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Stock-Based Compensation - Narrative (Detail) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stocks granted 1,208,954 1,375,500  
Board of Director Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stocks granted 954 0  
Restricted Stock, Performance Based Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stocks granted 783,750 824,250  
Performance-based awards granted, percent 100.00%    
Restricted stock units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stocks granted 1,208,954    
Awards canceled (shares) 540,153    
Awards granted (USD per share) $ 11.36 $ 11.94  
Fair value of restricted stock awards vested $ 13.4 $ 6.9  
Payments Related to Tax Withholding for Share-based Compensation 4.2 $ 2.1  
Unrecognized compensation cost $ 21.4    
Unrecognized compensation cost, estimated weighted average amortization period 2 years    
Maximum | Restricted Stock, Performance Based Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance-based awards granted, percent 200.00%    
Minimum | Restricted Stock, Performance Based Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance-based awards granted, percent   0.00%  
Share-based Compensation Award, Tranche One | Restricted Stock, Performance Based Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Potentially vested shares     60.00%
Awards canceled (shares)     495,684
Share-based Compensation Award, Tranche Two | Restricted Stock, Performance Based Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Measurement period     3 years
Potentially vested shares     40.00%
Shares, potentially vested     351,066