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Summary of Operations and Significant Accounting Policies - Additional Information (Detail)
 12 Months Ended
Jun. 04, 2024
$ / shares
shares
Jun. 03, 2024
shares
Dec. 31, 2023
USD ($)
$ / shares
shares
Dec. 31, 2024
USD ($)
Company
Segment
Market
$ / shares
shares
Dec. 31, 2023
USD ($)
$ / shares
shares
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Basis Of Presentation Of Interim Period Statements [Line Items]              
Number of markets | Market       67      
Stock split, description       On June 4, 2024, we amended our Charter to increase the number of authorized shares of common stock from 20,500,000 shares to 82,000,000 shares, and our Board of Directors declared a four-for-one split of the Company’s common stock effected in the form of a stock dividend (the “2024 Stock Split”). Each stockholder of record at the close of business on June 14, 2024 received a dividend of three additional shares of common stock for each then-held share, distributed after close of trading on June 21, 2024.      
Stock split, conversion ratio 0.25 0.25   0.25      
Common stock, shares authorized | shares 82,000,000 20,500,000 82,000,000 82,000,000 82,000,000    
Common stock, par value | $ / shares $ 0.01   $ 0.01 $ 0.01 $ 0.01    
Number of operating segment | Segment       1      
Description of clients individual representation on total revenue       None of our clients individually represented more than 1% of our total revenues in 2024.      
Revenue recognition professional employer service contracts term       1 year      
Professional employer service contract cancellation and termination period       30 days      
Payment term for staffing customers       30 days      
Number of wholly-owned insurance companies | Company       2      
Cash and cash equivalents, maturity term       3 months      
Interest income       $ 10,900,000 $ 9,100,000 $ 6,800,000  
Payroll weekly payment term       30 days      
Unbilled receivables     $ 157,900,000 $ 218,800,000 157,900,000    
Remaining trade accounts receivable     14,400,000 16,600,000 14,400,000    
Allowance for expected credit losses     885,000 885,000 885,000 893,000 $ 460,000
Goodwill and intangible assets impairment       0      
Impairment of long lived asset       0      
Income taxes paid       14,900,000 22,200,000 21,000,000.0  
Accrued payroll, payroll taxes and related benefits     234,100,000   234,100,000    
Accrued payroll and related benefits     160,930,000 215,648,000 160,930,000    
Payroll taxes payable     73,200,000   73,200,000    
Net cash inflows from accrued payroll, payroll taxes and related benefit         12,700,000 24,900,000  
Net cash inflows related to accrued payroll and related benefits         5,700,000 12,200,000  
Net cash inflows related to payroll taxes payable       $ (23,465,000) 7,030,000 12,697,000  
Prior period reclassification adjustment         $ 800,000 $ 2,300,000  
Additional Paid-in Capital [Member]              
Basis Of Presentation Of Interim Period Statements [Line Items]              
Prior period reclassification adjustment     200,000        
Safety Incentive Liability [Member]              
Basis Of Presentation Of Interim Period Statements [Line Items]              
Prior period reclassification adjustment     $ 1,300,000        
Minimum [Member]              
Basis Of Presentation Of Interim Period Statements [Line Items]              
Likelihood of tax benefit being realized upon settlement       50.00%      
California [Member] | Revenue [Member] | Geographic Concentration Risk [Member]              
Basis Of Presentation Of Interim Period Statements [Line Items]              
Percentage of revenue attributable to geographic area       72.00% 72.00% 73.00%