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Long-Term Debt - Interest Rate Cap and Swap Agreement (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Derivative [Line Items]      
Debt expense recognized $ 406,341,000 $ 394,013,000 $ 389,755,000
Unrealized losses on interest rate cap and swap agreements $ (5,437,000) $ (3,670,000) $ (12,241,000)
Weighted average effective interest rate 4.88%    
Weighted average effective interest rate 4.70%    
Interest Rate Cap Agreements Effective September 30, 2016      
Derivative [Line Items]      
Derivative, effective date Sep. 30, 2016    
Derivative, expiration date Jun. 30, 2018    
Debt expense recognized $ 8,278,000    
Unrealized losses on interest rate cap and swap agreements $ (115,000)    
Interest Rate Cap Agreements Effective June 29, 2018      
Derivative [Line Items]      
Derivative, effective date Jun. 29, 2018    
Derivative, expiration date Jun. 30, 2020    
Unrealized losses on interest rate cap and swap agreements $ (8,782,000)    
Fair value of assets 1,032,000    
Term Loan B | Maximum | Interest rate cap agreements 1      
Derivative [Line Items]      
Interest rate agreements, notional amount $ 3,500,000,000    
Debt instrument Interest rate 3.50%    
Remaining outstanding debt $ 652,500,000    
Senior Secured Credit Facilities      
Derivative [Line Items]      
Weighted average effective interest rate 4.45%    
London Interbank Offered Rate (LIBOR) | Term Loan B      
Derivative [Line Items]      
Debt instrument, variable interest rate margin 2.75%    
London Interbank Offered Rate (LIBOR) | Term Loan B | Maximum      
Derivative [Line Items]      
Debt instrument, variable interest rate margin 3.50%    
London Interbank Offered Rate (LIBOR) | Term Loan A      
Derivative [Line Items]      
Debt instrument, variable interest rate margin 2.00%    
Term Loan A Subject To Interest Rate Caps      
Derivative [Line Items]      
Senior secured credit facilities $ 122,500,000