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Intangible Assets, Net - Summary (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Intangible assets
Gross Value	$ 2,205,106		$ 2,183,399
Accumulated Amortization	(207,892)		(162,535)
Net Carrying Value	1,997,214		$ 2,020,864
Amortization expense for intangible assets	$ 46,600	$ 8,900
Weighted Average
Intangible assets
Weighted Average Remaining Useful Life	12 years 9 months 18 days		13 years 1 month 6 days
Client relationships
Intangible assets
Gross Value	$ 1,466,769		$ 1,460,648
Accumulated Amortization	(123,700)		(100,844)
Net Carrying Value	$ 1,343,069		$ 1,359,804
Client relationships \| Minimum
Intangible assets
Useful life	2 years		2 years
Client relationships \| Maximum
Intangible assets
Useful life	20 years		20 years
Client relationships \| Weighted Average
Intangible assets
Weighted Average Remaining Useful Life	15 years 2 months 12 days		15 years 4 months 24 days
Non-compete agreements
Intangible assets
Gross Value	$ 5,026		$ 5,097
Accumulated Amortization	(4,940)		(4,872)
Net Carrying Value	$ 86		$ 225
Non-compete agreements \| Minimum
Intangible assets
Useful life	1 year 6 months		1 year 6 months
Non-compete agreements \| Maximum
Intangible assets
Useful life	5 years		5 years
Non-compete agreements \| Weighted Average
Intangible assets
Weighted Average Remaining Useful Life	2 months 12 days		4 months 24 days
Trademarks
Intangible assets
Gross Value	$ 326,759		$ 326,786
Accumulated Amortization	(23,018)		(15,576)
Net Carrying Value	$ 303,741		$ 311,210
Trademarks \| Minimum
Intangible assets
Useful life	3 years		3 years
Trademarks \| Maximum
Intangible assets
Useful life	15 years		15 years
Trademarks \| Weighted Average
Intangible assets
Weighted Average Remaining Useful Life	10 years 2 months 12 days		10 years 6 months
Patents
Intangible assets
Gross Value	$ 200		$ 200
Accumulated Amortization	$ (200)		(200)
Net Carrying Value			$ 0
Useful life	3 years		3 years
Patents \| Weighted Average
Intangible assets
Weighted Average Remaining Useful Life	0 years		0 years
Capitalized software development costs
Intangible assets
Gross Value	$ 67,202		$ 52,518
Accumulated Amortization	(27,400)		(24,771)
Net Carrying Value	$ 39,802		$ 27,747
Capitalized software development costs \| Minimum
Intangible assets
Useful life	3 years		3 years
Capitalized software development costs \| Maximum
Intangible assets
Useful life	5 years		5 years
Capitalized software development costs \| Weighted Average
Intangible assets
Weighted Average Remaining Useful Life	2 years 9 months 18 days		2 years 9 months 18 days
Technology
Intangible assets
Gross Value	$ 339,150		$ 338,150
Accumulated Amortization	(28,634)		(16,272)
Net Carrying Value	$ 310,516		$ 321,878
Technology \| Minimum
Intangible assets
Useful life	5 years
Technology \| Maximum
Intangible assets
Useful life	7 years
Technology \| Weighted Average
Intangible assets
Weighted Average Remaining Useful Life	6 years 4 months 24 days		6 years 7 months 6 days