Business Acquisitions - Summary of Purchase Price Attributable to Acquisitions (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Business Acquisition [Line Items]
Cash	$ 781	$ 3,753
Accounts receivable and contract assets	7,046
Accounts receivable		11,788
Other current assets	475	404
Current assets	8,302	15,945
Property and equipment	179	1,713
Operating lease right-of-use asset-net	3,110	3,079
Goodwill	7,072	36,705
Total assets	29,108	95,542
Current liabilities	2,338	6,077
Operating lease liability-net of current portion	2,438	2,389
Total liabilities	4,776	8,466
Purchase price	24,332	87,076
EnvStd
Business Acquisition [Line Items]
Cash	295
Accounts receivable and contract assets	5,200
Other current assets	456
Current assets	5,951
Property and equipment	168
Operating lease right-of-use asset-net	2,895
Goodwill	4,107
Total assets	20,207
Current liabilities	1,719
Operating lease liability-net of current portion	2,328
Total liabilities	4,047
Purchase price	16,160
All Other 2022 Acquisitions
Business Acquisition [Line Items]
Cash	486
Accounts receivable and contract assets	1,846
Other current assets	19
Current assets	2,351
Property and equipment	11
Operating lease right-of-use asset-net	215
Goodwill	2,965
Total assets	8,901
Current liabilities	619
Operating lease liability-net of current portion	110
Total liabilities	729
Purchase price	8,172
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		693
Accounts receivable		4,133
Other current assets		289
Current assets		5,115
Property and equipment		1,168
Operating lease right-of-use asset-net		2,233
Goodwill		19,569
Total assets		44,442
Current liabilities		2,351
Operating lease liability-net of current portion		1,805
Total liabilities		4,156
Purchase price		40,286
Customer Relationships
Business Acquisition [Line Items]
Intangible assets	8,521	31,623
Customer Relationships | EnvStd
Business Acquisition [Line Items]
Intangible assets	5,807
Customer Relationships | All Other 2022 Acquisitions
Business Acquisition [Line Items]
Intangible assets	2,714
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	1,261	3,475
Trade Names | EnvStd
Business Acquisition [Line Items]
Intangible assets	1,010
Trade Names | All Other 2022 Acquisitions
Business Acquisition [Line Items]
Intangible assets	251
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	663	2,681
Covenants Not to Compete | EnvStd
Business Acquisition [Line Items]
Intangible assets	269
Covenants Not to Compete | All Other 2022 Acquisitions
Business Acquisition [Line Items]
Intangible assets	$ 394
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