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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 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Numerator - basic and diluted        
Net income $ 22,713 $ 29,439 $ 48,891 $ 64,022
Denominator        
Weighted average number of common shares outstanding - basic 40,387 40,182 40,446 41,535
Effect of dilutive stock options 160 884 590 895
Effect of dilutive convertible notes   647 224 722
Effect of dilutive restricted shares 555 554 622 519
Weighted average number of common shares outstanding - diluted 41,102 42,267 41,882 43,671
Earnings per common share - basic $ 0.56 $ 0.73 $ 1.21 $ 1.54
Earnings per common share - diluted $ 0.55 $ 0.70 $ 1.17 $ 1.47
Antidilutive stock options and restricted shares 5,421 2,612 3,678 2,330