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CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Income Statement [Abstract]        
Revenues (gross billings of $3.236 billion, $3.068 billion, $9.736 billion and $9.339 billion, less worksite employee payroll cost of $2.696 billion, $2.556 billion, $8.037 billion and $7.712 billion, respectively) $ 539,869 $ 511,953 $ 1,698,979 $ 1,626,386
Direct costs:        
Payroll taxes, benefits and workers’ compensation costs 442,460 413,533 1,395,706 1,337,668
Gross profit 97,409 98,420 303,273 288,718
Operating expenses:        
Salaries, wages and payroll taxes 43,797 44,032 137,697 127,402
Stock-based compensation 2,749 2,429 8,351 7,385
Commissions 3,609 3,358 10,349 10,299
Advertising 4,273 3,680 19,243 17,001
General and administrative expenses 20,567 21,122 62,592 61,694
Depreciation and amortization 5,302 4,659 15,692 13,336
Total operating expenses 80,297 79,280 253,924 237,117
Operating income 17,112 19,140 49,349 51,601
Other income (expense):        
Interest, net 26 142 155 462
Other, net (1) (3) (2,668) 141
Income before income tax expense 17,137 19,279 46,836 52,204
Income tax expense 7,055 7,827 20,093 21,247
Net income 10,082 11,452 26,743 30,957
Less distributed and undistributed earnings allocated to participating securities (289) (334) (769) (898)
Net income allocated to common shares $ 9,793 $ 11,118 $ 25,974 $ 30,059
Basic net income per share of common stock (in dollars per share) $ 0.39 $ 0.45 $ 1.05 $ 1.20
Diluted net income per share of common stock (in dollars per share) $ 0.39 $ 0.45 $ 1.04 $ 1.20