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CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Statement [Abstract]      
Revenues (gross billings of $13.462 billion, $12.992 billion and $11.700 billion, less worksite employee payroll cost of $11.206 billion, $10.833 billion and $9.724 billion, respectively) $ 2,256,112 $ 2,158,824 $ 1,976,219
Direct costs:      
Payroll taxes, benefits and workers’ compensation costs 1,862,861 1,776,603 1,624,444
Gross profit 393,251 382,221 351,775
Operating expenses:      
Salaries, wages and payroll taxes 181,444 168,807 155,233
Stock-based compensation 11,103 9,814 8,601
Commissions 14,581 14,515 13,451
Advertising 23,795 21,586 26,613
General and administrative expenses 81,699 77,564 75,345
Impairment charge 3,342 4,191 0
Depreciation and amortization 21,064 18,250 15,218
Total operating expenses 337,028 314,727 294,461
Operating income 56,223 67,494 57,314
Other income (expense):      
Interest, net 158 609 969
Other, net (2,649) 187 (7,508)
Income before income tax expense 53,732 68,290 50,775
Income tax expense 21,700 27,888 20,305
Net income 32,032 40,402 30,470
Less distributed and undistributed earnings allocated to participating securities (916) (1,224) (908)
Net income allocated to common shares $ 31,116 $ 39,178 $ 29,562
Basic net income per share (in dollars per share) $ 1.25 $ 1.57 $ 1.16
Diluted net income per share of common stock (in dollars per share) $ 1.25 $ 1.56 $ 1.16