Goodwill and Intangible Assets - Schedule of Amounts Related to Finite-Lived Intangible Assets (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Finite Lived Intangible Assets [Line Items]
Gross Balance	$ 249,949	$ 168,716
Accumulated Amortization	87,748	66,167
Total Intangible Assets—Net	162,201	102,549
Customer Relationships
Finite Lived Intangible Assets [Line Items]
Gross Balance	164,782	108,782
Accumulated Amortization	49,068	36,700
Total Intangible Assets—Net	$ 115,714	$ 72,082
Customer Relationships | Minimum
Finite Lived Intangible Assets [Line Items]
Estimated Useful Life	7 years	7 years
Customer Relationships | Maximum [Member]
Finite Lived Intangible Assets [Line Items]
Estimated Useful Life	15 years	10 years
Covenants Not to Compete
Finite Lived Intangible Assets [Line Items]
Gross Balance	$ 29,942	$ 25,832
Accumulated Amortization	20,444	17,572
Total Intangible Assets—Net	$ 9,498	$ 8,260
Covenants Not to Compete | Minimum
Finite Lived Intangible Assets [Line Items]
Estimated Useful Life	4 years	4 years
Covenants Not to Compete | Maximum [Member]
Finite Lived Intangible Assets [Line Items]
Estimated Useful Life	5 years	5 years
Trade Names
Finite Lived Intangible Assets [Line Items]
Gross Balance	$ 16,938	$ 12,738
Accumulated Amortization	12,196	10,230
Total Intangible Assets—Net	$ 4,742	$ 2,508
Trade Names | Minimum
Finite Lived Intangible Assets [Line Items]
Estimated Useful Life	1 year	1 year
Trade Names | Maximum [Member]
Finite Lived Intangible Assets [Line Items]
Estimated Useful Life	5 years	5 years
Proprietary Software
Finite Lived Intangible Assets [Line Items]
Estimated Useful Life		3 years
Gross Balance	$ 20,808	$ 3,885
Accumulated Amortization	4,915	1,359
Total Intangible Assets—Net	$ 15,893	$ 2,526
Proprietary Software | Minimum
Finite Lived Intangible Assets [Line Items]
Estimated Useful Life	3 years
Proprietary Software | Maximum [Member]
Finite Lived Intangible Assets [Line Items]
Estimated Useful Life	5 years
Patent
Finite Lived Intangible Assets [Line Items]
Estimated Useful Life	16 years	16 years
Gross Balance	$ 17,479	$ 17,479
Accumulated Amortization	1,125	306
Total Intangible Assets—Net	$ 16,354	$ 17,173