v3.26.1
GOODWILL - Summary of Changes in Carrying Amount of Goodwill by Operating Segment (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Intangible Asset, Finite-Lived [Line Items]    
Gross $ 2,425,256 $ 2,413,786
Accumulated impairment (83,987) (83,987)
Goodwill [Roll Forward]    
Beginning balance, Goodwill 2,329,799  
Additions 11,470  
Transfer - Gross goodwill 0  
Transfer - Accumulated impairment 0  
Ending balance, Goodwill 2,341,269  
Financial Services    
Intangible Asset, Finite-Lived [Line Items]    
Gross 2,085,018 2,039,675
Accumulated impairment (76,254) (44,047)
Goodwill [Roll Forward]    
Beginning balance, Goodwill 1,995,628  
Additions 11,470  
Transfer - Gross goodwill 33,873  
Transfer - Accumulated impairment (32,207)  
Ending balance, Goodwill 2,008,764  
Benefits and Insurance Services    
Intangible Asset, Finite-Lived [Line Items]    
Gross 340,238 340,238
Accumulated impairment (7,733) (7,733)
Goodwill [Roll Forward]    
Beginning balance, Goodwill 332,505  
Additions 0  
Transfer - Gross goodwill 0  
Transfer - Accumulated impairment 0  
Ending balance, Goodwill 332,505  
National Practice    
Intangible Asset, Finite-Lived [Line Items]    
Gross 0 33,873
Accumulated impairment 0 $ (32,207)
Goodwill [Roll Forward]    
Beginning balance, Goodwill 1,666  
Additions 0  
Transfer - Gross goodwill (33,873)  
Transfer - Accumulated impairment 32,207  
Ending balance, Goodwill $ 0