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CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Income Statement [Abstract]    
Revenues(1) $ 1,229,483 $ 1,153,010
Payroll taxes, benefits and workers’ compensation costs 995,461 926,293
Gross profit 234,022 226,717
Salaries, wages and payroll taxes 86,501 83,380
Stock-based compensation 6,552 6,040
Commissions 8,460 6,952
Advertising 4,833 5,031
General and administrative expenses 34,853 33,162
Depreciation and amortization 7,602 6,691
Total operating expenses 148,801 141,256
Operating income 85,221 85,461
Other income (expense):    
Interest income 1,879 3,245
Interest expense (2,362) (1,681)
Income before income tax expense 84,738 87,025
Income tax expense 22,646 10,736
Net income 62,092 76,289
Less distributed and undistributed earnings allocated to participating securities (462) (1,031)
Net income allocated to common shares $ 61,630 $ 75,258
Basic net income per share of common stock (in dollars per share) $ 1.59 $ 1.86
Diluted net income per share of common stock (in dollars per share) $ 1.58 $ 1.85
Revenue Composition [Abstract]    
Gross billings $ 7,436,754 $ 6,871,670
Worksite employee payroll cost 6,207,271 5,718,660
Revenues(1) $ 1,229,483 $ 1,153,010