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Long-term Debt - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Debt Instrument [Line Items]          
Unrealized losses on interest rate cap and swap agreements $ (1,815) $ (2,616) $ (5,002) $ (8,085)  
Weighted average effective interest rate at quarter end 4.76%   4.76%    
Weighted average effective interest rate during quarter 4.69%        
Fixed interest rate 53.31%   53.31%    
DMG          
Debt Instrument [Line Items]          
Letters of credit outstanding $ 1,286   $ 1,286    
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 94,623   94,623    
Interest Rate Cap Agreements Effective September 30, 2016          
Debt Instrument [Line Items]          
Interest rate agreements, notional amount 3,500,000   $ 3,500,000    
Derivative, effective date     Sep. 30, 2016    
Derivative, expiration date     Jun. 30, 2018    
Fair value of assets 1   $ 1    
Debt expense recognized     4,139    
Unrealized losses on interest rate cap and swap agreements     115    
Interest Rate Cap Agreements Effective June 29, 2018          
Debt Instrument [Line Items]          
Interest rate agreements, notional amount 3,500,000   $ 3,500,000    
Derivative, effective date     Jun. 29, 2018    
Derivative, expiration date     Jun. 30, 2020    
Fair value of assets $ 1,742   $ 1,742    
Unrealized losses on interest rate cap and swap agreements     $ 8,071    
London Interbank Offered Rate (LIBOR) | Interest Rate Cap Agreements Effective September 30, 2016          
Debt Instrument [Line Items]          
LIBOR cap rate 3.50%   3.50%    
London Interbank Offered Rate (LIBOR) | Interest Rate Cap Agreements Effective June 29, 2018          
Debt Instrument [Line Items]          
LIBOR cap rate 3.50%   3.50%    
Term Loan A          
Debt Instrument [Line Items]          
Debt instrument, annual principal payment $ 37,500   $ 37,500    
Senior Secured Credit Facilities 825,000   $ 825,000   $ 862,500
Term Loan A | London Interbank Offered Rate (LIBOR)          
Debt Instrument [Line Items]          
Debt instrument, variable interest rate margin     2.00%    
Term Loan B          
Debt Instrument [Line Items]          
Debt instrument, annual principal payment 17,500   $ 17,500    
Senior Secured Credit Facilities 3,395,000   $ 3,395,000   $ 3,412,500
Term Loan B | London Interbank Offered Rate (LIBOR)          
Debt Instrument [Line Items]          
Debt instrument, variable interest rate margin     2.75%    
Term Loan B | London Interbank Offered Rate (LIBOR) | Maximum          
Debt Instrument [Line Items]          
Debt instrument, variable interest rate margin     3.50%    
Term Loan A subject to interest rate caps          
Debt Instrument [Line Items]          
Senior Secured Credit Facilities 105,000   $ 105,000    
Term Loan A subject to uncapped portion of variability of LIBOR          
Debt Instrument [Line Items]          
Senior Secured Credit Facilities $ 720,000   $ 720,000    
Senior Secured Credit Facilities          
Debt Instrument [Line Items]          
Weighted average effective interest rate at quarter end 4.20%   4.20%