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GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS - Schedule of Acquired Intangible Assets (Exclusive of Assets Held for Sale) (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Goodwill [Line Items]    
Gross Carrying Amount $ 847,509 $ 916,186
Accumulated Amortization (545,432) (534,822)
Net Carrying Amount 302,077 381,364
Staffing databases    
Goodwill [Line Items]    
Gross Carrying Amount 52,336 52,336
Accumulated Amortization (42,569) (39,879)
Net Carrying Amount 9,767 12,457
Customer relationships    
Goodwill [Line Items]    
Gross Carrying Amount 467,321 532,048
Accumulated Amortization (231,074) (247,550)
Net Carrying Amount 236,247 284,498
Tradenames and trademarks    
Goodwill [Line Items]    
Gross Carrying Amount 282,168 284,488
Accumulated Amortization (228,515) (204,159)
Net Carrying Amount 53,653 80,329
Non-compete agreements    
Goodwill [Line Items]    
Gross Carrying Amount 9,399 9,399
Accumulated Amortization (8,471) (7,783)
Net Carrying Amount 928 1,616
Acquired technology    
Goodwill [Line Items]    
Gross Carrying Amount 36,285 37,915
Accumulated Amortization (34,803) (35,451)
Net Carrying Amount $ 1,482 $ 2,464