XML 49 R23.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Accounting Policies (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2018
Accounting Policies [Abstract] |
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:
| Year Ended December 31,
(in thousands) | 2018 | 2017 | 2016
Northeast | $ | 996,541 |  | $ | 854,629 |  | $ | 750,748 |
Southeast | 447,584 |  | 379,874 |  | 318,185 |
Central | 637,779 |  | 543,486 |  | 467,297 |
Southwest | 895,243 |  | 767,207 |  | 689,334 |
West | 797,942 |  | 702,619 |  | 664,308 |
| 3,775,089 |  | 3,247,815 |  | 2,889,872 |
Other revenue | 53,460 |  | 52,408 |  | 51,475 |
Total revenue | $ | 3,828,549 |  | $ | 3,300,223 |  | $ | 2,941,347 |
Property, Plant and Equipment [Table Text Block] | Property and equipment, net consisted of the following:
(in thousands) | December 31, 2018 |  | December 31, 2017 |
Land | $ | 6,215 |  | $ | 6,215 |
Buildings and improvements | 112,308 |  | 95,615 |
Computer hardware and software | 115,259 |  | 105,060 |
Software development costs | 71,332 |  | 60,568 |
Furniture, fixtures and other | 45,694 |  | 42,891 |
| 350,808 |  | 310,349 |
Accumulated depreciation and amortization | (233,595 | ) | (214,690 | )
Total property and equipment, net | $ | 117,213 |  | $ | 95,659 |
Estimated Useful Lives of Property and Equipment | The estimated useful lives of property and equipment for purposes of computing depreciation are as follows:
| Useful Life
Buildings and improvements | 5-30 years
Computer hardware and software | 2-5 years
Software development costs | 3-5 years
Furniture, fixtures and other | 5-7 years
Activity and Balances Related to Incurred But Not Paid Worker's Compensation Claims | The following table provides the activity and balances related to incurred but not paid workers’ compensation claims:
| Year Ended December 31,
(in thousands) | 2018 | 2017
Beginning balance | $ | 207,630 |  | $ | 183,928 |
Accrued claims | 72,066 |  | 68,194 |
Present value discount | (7,829 | ) | (4,308 | )
Paid claims | (42,228 | ) | (40,184 | )
Ending balance | $ | 229,639 |  | $ | 207,630 |
Current portion of accrued claims | $ | 42,227 |  | $ | 41,137 |
Long-term portion of accrued claims | 187,412 |  | 166,493 |
Total accrued claims | $ | 229,639 |  | $ | 207,630 |

X
- Definition Disclosure of the incurred but not yet paid workers' compensation claims activities and balances. + References No definition available. + Details
Name: | nsp_ScheduleOfAccruedWorkersCompensationClaimsTableTextBlock
Namespace Prefix: | nsp_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Disclosure of accounting policy for depreciation, depletion, and amortization of property and equipment costs, including methods used and estimated useful lives and how impairment of such assets is assessed and recognized. + References No definition available. + Details
Name: | us-gaap_DepreciationDepletionAndAmortizationPolicyTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_DisaggregationOfRevenueTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
Name: | us-gaap_PropertyPlantAndEquipmentTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration