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Reconciliation of Earnings Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Earnings Per Share [Abstract]    
Net income for basic and diluted earnings per share $ 17,965 $ 10,276
Weighted average shares outstanding - basic 35,137 36,156
Dilutive effect of stock options and restricted stock (15) 13
Weighted average shares outstanding - diluted 35,122 36,169
Earnings per share - basic $ 0.51 $ 0.28
Earnings per share - diluted $ 0.51 $ 0.28