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Acquisitions of Businesses, 2021 Acquisition (Details)
$ in Thousands
12 Months Ended
Nov. 30, 2022
USD ($)
Clinic
Oct. 31, 2022
USD ($)
Clinic
Sep. 30, 2022
USD ($)
Clinic
Aug. 31, 2022
USD ($)
Clinic
Mar. 31, 2022
USD ($)
Clinic
Dec. 31, 2021
USD ($)
Clinic
Nov. 30, 2021
USD ($)
Sep. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
Clinic
Mar. 31, 2021
USD ($)
Clinic
Nov. 30, 2020
USD ($)
Clinic
Feb. 27, 2020
USD ($)
Clinic
Dec. 31, 2022
USD ($)
Clinic
Dec. 31, 2021
USD ($)
Clinic
Dec. 31, 2020
USD ($)
Business Combination, Description [Abstract]                              
Number of clinics | Clinic                         3 7  
Contingent payment consideration           $ 3,500             $ 8,300 $ 3,500  
Elimination of contingent consideration liability after revaluation                         $ 2,520 0 $ 0
IIPS [Member]                              
Business Combination, Description [Abstract]                              
Percentage of interest acquired             70.00%                
Number of clinics | Clinic                         2    
Aggregate purchase price for the acquisition             $ 63,200                
Contingent payment consideration [1]           2,520               2,520  
Cash paid for acquisition             60,700                
Seller notes           1,250 [1] $ 1,000             1,250 [1]  
Percentage of interest accrued             3.25%                
Remaining contract term                         5 years    
Ownership rights           $ 3,500               $ 3,522 [1]  
Elimination of contingent consideration liability after revaluation                         $ 2,000    
IIPS [Member] | Maximum [Member]                              
Business Combination, Description [Abstract]                              
Contingent payment consideration             $ 2,000                
Return-to-work and Ergonomic Services [Member]                              
Business Combination, Description [Abstract]                              
Aggregate purchase price for the acquisition               $ 2,700              
Contingent payment consideration               600              
Aggregate purchase price for the acquisition including contingent consideration               3,300              
Cash paid for acquisition               2,400              
Seller notes               $ 300              
Percentage of interest accrued               3.25%              
Elimination of contingent consideration liability after revaluation                         $ 600    
Clinic Practice [Member]                              
Business Combination, Description [Abstract]                              
Percentage of interest acquired 80.00% 60.00% 80.00% 70.00% 70.00% 75.00%     65.00% 70.00% 75.00% 65.00%   75.00%  
Number of clinics | Clinic 13 14 2 6 6 3     8 5 3 4      
Percentage of interest retained by practice founder 20.00% 40.00% 20.00% 30.00% 30.00% 25.00%               25.00%  
Aggregate purchase price for the acquisition $ 25,000 $ 19,500 $ 4,200 $ 3,500 $ 11,500 $ 3,700     $ 10,300 $ 12,000 $ 8,900 $ 11,900      
Contingent payment consideration 1,300 $ 8,300             800            
Cash paid for acquisition 24,200   3,900 3,300 11,200 3,500     9,000 11,700 8,600 11,600      
Amount payable upon achievement of certain business criteria                 1,000            
Seller notes $ 800   $ 300 $ 200 $ 300 $ 200     $ 300 $ 300 $ 300 $ 300   $ 200  
Percentage of interest accrued 7.00%   5.50% 5.50% 3.50% 3.25%     3.25% 3.25% 3.25% 4.75%   3.25%  
Clinic Practice [Member] | Maximum [Member]                              
Business Combination, Description [Abstract]                              
Percentage of interest acquired           35.00%           83.80% 35.00% 35.00% 35.00%
Clinic Practice [Member] | Previous Owners [Member]                              
Business Combination, Description [Abstract]                              
Percentage of retained interest by previous owners                 35.00% 30.00% 25.00%        
[1] *Industrial injury prevention services business