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Potentially Dilutive Securities Not Included in Computation of Diluted Net Loss Per Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Stock Options
     
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Anti dilutive Securities Excluded from Computation of Earnings Per Share, Shares   2 111
Anti Dilutive Securities Excluded from Computation of Earnings Per Share, Weighted Average Price   $ 15.80 $ 41.65
SARs
     
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Anti dilutive Securities Excluded from Computation of Earnings Per Share, Shares 655 2,201 1,601
Anti Dilutive Securities Excluded from Computation of Earnings Per Share, Weighted Average Price $ 10.98 $ 8.03 $ 7.19
Restricted Stock
     
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Anti dilutive Securities Excluded from Computation of Earnings Per Share, Shares 762 [1] 1,195 [1]  
Anti Dilutive Securities Excluded from Computation of Earnings Per Share, Weighted Average Price $ 8.08 [1] $ 9.18 [1]  
[1] Anti-dilutive securities include contingently issuable shares unvested as of December 31, 2012, the vesting of which is based on performance conditions and market conditions that have not yet been achieved. See Note 11, "Equity-Based Compensation."