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Reconciliation of Earnings Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Earnings Per Share [Abstract]        
Net income for basic and diluted earnings per share $ 19,832 $ 4,491 $ 48,575 $ 35,202
Weighted average shares outstanding - basic 35,769 36,676 35,970 36,670
Dilutive effect of stock options and restricted stock 134 182 79 129
Weighted average shares outstanding - diluted 35,903 36,858 36,049 36,799
Earnings per share - basic $ 0.55 $ 0.12 $ 1.35 $ 0.96
Earnings per share - diluted $ 0.55 $ 0.12 $ 1.35 $ 0.96