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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
Mar. 31, 2014
Mar. 31, 2013
Numerator-basic and diluted    
Net income $ 18,117 $ 23,680
Denominator    
Weighted average number of common shares outstanding-basic 39,438 39,403
Effect of dilutive stock options 356 595
Effect of dilutive restricted shares 663 622
Weighted average number of common shares outstanding-diluted 40,457 40,620
Earnings per common share-basic $ 0.46 $ 0.60
Earnings per common share-diluted $ 0.45 $ 0.58
Antidilutive stock options and restricted shares 3,177 3,486