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CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Income Statement [Abstract]    
Revenues (gross billings of $4.564 billion and $3.940 billion less worksite employee payroll cost of $3.762 billion and $3.241 billion, respectively) $ 802,408 $ 699,479
Direct costs:    
Payroll taxes, benefits and workers’ compensation costs 652,392 569,619
Gross profit 150,016 129,860
Operating expenses:    
Salaries, wages and payroll taxes 58,015 56,748
Stock-based compensation 3,575 2,423
Commissions 4,281 4,304
Advertising 3,047 3,180
General and administrative expenses 23,784 24,593
Impairment charges and other 0 9,807
Depreciation and amortization 4,271 5,285
Total operating expenses 96,973 106,340
Operating income 53,043 23,520
Other income (expense):    
Interest income 299 107
Interest expense (637) (100)
Income before income tax expense 52,705 23,527
Income tax expense 20,012 9,740
Net income 32,693 13,787
Less distributed and undistributed earnings allocated to participating securities 664 355
Net income allocated to common shares $ 32,029 $ 13,432
Basic net income per share of common stock (in dollars per share) $ 1.53 $ 0.54
Diluted net income per share of common stock (in dollars per share) $ 1.53 $ 0.54