect of stock options and restricted stock 127 142 116 146
Weighted average shares outstanding - diluted 37,206 37,065 37,180 37,049
Earnings per share - basic $ 0.50 $ 0.44 $ 1.32 $ 1.12
Earnings per share - diluted $ 0.50 $ 0.44 $ 1.32 $ 1.11