Long-Term Debt - Schedule of Long-Term Debt (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Senior Notes:
Total debt principal outstanding	$ 10,154,216	$ 9,400,182
Discount and deferred financing costs	(52,000)	(63,951)
Carrying amount of long-term debt, net of unamortized discounts	10,102,216	9,336,231
Less current portion	(1,929,369)	(178,213)
Total long-term debt	$ 8,172,847	9,158,018
Debt interest rate	4.96%
Senior Notes 5.75% due 2022
Senior Notes:
Senior Notes	$ 1,250,000	1,250,000
Debt interest rate	5.75%
Debt Instrument, Maturity Date	Aug. 15, 2022
Senior Notes 5.125 Percent Due 2024
Senior Notes:
Senior Notes	$ 1,750,000	1,750,000
Debt interest rate	5.125%
Debt Instrument, Maturity Date	Jul. 15, 2024
Senior Notes 5.0 Percent Due 2025
Senior Notes:
Senior Notes	$ 1,500,000	1,500,000
Debt interest rate	5.00%
Debt Instrument, Maturity Date	May 01, 2025
Acquisition Obligations and Other Notes Payable
Senior Notes:
Acquisition obligations and other notes payable	$ 183,979	150,512
Debt interest rate	6.24%
Debt Instrument, Maturity Date, Description	2019-2025
Capital Lease Obligations
Senior Notes:
Capital lease obligations	$ 282,737	297,170
Debt interest rate	5.49%
Debt Instrument, Maturity Date, Description	2019-2036
Term Loan A
Debt Instrument [Line Items]
Senior secured credit facilities	$ 675,000	775,000
Senior Notes:
Debt Instrument, Description of Variable Rate Basis	2.00% + LIBOR
Debt Instrument, Maturity Date	Jun. 24, 2019
Term Loan A-2
Debt Instrument [Line Items]
Senior secured credit facilities		0
Senior Notes:
Debt Instrument, Description of Variable Rate Basis	1.00% + LIBOR
Debt Instrument, Maturity Date	Jun. 24, 2019
Term Loan B
Debt Instrument [Line Items]
Senior secured credit facilities	$ 3,342,500	3,377,500
Senior Notes:
Debt Instrument, Description of Variable Rate Basis	2.75% + LIBOR
Debt Instrument, Maturity Date	Jun. 24, 2021
Revolver
Debt Instrument [Line Items]
Senior secured credit facilities	$ 175,000	$ 300,000
Senior Notes:
Debt Instrument, Description of Variable Rate Basis	2.00% + LIBOR
Debt Instrument, Maturity Date	Jun. 24, 2019

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