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Goodwill and Intangible Assets - Changes in Carrying Amount of Goodwill (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Goodwill [Line Items]    
Goodwill   $ 1,134,635
Accumulated impairment losses   (455,892)
Goodwill $ 684,909 678,743
Goodwill recorded in connection with business acquisitions 6,133  
Foreign currency translation 33  
Healthcare    
Goodwill [Line Items]    
Goodwill   643,552
Accumulated impairment losses   (190,024)
Goodwill 453,528 453,528
Goodwill recorded in connection with business acquisitions 0  
Foreign currency translation 0  
Education    
Goodwill [Line Items]    
Goodwill   145,981
Accumulated impairment losses   (1,417)
Goodwill 150,730 144,564
Goodwill recorded in connection with business acquisitions 6,133  
Foreign currency translation 33  
Commercial:    
Goodwill [Line Items]    
Goodwill   345,102
Accumulated impairment losses   (264,451)
Goodwill 80,651 $ 80,651
Goodwill recorded in connection with business acquisitions 0  
Foreign currency translation $ 0