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Other Balance Sheet Information (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Cash and Cash Equivalents [Line Items]        
Overnight Holdings $ 931,000 $ 611,000    
Short-term Investments 133,000 135,000    
Cash 27,000 27,000    
Drafts Payable (36,000) (64,000)    
Cash, Cash Equivalents, and Short-term Investments 1,055,000 709,000    
Payroll Withholdings Included in Cash Balance 830,000 510,000    
Client Prepayments Included in Cash Balance (91,000) (28,000)    
ERCFundsReceivedIncludedInCashBalance 440,000      
Cash and cash equivalents 1,039,000 693,000 $ 733,000 $ 576,000
Restricted cash 69,000 57,000 50,000 47,000
Funds Held for Clients 58,000 87,000 35,000 32,000
Deposits workers compensation 178,000 198,000 196,000 185,000
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Total 1,344,000 1,035,000 1,014,000 840,000
Supplemental cash flow information:        
Restricted cash 69,000 57,000 50,000 47,000
Funds Held for Clients 58,000 87,000 35,000 32,000
Deposits workers compensation 178,000 198,000 196,000 185,000
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Total 1,344,000 1,035,000 $ 1,014,000 $ 840,000
Money Market Funds [Member]        
Cash and Cash Equivalents [Line Items]        
Overnight Holdings 0 0    
Short-term Investments 16,000 16,000    
Cash 0 0    
Drafts Payable 0 0    
Cash, Cash Equivalents, and Short-term Investments 16,000 16,000    
Cash and Cash Equivalents [Member]        
Cash and Cash Equivalents [Line Items]        
Overnight Holdings 931,000 611,000    
Short-term Investments 117,000 119,000    
Cash 27,000 27,000    
Drafts Payable (36,000) (64,000)    
Cash, Cash Equivalents, and Short-term Investments $ 1,039,000 $ 693,000