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Long-term debt - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Debt Instrument [Line Items]          
Unrealized losses on interest rate cap and swap agreements $ (478) $ (153) $ (5,479) $ (8,238)  
Weighted average effective interest rate on senior secured credit facilities 4.78%   4.78%    
Weighted average effective interest rate during quarter 4.77%        
Fixed interest rate 53.67%   53.67%    
DMG          
Debt Instrument [Line Items]          
Letters of credit outstanding $ 211   $ 211    
Revolving Credit Facility          
Debt Instrument [Line Items]          
Undrawn revolving credit facilities 1,000,000   1,000,000    
Letter of Credit          
Debt Instrument [Line Items]          
Letters of credit outstanding 94,568   94,568    
Interest Rate Cap Agreements Effective September 30, 2016          
Debt Instrument [Line Items]          
Notional amounts of interest rate agreements 3,500,000   $ 3,500,000    
Derivative, effective date     Sep. 30, 2016    
Derivative, expiration date     Jun. 30, 2018    
Debt expense recognized     $ 6,208    
Unrealized losses on interest rate cap and swap agreements     115    
Interest Rate Cap Agreements Effective June 29, 2018          
Debt Instrument [Line Items]          
Notional amounts of interest rate agreements 3,500,000   $ 3,500,000    
Derivative, effective date     Jun. 29, 2018    
Derivative, expiration date     Jun. 30, 2020    
Unrealized losses on interest rate cap and swap agreements     $ 8,852    
Fair value of assets $ 962   $ 962    
London Interbank Offered Rate (LIBOR) | Interest Rate Cap Agreements Effective September 30, 2016          
Debt Instrument [Line Items]          
LIBOR variable rate 3.50%   3.50%    
London Interbank Offered Rate (LIBOR) | Interest Rate Cap Agreements Effective June 29, 2018          
Debt Instrument [Line Items]          
LIBOR variable rate 3.50%   3.50%    
Term Loan A          
Debt Instrument [Line Items]          
Mandatory principal payments $ 62,500   $ 62,500    
Capped portion of interest payments 800,000   $ 800,000   $ 862,500
Term Loan A | London Interbank Offered Rate (LIBOR)          
Debt Instrument [Line Items]          
LIBOR plus interest rate margin     2.00%    
Term Loan B          
Debt Instrument [Line Items]          
Mandatory principal payments 26,250   $ 26,250    
Capped portion of interest payments 3,386,250   $ 3,386,250   $ 3,412,500
Term Loan B | London Interbank Offered Rate (LIBOR)          
Debt Instrument [Line Items]          
LIBOR plus interest rate margin     2.75%    
Term Loan B | London Interbank Offered Rate (LIBOR) | Maximum          
Debt Instrument [Line Items]          
LIBOR plus interest rate margin     3.50%    
Term Loan A subject to interest rate caps          
Debt Instrument [Line Items]          
Capped portion of interest payments 113,750   $ 113,750    
Term Loan A subject to uncapped portion of variability of LIBOR          
Debt Instrument [Line Items]          
Capped portion of interest payments $ 686,250   $ 686,250    
Senior Secured Credit Facilities          
Debt Instrument [Line Items]          
Weighted average effective interest rate on senior secured credit facilities 4.22%   4.22%