Business Acquisitions - Weighted Average Useful Lives for Acquired Identifiable Intangible Assets (Details)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Customer Relationships | Matrix
Business Acquisition [Line Items]
Weighted average useful lives for acquired intangible assets	12 years
Customer Relationships | GreenPath
Business Acquisition [Line Items]
Weighted average useful lives for acquired intangible assets	12 years
Customer Relationships | All Other 2023 Acquisitions
Business Acquisition [Line Items]
Weighted average useful lives for acquired intangible assets	7 years
Customer Relationships | Environmental Standards
Business Acquisition [Line Items]
Weighted average useful lives for acquired intangible assets		7 years
Customer Relationships | All Other 2022 Acquisitions
Business Acquisition [Line Items]
Weighted average useful lives for acquired intangible assets		7 years
Customer Relationships | MSE Group | Minimum
Business Acquisition [Line Items]
Weighted average useful lives for acquired intangible assets			2 years
Customer Relationships | MSE Group | Maximum
Business Acquisition [Line Items]
Weighted average useful lives for acquired intangible assets			7 years
Customer Relationships | EI
Business Acquisition [Line Items]
Weighted average useful lives for acquired intangible assets			10 years
Customer Relationships | All Other 2021 Acquisitions
Business Acquisition [Line Items]
Weighted average useful lives for acquired intangible assets			10 years
Trade Names | Matrix
Business Acquisition [Line Items]
Weighted average useful lives for acquired intangible assets	2 years 6 months
Trade Names | GreenPath
Business Acquisition [Line Items]
Weighted average useful lives for acquired intangible assets	1 year
Trade Names | All Other 2023 Acquisitions
Business Acquisition [Line Items]
Weighted average useful lives for acquired intangible assets	2 years
Trade Names | Environmental Standards
Business Acquisition [Line Items]
Weighted average useful lives for acquired intangible assets		2 years
Trade Names | All Other 2022 Acquisitions
Business Acquisition [Line Items]
Weighted average useful lives for acquired intangible assets		2 years
Trade Names | MSE Group
Business Acquisition [Line Items]
Weighted average useful lives for acquired intangible assets			2 years
Trade Names | EI
Business Acquisition [Line Items]
Weighted average useful lives for acquired intangible assets			5 years
Trade Names | All Other 2021 Acquisitions
Business Acquisition [Line Items]
Weighted average useful lives for acquired intangible assets			3 years
Covenants Not to Compete | Matrix
Business Acquisition [Line Items]
Weighted average useful lives for acquired intangible assets	5 years
Covenants Not to Compete | GreenPath
Business Acquisition [Line Items]
Weighted average useful lives for acquired intangible assets	5 years
Covenants Not to Compete | All Other 2023 Acquisitions
Business Acquisition [Line Items]
Weighted average useful lives for acquired intangible assets	5 years
Covenants Not to Compete | Environmental Standards
Business Acquisition [Line Items]
Weighted average useful lives for acquired intangible assets		5 years
Covenants Not to Compete | All Other 2022 Acquisitions
Business Acquisition [Line Items]
Weighted average useful lives for acquired intangible assets		5 years
Covenants Not to Compete | MSE Group
Business Acquisition [Line Items]
Weighted average useful lives for acquired intangible assets			5 years
Covenants Not to Compete | EI
Business Acquisition [Line Items]
Weighted average useful lives for acquired intangible assets			5 years
Covenants Not to Compete | All Other 2021 Acquisitions
Business Acquisition [Line Items]
Weighted average useful lives for acquired intangible assets			5 years
Proprietary Software | GreenPath
Business Acquisition [Line Items]
Weighted average useful lives for acquired intangible assets	5 years
Developed Technology | All Other 2021 Acquisitions
Business Acquisition [Line Items]
Weighted average useful lives for acquired intangible assets			5 years