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Business Acquisitions and Dispositions - Additional Information (Details) - USD ($) |  |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Aug. 23, 2021 | Nov. 01, 2020 | Jun. 12, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | [1]
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Goodwill |  |  |  | $ 85,696,000 |  | $ 85,696,000 |  | $ 66,537,000
Gain on disposition of businesses, net |  |  |  | 0 | $ (14,104,000) | 0 | $ 13,763,000 |
Loss on disposal of entity |  |  |  | 0 | $ (14,104,000) | 0 | $ 13,763,000 |
Lloyd Warwick International |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Gain on disposition of businesses, net |  |  |  | (600,000) |  | (14,700,000) |  |
Variable interest entity, ownership percentage |  |  | 51.00% |  |  |  |  |
Loss on disposal of entity |  |  |  | (600,000) |  | (14,700,000) |  |
Proceeds from sale of business |  |  | $ 19,600,000 |  |  |  |  |
Repayment of debt |  |  | $ 3,600,000 |  |  |  |  |
Working capital adjustments recognized under acquisition agreement |  |  |  | 700,000 |  | 700,000 |  |
Purchase price |  |  |  | 20,300,000 |  | 20,300,000 |  |
Gain on disposition, net of tax |  |  |  |  |  | $ 11,700,000 |  |
Diluted per share |  |  |  |  |  | $ 0.21 |  |
HBA Group |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Membership interest percentage |  | 100.00% |  |  |  |  |  |
Initial lump-sum payment of purchase price |  | $ 4,026,000 |  |  |  |  |  |
Business combination, net liabilities |  |  |  | 880,000 |  | $ 880,000 |  |
Business combination, definite-lived intangible assets |  |  |  | 1,574,000 |  | 1,574,000 |  |
Goodwill |  |  |  | 5,645,000 |  | $ 5,645,000 |  |
Weighted-average amortization period of intangible assets |  |  |  |  |  | 9 years |  |
Contingent consideration payable |  |  |  |  |  | $ 2,400,000 |  |
HBA Group | Maximum |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Payment to acquire business |  | $ 3,200,000 |  |  |  |  |  |
Edjuster Inc |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Membership interest percentage | 100.00% |  |  |  |  |  |  |
Initial lump-sum payment of purchase price | $ 21,000,000 |  |  |  |  |  |  |
Payment to acquire business | $ 14,000,000 |  |  |  |  |  |  |
Business combination, net assets |  |  |  | 1,834,000 |  | 1,834,000 |  |
Business combination, definite-lived intangible assets |  |  |  | 11,700,000 |  | 11,700,000 |  |
Goodwill |  |  |  | $ 9,670,000 |  | 9,670,000 |  |
Contingent consideration payable |  |  |  |  |  | $ 2,400,000 |  |
[1] | Derived from the audited Consolidated Balance Sheet

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