Business Acquisitions - Summary of Purchase Price Attributable to Acquisitions (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Business Acquisition [Line Items]
Cash	$ 295	$ 3,754
Accounts receivable and contract assets	4,876
Accounts receivable		11,369
Other current assets	456	404
Current assets	5,627	15,527
Property and equipment	168	1,713
Operating lease right-of-use asset-net	2,895	3,079
Goodwill	4,024	37,513
Total assets	19,850	95,932
Current liabilities	1,645	6,077
Operating lease liability-net of current portion	2,328	2,389
Total liabilities	3,973	8,466
Purchase price	15,877	87,466
EnvStd
Business Acquisition [Line Items]
Cash	295
Accounts receivable and contract assets	4,876
Other current assets	456
Current assets	5,627
Property and equipment	168
Operating lease right-of-use asset-net	2,895
Goodwill	3,874
Total assets	19,650
Current liabilities	1,645
Operating lease liability-net of current portion	2,328
Total liabilities	3,973
Purchase price	15,677
IAG
Business Acquisition [Line Items]
Goodwill	150
Total assets	200
Purchase price	200
MSE Group
Business Acquisition [Line Items]
Cash		2,810
Accounts receivable		2,980
Other current assets		31
Current assets		5,821
Property and equipment		513
Operating lease right-of-use asset-net		740
Goodwill		8,176
Total assets		25,413
Current liabilities		1,007
Operating lease liability-net of current portion		548
Total liabilities		1,555
Purchase price		23,858
EI
Business Acquisition [Line Items]
Cash		250
Accounts receivable		4,675
Other current assets		84
Current assets		5,009
Property and equipment		32
Operating lease right-of-use asset-net		106
Goodwill		8,960
Total assets		25,687
Current liabilities		2,719
Operating lease liability-net of current portion		36
Total liabilities		2,755
Purchase price		22,932
Other Acquisitions
Business Acquisition [Line Items]
Cash		694
Accounts receivable		3,714
Other current assets		289
Current assets		4,697
Property and equipment		1,168
Operating lease right-of-use asset-net		2,233
Goodwill		20,377
Total assets		44,832
Current liabilities		2,351
Operating lease liability-net of current portion		1,805
Total liabilities		4,156
Purchase price		40,676
Customer Relationships
Business Acquisition [Line Items]
Intangible assets	5,807	31,623
Customer Relationships | EnvStd
Business Acquisition [Line Items]
Intangible assets	5,807
Customer Relationships | MSE Group
Business Acquisition [Line Items]
Intangible assets		8,720
Customer Relationships | EI
Business Acquisition [Line Items]
Intangible assets		10,073
Customer Relationships | Other Acquisitions
Business Acquisition [Line Items]
Intangible assets		12,830
Trade Names
Business Acquisition [Line Items]
Intangible assets	1,010	3,475
Trade Names | EnvStd
Business Acquisition [Line Items]
Intangible assets	1,010
Trade Names | MSE Group
Business Acquisition [Line Items]
Intangible assets		521
Trade Names | EI
Business Acquisition [Line Items]
Intangible assets		996
Trade Names | Other Acquisitions
Business Acquisition [Line Items]
Intangible assets		1,958
Covenants Not to Compete
Business Acquisition [Line Items]
Intangible assets	319	2,681
Covenants Not to Compete | EnvStd
Business Acquisition [Line Items]
Intangible assets	269
Covenants Not to Compete | IAG
Business Acquisition [Line Items]
Intangible assets	$ 50
Covenants Not to Compete | MSE Group
Business Acquisition [Line Items]
Intangible assets		922
Covenants Not to Compete | EI
Business Acquisition [Line Items]
Intangible assets		511
Covenants Not to Compete | Other Acquisitions
Business Acquisition [Line Items]
Intangible assets		1,248
Acquired Technology
Business Acquisition [Line Items]
Intangible assets		321
Acquired Technology | Other Acquisitions
Business Acquisition [Line Items]
Intangible assets		$ 321