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Long-Term Debt - Schedule of Long-Term Debt (Parenthetical) (Detail) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Jul. 31, 2015
Apr. 14, 2014
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Senior Secured Term Loan Facility [Member]          
Debt Instrument [Line Items]          
Debt instrument, floor interest rate   1.00%      
First lien net leverage ratio, description     First lien net leverage ratio of less than or equal to 4.50 to 1.00    
First lien net leverage ratio 4.50 4.50      
Term Facility [Member]          
Debt Instrument [Line Items]          
Quarterly principal payments     $ 13.1 $ 13.3  
Principal pre-payment on term facility       $ 135.0  
Debt instrument, basis spread on variable rate 3.00%        
Unamortized long-term debt reduction     7.1   $ 8.2
Debt issuance costs net     19.4   22.4
Accrued interest     $ 16.2   $ 16.5
Term Facility [Member] | Senior Secured Term Loan Facility [Member]          
Debt Instrument [Line Items]          
Debt instrument, basis spread on variable rate 2.75%        
First lien net leverage ratio, description     first lien net leverage ratio of less than 4.50 to 1.00    
First lien net leverage ratio 0.0450        
LIBOR [Member]          
Debt Instrument [Line Items]          
Debt instrument, interest rate     0.53%   0.36%
LIBOR [Member] | Senior Secured Term Loan Facility [Member]          
Debt Instrument [Line Items]          
Debt instrument, basis spread on variable rate   3.00%      
LIBOR [Member] | Term Facility [Member]          
Debt Instrument [Line Items]          
Debt instrument, floor interest rate 1.00%        
LIBOR [Member] | Term Facility [Member] | Senior Secured Term Loan Facility [Member]          
Debt Instrument [Line Items]          
Debt instrument, floor interest rate 1.00%