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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