Long-term Debt - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Debt Instrument [Line Items]
Unrealized losses on interest rate cap and swap agreements	$ (3,188)	$ (5,469)
Weighted average effective interest rate	4.64%
Weighted average effective interest rate	4.55%
Fixed interest rate	53.08%
DMG
Debt Instrument [Line Items]
Letters of credit outstanding	$ 1,286
Revolving Credit Facility
Debt Instrument [Line Items]
Undrawn revolving credit facilities	1,000,000
Letter of Credit
Debt Instrument [Line Items]
Letters of credit outstanding	94,623
Interest Rate Cap Agreements Effective September 30, 2016
Debt Instrument [Line Items]
Interest rate agreements, notional amount	$ 3,500,000
Derivative, effective date	Sep. 30, 2016
Derivative, expiration date	Jun. 30, 2018
Fair value of assets	$ 14
Debt expense recognized	2,070
Unrealized losses on interest rate cap and swap agreements	102
Interest Rate Cap Agreements Effective June 29, 2018
Debt Instrument [Line Items]
Interest rate agreements, notional amount	$ 3,500,000
Derivative, effective date	Jun. 29, 2018
Derivative, expiration date	Jun. 30, 2020
Fair value of assets	$ 4,698
Unrealized losses on interest rate cap and swap agreements	$ 5,115
London Interbank Offered Rate (LIBOR) | Interest Rate Cap Agreements Effective September 30, 2016
Debt Instrument [Line Items]
LIBOR cap rate	3.50%
London Interbank Offered Rate (LIBOR) | Interest Rate Cap Agreements Effective June 29, 2018
Debt Instrument [Line Items]
LIBOR cap rate	3.50%
Term Loan A
Debt Instrument [Line Items]
Debt instrument, annual principal payment	$ 18,750
Senior Secured Credit Facilities	$ 843,750		$ 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	$ 8,750
Senior Secured Credit Facilities	$ 3,403,750		$ 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	$ 96,250
Term Loan A subject to uncapped portion of variability of LIBOR
Debt Instrument [Line Items]
Senior Secured Credit Facilities	$ 747,500
Senior Secured Credit Facilities
Debt Instrument [Line Items]
Weighted average effective interest rate	3.95%