Business Acquisitions - Weighted Average Useful Lives for Acquired Identifiable Intangible Assets (Details)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2019
Customer Relationships
Business Acquisition [Line Items]
Weighted average useful lives for acquired intangible assets		9 years 6 months
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
Business Acquisition [Line Items]
Weighted average useful lives for acquired intangible assets		1 year 6 months
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
Business Acquisition [Line Items]
Weighted average useful lives for acquired intangible assets		4 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
Developed Technology | All Other 2021 Acquisitions
Business Acquisition [Line Items]
Weighted average useful lives for acquired intangible assets	5 years