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Share-Based Compensation - Summary of Stock Option Activity (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Schedule Of Stock Options [Line Items]      
Beginning balance of Outstanding Options 3,353,462 3,574,614 3,213,102
Granted, Options 534,895 565,720 626,664
Exercised, Options   (141,625) (51,528)
Forfeited, Options (196,400) (456,459) (84,779)
Cancelled, Options (1,100,070) (188,788) (128,845)
Ending balance of Outstanding Options 2,591,887 3,353,462 3,574,614
Outstanding, Beginning Weighted Average Exercise Price $ 27.79 $ 28.29 $ 28.30
Exercisable Options 1,936,936    
Granted, Weighted Average Exercise Price $ 7.91 $ 21.87 $ 29.53
Exercised, Weighted Average Exercise Price   $ 14.60 $ 14.87
Forfeited, Weighted Average Exercise Price $ 18.52 $ 24.69 $ 27.07
Cancelled, Weighted Average Exercise Price $ 24.09 $ 36.94 $ 40.70
Outstanding, Weighted Average Exercise Price $ 25.96 $ 27.79 $ 28.29
Exercisable, Weighted Average Exercise Price $ 30.24    
Outstanding, Weighted Average Remaining Contractual Term 5 years 3 months 11 days    
Exercisable, Weighted Average Remaining Contractual Term 4 years 1 month 6 days    
Exercised, Aggregate Intrinsic Value   $ 1,112 $ 651
Outstanding as of December 31, 2012 $ 10