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Long-Term Debt - Schedule of Long-Term Debt (Parenthetical) (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jul. 31, 2015
Apr. 14, 2014
Mar. 31, 2017
Dec. 31, 2016
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     $ 4.4  
Debt instrument, basis spread on variable rate 3.00%      
Unamortized long-term debt reduction     6.4 $ 6.7
Debt issuance costs net     17.5 18.5
Accrued interest     $ 15.2 $ 16.2
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 4.50      
LIBOR [Member]        
Debt Instrument [Line Items]        
Debt instrument, interest rate     0.93% 0.72%
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%