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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, 2013
Dec. 31, 2012
Dec. 31, 2011
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]      
Beginning balance of Outstanding, Options 2,591,887 3,353,462 3,574,614
Granted, Options 1,934,005 534,895 565,720
Exercised, Options (1,275)   (141,625)
Forfeited, Options (261,366) (196,400) (456,459)
Cancelled, Options (362,816) (1,100,070) (188,788)
Ending balance of Outstanding, Options 3,900,435 2,591,887 3,353,462
Outstanding, Beginning, Weighted Average Exercise Price $ 25.96 $ 27.79 $ 28.29
Exercisable, Options 2,203,417    
Granted, Weighted Average Exercise Price $ 2.58 $ 7.91 $ 21.87
Exercised, Weighted Average Exercise Price $ 3.08   $ 14.60
Forfeited, Weighted Average Exercise Price $ 5.19 $ 18.52 $ 24.69
Cancelled, Weighted Average Exercise Price $ 31.60 $ 24.09 $ 36.94
Outstanding, Weighted Average Exercise Price $ 15.15 $ 25.96 $ 27.79
Exercisable, Weighted Average Exercise Price $ 23.42    
Outstanding, Weighted Average Remaining Contractual Term 6 years 9 months 18 days    
Exercisable, Weighted Average Remaining Contractual Term 5 years    
Exercised, Aggregate Intrinsic Value $ 3   $ 1,112
Outstanding, Aggregate Intrinsic Value 5,513    
Exercisable, Aggregate Intrinsic Value $ 1,116