INTANGIBLE ASSETS - Summary of Acquired Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 7,209,812		$ 7,210,005
Accumulated Amortization	(5,655,369)		(5,549,674)
Net Carrying Amount	1,554,443		1,660,331
Amortization of intangible assets	105,695	$ 147,155
Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	6,123,586		6,123,586
Accumulated Amortization	(4,588,624)		(4,484,286)
Net Carrying Amount	1,534,962		1,639,300
Trade names
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,024,300		1,024,300
Accumulated Amortization	(1,018,658)		(1,018,212)
Net Carrying Amount	5,642		6,088
Other amortizable intangibles
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	61,926		62,119
Accumulated Amortization	(48,087)		(47,176)
Net Carrying Amount	$ 13,839		$ 14,943
Minimum | Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	3 years
Minimum | Trade names
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	4 years
Minimum | Other amortizable intangibles
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	1 year
Maximum | Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	18 years
Maximum | Trade names
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	10 years
Maximum | Other amortizable intangibles
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	15 years