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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 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Numerator - basic and diluted                      
Net income (loss) $ (7,139) $ (50,621) $ 23,486 $ 23,680 $ (85,877) $ 22,713 $ 7,747 $ 18,431 $ (10,594) $ (36,986) $ 103,903
Denominator                      
Weighted average number of common shares outstanding - basic 39,115 39,094 39,143 39,403 39,913 40,387 40,592 40,358 39,188 40,316 41,131
Effect of dilutive stock options                     915
Effect of dilutive convertible notes                     836
Effect of dilutive restricted shares                     591
Weighted average number of common shares outstanding - diluted 39,115 39,094 40,293 40,620 39,913 41,102 42,074 43,185 39,188 40,316 43,473
Earnings (loss) per common share - basic $ (0.18) $ (1.29) $ 0.60 $ 0.60 $ (2.15) $ 0.56 $ 0.19 $ 0.46 $ (0.27) $ (0.92) $ 2.53
Earnings (loss) per common share - diluted $ (0.18) $ (1.29) $ 0.58 $ 0.58 $ (2.15) $ 0.55 $ 0.18 $ 0.43 $ (0.27) $ (0.92) $ 2.39
Antidilutive stock options and restricted shares                 4,363 4,943 2,119