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Stock-Based Compensation - Stock Option Activity (Detail) (USD $)
 1 Months Ended 12 Months Ended
Jan. 31, 2011
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]          
Number of Shares, Beginning balance 1,098,241 447,359 875,498 1,098,241  
Number of Shares, Granted 6,000,000     3,750  
Number of Shares, Exercised   (3,452) (3,629) (1,692)  
Number of Shares, Cancelled (forfeited and expired)   (15,649) (424,510) (224,801)  
Number of Shares, Ending balance   428,258 447,359 875,498 1,098,241
Weighted-Average Exercise Price, Beginning balance $ 20.20 $ 19.59 $ 20.13 $ 20.20  
Number of Shares, Exercisable   409,792      
Weighted-Average Exercise Price, Granted       $ 7.30  
Number of Shares, Vested and expected to vest   426,027      
Weighted-Average Exercise Price, Exercised   $ 1.00 $ 1.00 $ 1.41  
Weighted-Average Exercise Price, Cancelled (forfeited and expired)   $ 13.06 $ 20.86 $ 20.22  
Weighted-Average Exercise Price, Ending balance   $ 19.97 $ 19.59 $ 20.13 $ 20.20
Aggregate Intrinsic Value, Beginning balance $ 398,219 $ 2,175   $ 398,219  
Weighted-Average Exercise Price, Exercisable   $ 20.42      
Aggregate Intrinsic Value, Exercised   2,214 4,319 11,293  
Weighted-Average Exercise Price, Vested and expected to vest   $ 20.02      
Aggregate Intrinsic Value, Ending balance     2,175   398,219
Weighted-Average Remaining Contractual Term, Outstanding   4 years 3 months 18 days 5 years 1 month 6 days 5 years 6 months 6 years 1 month 6 days
Aggregate Intrinsic Value, Exercisable           
Weighted-Average Remaining Contractual Term, Exercisable   4 years 2 months 12 days      
Aggregate Intrinsic Value, Vested and expected to vest           
Weighted-Average Remaining Contractual Term, Vested and expected to vest   4 years 3 months 18 days