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Calculations of Net Income (Loss) Per Share (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
Basic:                      
Net income (loss) $ (10,808) $ (8,757) $ (10,137) $ (9,660) $ (24,539) $ 22,331 $ 121,815 $ (9,010) $ (39,362) $ 110,597 $ 26,609
Average common shares outstanding                 20,974 20,764 20,535
Net income (loss) per share $ (0.51) [1] $ (0.42) [1] $ (0.48) [1] $ (0.46) [1] $ (1.18) [1] $ 1.07 [1] $ 5.87 [1] $ (0.44) [1] $ (1.88) $ 5.33 $ 1.30
Diluted:                      
Net income (loss) (10,808) (8,757) (10,137) (9,660) (24,539) 22,331 121,815 (9,010) (39,362) 110,597 26,609
Interest on convertible senior debentures                   5,750  
Net income (loss) for diluted per share calculation                 $ (39,362) $ 116,347 $ 26,609
Number of shares used in basic per share computation                 20,974 20,764 20,535
Number of shares used in diluted per share computation                 20,974 24,522 21,507
Net income (loss) per share $ (0.51) [1] $ (0.42) [1] $ (0.48) [1] $ (0.46) [1] $ (1.18) [1] $ 0.98 [1] $ 5.05 [1] $ (0.46) [1] $ (1.88) $ 4.74 $ 1.24
Convertible Senior Debentures
                     
Diluted:                      
Convertible senior debentures                   3,009  
Unvested restricted stock and DSUs
                     
Diluted:                      
Stock options                   60 115
Employee stock options
                     
Diluted:                      
Stock options                   689 857
[1] Per share amounts for the quarters have each been calculated separately. Accordingly, quarterly amounts may not add to the annual amounts because of differences in the average common shares outstanding during each period. Additionally, in regard to diluted per share amounts only, quarterly amounts may not add to the annual amounts because of the inclusion of the effect of potentially dilutive securities only in the periods in which such effect would have been dilutive, and because of the adjustments to net income (loss) for the dilutive effect of partner company common stock equivalents and convertible securities.