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Accounting Policies (Tables) | 9 Months Ended
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Sep. 30, 2018
Accounting Policies [Abstract] |
Activity and balances related to incurred but not paid workers' compensation claims | The following table provides the activity and balances related to incurred but not paid workers’ compensation claims:
| Nine Months Ended September 30,
(in thousands) | 2018 |  | 2017
Beginning balance, January 1, | $ | 207,630 |  |  | $ | 183,928 |
Accrued claims | 54,744 |  |  | 52,133 |
Present value discount | (5,372 | ) |  | (3,048 | )
Paid claims | (31,645 | ) |  | (29,574 | )
Ending balance | $ | 225,357 |  |  | $ | 203,439 |
Current portion of accrued claims | $ | 42,258 |  |  | $ | 41,748 |
Long-term portion of accrued claims | 183,099 |  |  | 161,691 |
Total accrued claims | $ | 225,357 |  |  | $ | 203,439 |
Disaggregation of Revenue [Table Text Block] | Our revenue for our PEO HR Outsourcing solutions by geographic region and for our other products and services offerings are as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
(in thousands) | 2018 | 2017 | % Change |  | 2018 | 2017 | % Change
Northeast | $ | 237,076 |  | $ | 204,318 |  | 16.0 | % |  | $ | 748,717 |  | $ | 644,703 |  | 16.1 | %
Southeast | 109,552 |  | 92,646 |  | 18.2 | % |  | 333,004 |  | 283,501 |  | 17.5 | %
Central | 155,184 |  | 131,978 |  | 17.6 | % |  | 476,277 |  | 405,854 |  | 17.4 | %
Southwest | 217,946 |  | 184,572 |  | 18.1 | % |  | 664,731 |  | 573,773 |  | 15.9 | %
West | 192,011 |  | 169,321 |  | 13.4 | % |  | 599,617 |  | 527,217 |  | 13.7 | %
| 911,769 |  | 782,835 |  | 16.5 | % |  | 2,822,346 |  | 2,435,048 |  | 15.9 | %
Other revenue | 13,357 |  | 12,678 |  | 5.4 | % |  | 39,447 |  | 38,681 |  | 2.0 | %
Total revenue | $ | 925,126 |  | $ | 795,513 |  | 16.3 | % |  | $ | 2,861,793 |  | $ | 2,473,729 |  | 15.7 | %

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- Definition Disclosure of the incurred but not yet paid workers' compensation claims activities and balances. + References No definition available. + Details
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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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