INTANGIBLE ASSETS (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets, net	$ 447,900,000		$ 447,900,000		$ 426,745,000
Impairment of intangible assets, finite-lived	0	$ 0	0	$ 0
Acquired technology and data
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	131,729,000		131,729,000		131,551,000
Accumulated amortization	(103,581,000)		(103,581,000)		(97,791,000)
Intangible assets, net	28,148,000		$ 28,148,000		33,760,000
Weighted-average amortization period			5 years
Acquired customer base
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	612,092,000		$ 612,092,000		545,643,000
Accumulated amortization	(351,478,000)		(351,478,000)		(296,758,000)
Intangible assets, net	260,614,000		$ 260,614,000		248,885,000
Weighted-average amortization period			10 years
Acquired trade names and other intangible assets
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	283,294,000		$ 283,294,000		249,465,000
Accumulated amortization	(124,156,000)		(124,156,000)		(105,365,000)
Intangible assets, net	$ 159,138,000		$ 159,138,000		$ 144,100,000
Weighted-average amortization period			12 years