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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Statement [Abstract]      
Revenues (gross billings of $17.933 billion, $15.806 billion and $14.187 billion, less worksite employee payroll cost of $14.992 billion, $13.202 billion and $11.829 billion, respectively) $ 2,941,347 $ 2,603,614 $ 2,357,788
Direct costs:      
Payroll taxes, benefits and workers’ compensation costs 2,449,737 2,165,747 1,953,983
Gross profit 491,610 437,867 403,805
Operating expenses:      
Salaries, wages and payroll taxes 229,589 211,060 200,118
Stock-based compensation 16,643 13,345 11,053
Commissions 19,288 18,479 15,285
Advertising 16,447 15,980 20,084
General and administrative expenses 86,693 84,259 84,717
Impairment charges and other 0 10,480 3,687
Depreciation and amortization 16,644 18,565 21,387
Total operating expenses 385,304 372,168 356,331
Operating income 106,306 65,699 47,474
Other income (expense):      
Interest Income, Other 1,267 379 523
Interest Expense (2,396) (459) (370)
Income before income tax expense 105,177 65,619 47,627
Income tax expense 39,186 26,229 19,623
Net income 65,991 39,390 28,004
Less distributed and undistributed earnings allocated to participating securities 1,496 981 2,002
Net income allocated to common shares $ 64,495 $ 38,409 $ 26,002
Basic net income per share of common stock (in dollars per share) $ 3.10 $ 1.58 $ 1.05
Diluted net income per share of common stock (in dollars per share) $ 3.09 $ 1.58 $ 1.05