XML 52 R23.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Accounts Receivable (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2021
Accounts Receivable Additional Disclosures [Abstract] |
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] | Accounts receivable, net consisted of the following:
| December 31,
(in thousands) | 2021 |  | 2020
Trade, net | $ | 10,522 |  |  | $ | 6,559 |
Unbilled | 490,533 |  |  | 380,819 |
Other | 12,251 |  |  | 5,368 |
Accounts receivable, net | $ | 513,306 |  |  | $ | 392,746 |
Unbilled accounts receivable | Client prepayments directly attributable to accrued worksite employee payroll costs and unbilled revenues have been netted as we have the legal right of offset for these amounts. Unbilled accounts receivable consisted of the following:
| December 31,
(in thousands) | 2021 |  | 2020
Accrued worksite employee payroll cost | $ | 409,653 |  |  | $ | 334,836 |
Unbilled revenues | 100,934 |  |  | 81,311 |
Client prepayments | (20,054) |  |  | (35,328) |
Unbilled accounts receivable | $ | 490,533 |  |  | $ | 380,819 |

X
- Definition Tabular disclosure of the various types of accounts receivable, including trade, unbilled and other, and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References No definition available. + Details
Name: | nsp_ScheduleOfAccountsUnbilledAndOtherReceivableTextBlock
Namespace Prefix: | nsp_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + 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 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration