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Stockholders' Equity - Computation of Basic and Diluted Earnings Per Share (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Numerator:        
Net income (loss) available to common shareholders $ (15,298) $ (14,312) $ 19,495 $ 6,339
Denominator:        
Basic weighted average shares outstanding 16,830,106 16,677,159 16,886,355 15,910,300
Effect of dilutive securities:        
SARs and options     283,095 421,539
Convertible notes        643,978
Restricted stock     84,005 35,889
Diluted weighted average shares outstanding 16,830,106 16,677,159 17,253,455 17,011,706
Basic earnings (loss) per share $ (0.91) $ (0.86) $ 1.15 $ 0.40
Diluted earnings (loss) per share $ (0.91) $ (0.86) $ 1.13 $ 0.37