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Reconciliation of Earnings Per Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Earnings Per Share [Abstract]                      
Net income for basic and diluted earnings per share $ 16,536 $ 18,600 $ 18,610 $ 15,364 $ 18,844 $ 18,495 $ 16,952 $ 13,662 $ 69,110 $ 67,953 $ 58,178
Weighted average shares outstanding - basic                 36,829 37,053 36,913
Dilutive effect of stock options and restricted stock                 153 132 150
Weighted average shares outstanding - diluted                 36,982 37,185 37,063
Earnings per share - basic $ 0.45 $ 0.50 $ 0.50 $ 0.42 $ 0.51 $ 0.50 $ 0.46 $ 0.37 $ 1.88 $ 1.83 $ 1.58
Earnings per share - diluted $ 0.45 $ 0.50 $ 0.50 $ 0.42 $ 0.51 $ 0.50 $ 0.46 $ 0.37 $ 1.87 $ 1.83 $ 1.57