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Earnings Per Common Share Basic and Diluted (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Numerator-basic and diluted        
Net income $ 17,247 $ 23,486 $ 35,364 $ 47,166
Denominator        
Weighted average number of common shares outstanding-basic 39,681 39,143 39,560 39,272
Effect of dilutive stock options 288 589 322 592
Effect of dilutive restricted shares 781 561 722 592
Weighted average number of common shares outstanding-diluted 40,750 40,293 40,604 40,456
Earnings per common share-basic $ 0.43 $ 0.60 $ 0.89 $ 1.20
Earnings per common share-diluted $ 0.42 $ 0.58 $ 0.87 $ 1.17
Antidilutive stock options and restricted shares 3,637 3,593 3,408 3,541