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Goodwill and Intangible Assets - Changes in Carrying Amount of Goodwill (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Goodwill [Line Items]      
Goodwill $ 1,134,635 $ 1,081,603 $ 1,080,858
Accumulated impairment losses (455,892) (455,892) (455,892)
Goodwill recorded in connection with business combinations 55,479 745  
Goodwill, Written off Related to Sale of Business Unit (2,300)    
Goodwill, Foreign Currency Translation Gain (Loss) (147)    
Goodwill, net beginning balance 625,711 624,966  
Goodwill 678,743 625,711 624,966
Loss on disposal 4,309 0 0
Education [Member]      
Goodwill [Line Items]      
Goodwill 145,981 123,652 123,652
Accumulated impairment losses (1,417) (1,417) (1,417)
Goodwill recorded in connection with business combinations 22,476 0  
Goodwill, Written off Related to Sale of Business Unit 0    
Goodwill, Foreign Currency Translation Gain (Loss) (147)    
Goodwill, net beginning balance 122,235 122,235  
Goodwill 144,564 122,235 122,235
Commercial      
Goodwill [Line Items]      
Goodwill 345,102 312,968 312,968
Accumulated impairment losses (264,451) (264,451) (264,451)
Goodwill recorded in connection with business combinations 32,134 0  
Goodwill, Written off Related to Sale of Business Unit 0    
Goodwill, Foreign Currency Translation Gain (Loss) 0    
Goodwill, net beginning balance 48,517 48,517  
Goodwill 80,651 48,517 48,517
Healthcare      
Goodwill [Line Items]      
Goodwill 643,552 644,983 644,238
Accumulated impairment losses (190,024) (190,024) (190,024)
Goodwill recorded in connection with business combinations 869 745  
Goodwill, Foreign Currency Translation Gain (Loss) 0    
Goodwill, net beginning balance 454,959 454,214  
Goodwill 453,528 $ 454,959 $ 454,214
Healthcare | Studer Education      
Goodwill [Line Items]      
Goodwill, Written off Related to Sale of Business Unit (2,300)    
Loss on disposal $ 3,600