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Business Acquisitions - Summary of Purchase Price Attributable to Acquisitions (Details) - USD ($) $ in Thousands | Jan. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Business Acquisition [Line Items] |  |
Cash |  | $ 1,527
Accounts receivable |  | 17,059
Other current assets |  | 1,265
Current assets |  | 19,851
Property and equipment |  | 7,117
Goodwill |  | 147,609
Total assets |  | 253,586
Current liabilities |  | 9,721
Total liabilities |  | 9,721
Purchase price |  | 243,865
Customer Relationships |  |
Business Acquisition [Line Items] |  |
Intangible assets |  | 56,000
Trade Names |  |
Business Acquisition [Line Items] |  |
Intangible assets |  | 4,200
Covenants Not to Compete |  |
Business Acquisition [Line Items] |  |
Intangible assets |  | 4,109
Proprietary Software |  |
Business Acquisition [Line Items] |  |
Intangible assets |  | 14,700
MSE Group |  |
Business Acquisition [Line Items] |  |
Cash | $ 2,810 |
Accounts receivable | 3,068 |
Other current assets | 31 |
Current assets | 5,909 |
Property and equipment | 513 |
Goodwill | 7,532 |
Total assets | 24,117 |
Current liabilities | 814 |
Total liabilities | 814 |
Purchase price | 23,303 |
MSE Group | Customer Relationships |  |
Business Acquisition [Line Items] |  |
Intangible assets | 8,720 |
MSE Group | Trade Names |  |
Business Acquisition [Line Items] |  |
Intangible assets | 521 |
MSE Group | Covenants Not to Compete |  |
Business Acquisition [Line Items] |  |
Intangible assets | $ 922 |
CTEH |  |
Business Acquisition [Line Items] |  |
Cash |  | 1,527
Accounts receivable |  | 17,059
Other current assets |  | 1,265
Current assets |  | 19,851
Property and equipment |  | 7,042
Goodwill |  | 146,983
Total assets |  | 252,776
Current liabilities |  | 9,721
Total liabilities |  | 9,721
Purchase price |  | 243,055
CTEH | Customer Relationships |  |
Business Acquisition [Line Items] |  |
Intangible assets |  | 56,000
CTEH | Trade Names |  |
Business Acquisition [Line Items] |  |
Intangible assets |  | 4,200
CTEH | Covenants Not to Compete |  |
Business Acquisition [Line Items] |  |
Intangible assets |  | 4,000
CTEH | Proprietary Software |  |
Business Acquisition [Line Items] |  |
Intangible assets |  | 14,700
All Other Acquisitions |  |
Business Acquisition [Line Items] |  |
Property and equipment |  | 75
Goodwill |  | 626
Total assets |  | 810
Purchase price |  | 810
All Other Acquisitions | Covenants Not to Compete |  |
Business Acquisition [Line Items] |  |
Intangible assets |  | $ 109

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