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Earnings (Loss) Per Common Share Basic and Diluted (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Numerator - basic and diluted                      
Net income (loss) $ (85,877) $ 22,713 $ 7,747 $ 18,431 $ 39,881 $ 29,439 $ 15,325 $ 19,258 $ (36,986) $ 103,903 $ 65,984
Denominator                      
Weighted average number of common shares outstanding - basic 39,913 40,387 40,592 40,358 39,932 40,182 40,587 43,877 40,316 41,131 45,557
Effect of dilutive stock options                   915 915
Effect of dilutive convertible notes                   836 863
Effect of dilutive restricted shares                   591 329
Weighted average number of common shares outstanding - diluted 39,913 41,102 42,074 43,185 42,857 42,267 42,912 45,939 40,316 43,473 47,664
Earnings (loss) per common share - basic $ (2.15) $ 0.56 $ 0.19 $ 0.46 $ 1.00 $ 0.73 $ 0.38 $ 0.44 $ (0.92) $ 2.53 $ 1.45
Earnings (loss) per common share - diluted $ (2.15) $ 0.55 $ 0.18 $ 0.43 $ 0.93 $ 0.70 $ 0.36 $ 0.42 $ (0.92) $ 2.39 $ 1.38
Antidilutive stock options and restricted shares                 4,943 2,119 1,606