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Stock-Based Compensation - Summary of Stock Option Activity (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2013
Jun. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Number of Stock Options, Beginning Balance     0
Number of Stock Options, Converstion Outstanding to options 782    
Number of stock options, Granted at market value 4,324    
Number of Stock Options, Exercised 0    
Number of Stock Options, Forfeited or expired (79)    
Number of Stock Options, Ending Balance   5,027 0
Number of Stock Options, Exercisable   703  
Available for future grants   6,327 [1]  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]      
Weighted-Average Exercise Price, Beginning Balance   $ 0.00  
Weighted-Average Exercise Price, Granted at Market Value $ 41.25    
Weighted-Average Exercise Price, Granted at market value $ 15.19    
Weighted-Average Exercise Price, Exercised $ 0.00    
Weighted-Average Exercise Price, Forfeited or expired $ 45.81    
Weighted-Average Exercise Price, Ending Balance   $ 18.76  
Weighted-Average Exercise Price, Exercisable   $ 40.74  
Aggregate Intrinsic Value of Options, Outstanding   $ 387  
Aggregate Intrinsic Value of Options, Exercised   $ 381  
Weighted-Average Remaining Life, Outstanding   4 years 5 months 27 days  
Weighted-Average Remaining Life, Exercisable   2 years 7 months 10 days  
Stock Appreciation Rights (SARs) [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Number of stock options, Granted at market value 1,700    
[1] Represents both options and awards available for grant.