$NSP
INSPERITY, INC. Stock $nsp

$nsp Overview Financials Valuation SEC Filings Company Website

2021 Q1 Form 10-Q Financial Statement

#000100075321000024 Filed on May 04, 2021

Income Statement

Concept	2021 Q1	2020 Q4	2020 Q1
Revenue	$1.287B	$1.056B	$1.229B
YoY Change	4.66%	-1.75%	6.63%
Cost Of Revenue	$1.035B	$888.8M	$995.5M
YoY Change	4.01%	-2.67%	7.47%
Gross Profit	$251.4M	$167.6M	$234.0M
YoY Change	7.45%	3.5%	3.22%
Gross Profit Margin	19.54%	15.87%	19.03%
Selling, General & Admin	$159.6M	$152.0M	$141.2M
YoY Change	13.03%	20.25%	4.9%
% of Gross Profit	63.47%	90.69%	60.34%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$8.000M	$7.900M	$7.600M
YoY Change	5.26%	1.28%	13.43%
% of Gross Profit	3.18%	4.71%	3.25%
Operating Expenses	$167.6M	$159.8M	$148.8M
YoY Change	12.65%	19.08%	5.34%
Operating Profit	$83.82M	$7.800M	$85.22M
YoY Change	-1.64%	-71.86%	-0.28%
Interest Expense	$1.599M	-$1.500M	$2.362M
YoY Change	-32.3%	650.0%	40.51%
% of Operating Profit	1.91%	-19.23%	2.77%
Other Income/Expense, Net
YoY Change
Pretax Income	$82.77M	$6.300M	$84.74M
YoY Change	-2.32%	-77.17%	-2.63%
Income Tax	$20.85M	$2.000M	$22.65M
% Of Pretax Income	25.19%	31.75%	26.72%
Net Earnings	$61.92M	$4.300M	$62.09M
YoY Change	-0.27%	-78.92%	-18.61%
Net Earnings / Revenue	4.81%	0.41%	5.05%
Basic Earnings Per Share	$1.62		$1.59
Diluted Earnings Per Share	$1.59	$112.9K	$1.58
COMMON SHARES
Basic Shares Outstanding	38.22M shares	38.35M shares	38.80M shares
Diluted Shares Outstanding	38.84M shares		39.07M shares

Balance Sheet

Concept	2021 Q1	2020 Q4	2020 Q1
SHORT-TERM ASSETS
Cash & Short-Term Investments	$529.1M	$589.4M	$424.2M
YoY Change	24.73%	46.58%	-6.25%
Cash & Equivalents	$494.8M	$554.8M	$404.7M
Short-Term Investments	$34.30M	$34.50M	$19.50M
Other Short-Term Assets	$53.72M	$39.46M	$40.43M
YoY Change	32.88%	-9.27%	10.4%
Inventory
Prepaid Expenses
Receivables	$561.2M	$6.559M	$520.7M
Other Receivables	$3.500M	$0.00	$0.00
Total Short-Term Assets	$1.252B	$1.077B	$1.079B
YoY Change	15.96%	10.52%	10.12%
LONG-TERM ASSETS
Property, Plant & Equipment	$220.3M	$216.3M	$160.3M
YoY Change	37.41%	46.41%	38.03%
Goodwill		$12.70M
YoY Change		0.0%
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets	$6.955M	$4.548M	$6.010M
YoY Change	15.72%	-23.88%	8.6%
Total Long-Term Assets	$517.6M	$507.0M	$443.1M
YoY Change	16.8%	20.64%	19.47%
TOTAL ASSETS
Total Short-Term Assets	$1.252B	$1.077B	$1.079B
Total Long-Term Assets	$517.6M	$507.0M	$443.1M
Total Assets	$1.769B	$1.584B	$1.522B
YoY Change	16.2%	13.57%	12.69%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$5.841M	$6.203M	$6.240M
YoY Change	-6.39%	35.88%	-20.55%
Accrued Expenses	$61.11M	$60.78M	$51.73M
YoY Change	18.13%	3.52%	5.05%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$1.044B	$904.9M	$888.5M
YoY Change	17.55%	4.13%	4.48%
LONG-TERM LIABILITIES
Long-Term Debt	$369.4M	$369.4M	$369.4M
YoY Change	0.0%	37.12%	155.82%
Other Long-Term Liabilities	$268.3M	$6.292M	$259.3M
YoY Change	3.47%
Total Long-Term Liabilities	$651.1M	$635.2M	$637.3M
YoY Change	2.17%	21.72%	67.09%
TOTAL LIABILITIES
Total Short-Term Liabilities	$1.044B	$904.9M	$888.5M
Total Long-Term Liabilities	$651.1M	$635.2M	$637.3M
Total Liabilities	$1.695B	$1.540B	$1.526B
YoY Change	11.12%	10.73%	23.86%
SHAREHOLDERS EQUITY
Retained Earnings	$620.2M	$575.0M	$545.3M
YoY Change	13.73%	15.13%	18.31%
Common Stock	$81.88M	$96.08M	$46.88M
YoY Change	74.66%	97.31%	36.33%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$628.4M	$627.0M	$595.5M
YoY Change	5.53%	15.23%	58.33%
Treasury Stock Shares		17.24M shares
Shareholders Equity	$73.64M	$44.13M	-$3.310M
YoY Change
Total Liabilities & Shareholders Equity	$1.769B	$1.584B	$1.522B
YoY Change	16.2%	13.57%	12.69%

Cashflow Statement

Concept	2021 Q1	2020 Q4	2020 Q1
OPERATING ACTIVITIES
Net Income	$61.92M	$4.300M	$62.09M
YoY Change	-0.27%	-78.92%	-18.61%
Depreciation, Depletion And Amortization	$8.000M	$7.900M	$7.600M
YoY Change	5.26%	1.28%	13.43%
Cash From Operating Activities	$1.971M	$239.8M	$23.79M
YoY Change	-91.71%	51.68%	-79.79%
INVESTING ACTIVITIES
Capital Expenditures	$12.07M	-$29.40M	$15.63M
YoY Change	-22.74%	44.83%	178.62%
Acquisitions
YoY Change
Other Investing Activities	$0.00	-$800.0K	$15.30M
YoY Change	-100.0%	-103.05%	109.59%
Cash From Investing Activities	-$12.08M	-$30.20M	-$314.0K
YoY Change	3746.18%	-611.86%	-118.33%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-$42.40M	-22.20M	$25.60M
YoY Change	-265.59%	-26.49%	-163.47%
NET CHANGE
Cash From Operating Activities	$1.971M	239.8M	$23.79M
Cash From Investing Activities	-$12.08M	-30.20M	-$314.0K
Cash From Financing Activities	-$42.40M	-22.20M	$25.60M
Net Change In Cash	-$52.50M	187.4M	$49.08M
YoY Change	-206.98%	40.06%	-37.94%
FREE CASH FLOW
Cash From Operating Activities	$1.971M	$239.8M	$23.79M
Capital Expenditures	$12.07M	-$29.40M	$15.63M
Free Cash Flow	-$10.10M	$269.2M	$8.162M
YoY Change	-223.76%	50.9%	-92.72%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2021Q1	dei	Entity Registrant Name EntityRegistrantName	INSPERITY, INC.
CY2021Q1	dei	Entity Central Index Key EntityCentralIndexKey	0001000753
CY2021Q1	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2021Q1	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2021
CY2021Q1	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q1
CY2021Q1	dei	Amendment Flag AmendmentFlag	false
CY2021Q2	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	38674991	shares
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	44132000	USD
CY2021Q1	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	29686000	USD
CY2021Q1	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	11822000	USD
CY2021Q1	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	240000	USD
CY2021Q1	us-gaap	Stockholders Equity Other StockholdersEquityOther	-682000	USD
CY2021Q1	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	15461000	USD
CY2021Q2	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	38674991	shares
CY2021Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-7000	USD
CY2021Q1	us-gaap	Net Income Loss NetIncomeLoss	61922000	USD
CY2021Q1	us-gaap	Stockholders Equity StockholdersEquity	73644000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	4079000	USD
CY2020Q1	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	61203000	USD
CY2020Q1	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	6552000	USD
CY2020Q1	us-gaap	Stockholders Equity Other StockholdersEquityOther	-642000	USD
CY2020Q1	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	15557000	USD
CY2020Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	85000	USD
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	62092000	USD
CY2020Q1	us-gaap	Stockholders Equity StockholdersEquity	-3310000	USD
CY2021Q1	nsp	Time Period Incurred Claims Expected To Be Paid Included In Deposits TimePeriodIncurredClaimsExpectedToBePaidIncludedInDeposits	Greater than 1 year
CY2021Q1	nsp	Time Period Estimate Of Incurred Claim Costs To Be Paid Included In Long Term Liabilities TimePeriodEstimateOfIncurredClaimCostsToBePaidIncludedInLongTermLiabilities	Greater than 1 year
CY2021Q1	nsp	Class Of Warrant Right Conversion Ratio Of Warrantor Rights To Share Of Stock ClassOfWarrantRightConversionRatioOfWarrantorRightsToShareOfStock	0.010	conversionRatio
CY2021Q1	dei	Document Type DocumentType	10-Q
CY2021Q1	dei	Document Quarterly Report DocumentQuarterlyReport	true
CY2021Q1	dei	Local Phone Number LocalPhoneNumber	358-8986
CY2021Q1	dei	Document Period End Date DocumentPeriodEndDate	2021-03-31
CY2021Q1	dei	Document Transition Report DocumentTransitionReport	false
CY2021Q1	dei	Entity File Number EntityFileNumber	1-13998
CY2021Q1	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2021Q1	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	76-0479645
CY2021Q1	dei	Entity Address Address Line1 EntityAddressAddressLine1	19001 Crescent Springs Drive
CY2021Q1	dei	Entity Address City Or Town EntityAddressCityOrTown	Kingwood,
CY2021Q1	dei	Entity Address State Or Province EntityAddressStateOrProvince	TX
CY2021Q1	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	77339
CY2021Q1	dei	City Area Code CityAreaCode	281
CY2021Q1	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2021Q1	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2021Q1	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2021Q1	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2021Q1	dei	Entity Small Business EntitySmallBusiness	false
CY2021Q1	dei	Entity Shell Company EntityShellCompany	false
CY2021Q1	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	494777000	USD
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	554846000	USD
CY2021Q1	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	46353000	USD
CY2020Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	45522000	USD
CY2021Q1	us-gaap	Marketable Securities Current MarketableSecuritiesCurrent	34292000	USD
CY2020Q4	us-gaap	Marketable Securities Current MarketableSecuritiesCurrent	34529000	USD
CY2021Q1	us-gaap	Receivables Net Current ReceivablesNetCurrent	561244000	USD
CY2020Q4	us-gaap	Receivables Net Current ReceivablesNetCurrent	392746000	USD
CY2021Q1	us-gaap	Prepaid Insurance PrepaidInsurance	57670000	USD
CY2020Q4	us-gaap	Prepaid Insurance PrepaidInsurance	10164000	USD
CY2021Q1	us-gaap	Other Assets Current OtherAssetsCurrent	53718000	USD
CY2020Q4	us-gaap	Other Assets Current OtherAssetsCurrent	39461000	USD
CY2021Q1	us-gaap	Nontrade Receivables NontradeReceivables	3451000	USD
CY2020Q4	us-gaap	Nontrade Receivables NontradeReceivables	0	USD
CY2021Q1	us-gaap	Assets Current AssetsCurrent	1251505000	USD
CY2020Q4	us-gaap	Assets Current AssetsCurrent	1077268000	USD
CY2021Q1	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	220262000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	216256000	USD
CY2021Q1	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	67688000	USD
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	60663000	USD
CY2021Q1	nsp	Prepaid Health Insurance Noncurrent PrepaidHealthInsuranceNoncurrent	9000000	USD
CY2020Q4	nsp	Prepaid Health Insurance Noncurrent PrepaidHealthInsuranceNoncurrent	9000000	USD
CY2021Q1	nsp	Deposits Health Insurance DepositsHealthInsurance	7900000	USD
CY2020Q4	nsp	Deposits Health Insurance DepositsHealthInsurance	7900000	USD
CY2021Q1	nsp	Deposits Workers Compensation DepositsWorkersCompensation	193067000	USD
CY2020Q4	nsp	Deposits Workers Compensation DepositsWorkersCompensation	186331000	USD
CY2021Q1	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	12707000	USD
CY2020Q4	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	12707000	USD
CY2021Q1	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	0	USD
CY2020Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	9603000	USD
CY2021Q1	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	6955000	USD
CY2020Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	4548000	USD
CY2021Q1	us-gaap	Assets Assets	1769084000	USD
CY2020Q4	us-gaap	Assets Assets	1584276000	USD
CY2021Q1	us-gaap	Accounts Payable Current AccountsPayableCurrent	5841000	USD
CY2020Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	6203000	USD
CY2021Q1	us-gaap	Accrued Payroll Taxes Current AccruedPayrollTaxesCurrent	310519000	USD
CY2020Q4	us-gaap	Accrued Payroll Taxes Current AccruedPayrollTaxesCurrent	377960000	USD
CY2021Q1	nsp	Accrued Worksite Employee Payroll Costs AccruedWorksiteEmployeePayrollCosts	503334000	USD
CY2020Q4	nsp	Accrued Worksite Employee Payroll Costs AccruedWorksiteEmployeePayrollCosts	334836000	USD
CY2021Q1	nsp	Accrued Health Insurance Costs AccruedHealthInsuranceCosts	72136000	USD
CY2020Q4	nsp	Accrued Health Insurance Costs AccruedHealthInsuranceCosts	32685000	USD
CY2021Q1	us-gaap	Workers Compensation Liability Current WorkersCompensationLiabilityCurrent	49696000	USD
CY2020Q4	us-gaap	Workers Compensation Liability Current WorkersCompensationLiabilityCurrent	48186000	USD
CY2021Q1	us-gaap	Accrued Salaries Current And Noncurrent AccruedSalariesCurrentAndNoncurrent	41720000	USD
CY2020Q4	us-gaap	Accrued Salaries Current And Noncurrent AccruedSalariesCurrentAndNoncurrent	44277000	USD
CY2021Q1	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	61105000	USD
CY2020Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	60777000	USD
CY2021Q1	us-gaap	Liabilities Current LiabilitiesCurrent	1044351000	USD
CY2020Q4	us-gaap	Liabilities Current LiabilitiesCurrent	904924000	USD
CY2021Q1	us-gaap	Workers Compensation Liability Noncurrent WorkersCompensationLiabilityNoncurrent	190336000	USD
CY2020Q4	us-gaap	Workers Compensation Liability Noncurrent WorkersCompensationLiabilityNoncurrent	195239000	USD
CY2021Q1	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	369400000	USD
CY2020Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	369400000	USD
CY2021Q1	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	71716000	USD
CY2020Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	64289000	USD
CY2021Q1	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	13343000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	0	USD
CY2021Q1	us-gaap	Other Accrued Liabilities Noncurrent OtherAccruedLiabilitiesNoncurrent	6294000	USD
CY2020Q4	us-gaap	Other Accrued Liabilities Noncurrent OtherAccruedLiabilitiesNoncurrent	6292000	USD
CY2021Q1	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	651089000	USD
CY2020Q4	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	635220000	USD
CY2021Q1	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2020Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2020Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1584276000	USD
CY2021Q1	us-gaap	Common Stock Value CommonStockValue	555000	USD
CY2020Q4	us-gaap	Common Stock Value CommonStockValue	555000	USD
CY2021Q1	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	81329000	USD
CY2020Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	95528000	USD
CY2021Q1	us-gaap	Treasury Stock Value TreasuryStockValue	628391000	USD
CY2020Q4	us-gaap	Treasury Stock Value TreasuryStockValue	626984000	USD
CY2021Q1	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	620151000	USD
CY2020Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	575033000	USD
CY2021Q1	us-gaap	Stockholders Equity StockholdersEquity	73644000	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	44132000	USD
CY2021Q1	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1769084000	USD
CY2021Q1	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1286835000	USD
CY2020Q1	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1229483000	USD
CY2021Q1	nsp	Payroll Taxes Benefits And Workers Compensation Costs PayrollTaxesBenefitsAndWorkersCompensationCosts	1035390000	USD
CY2020Q1	nsp	Payroll Taxes Benefits And Workers Compensation Costs PayrollTaxesBenefitsAndWorkersCompensationCosts	995461000	USD
CY2021Q1	us-gaap	Gross Profit GrossProfit	251445000	USD
CY2020Q1	us-gaap	Gross Profit GrossProfit	234022000	USD
CY2021Q1	nsp	Salaries Wages And Payroll Taxes SalariesWagesAndPayrollTaxes	103075000	USD
CY2020Q1	nsp	Salaries Wages And Payroll Taxes SalariesWagesAndPayrollTaxes	86501000	USD
CY2021Q1	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	11822000	USD
CY2020Q1	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	6552000	USD
CY2021Q1	us-gaap	Sales Commissions And Fees SalesCommissionsAndFees	7719000	USD
CY2020Q1	us-gaap	Sales Commissions And Fees SalesCommissionsAndFees	8460000	USD
CY2021Q1	us-gaap	Advertising Expense AdvertisingExpense	5322000	USD
CY2020Q1	us-gaap	Advertising Expense AdvertisingExpense	4833000	USD
CY2021Q1	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	31636000	USD
CY2020Q1	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	34853000	USD
CY2021Q1	us-gaap	Depreciation And Amortization DepreciationAndAmortization	8047000	USD
CY2020Q1	us-gaap	Depreciation And Amortization DepreciationAndAmortization	7602000	USD
CY2021Q1	us-gaap	Operating Expenses OperatingExpenses	167621000	USD
CY2020Q1	us-gaap	Operating Expenses OperatingExpenses	148801000	USD
CY2021Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	83824000	USD
CY2020Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	85221000	USD
CY2021Q1	us-gaap	Interest Income Other InterestIncomeOther	543000	USD
CY2020Q1	us-gaap	Interest Income Other InterestIncomeOther	1879000	USD
CY2021Q1	us-gaap	Interest Expense InterestExpense	1599000	USD
CY2020Q1	us-gaap	Interest Expense InterestExpense	2362000	USD
CY2021Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	82768000	USD
CY2020Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	84738000	USD
CY2021Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	20846000	USD
CY2020Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	22646000	USD
CY2021Q1	us-gaap	Net Income Loss NetIncomeLoss	61922000	USD
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	62092000	USD
CY2021Q1	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Diluted ParticipatingSecuritiesDistributedAndUndistributedEarningsLossDiluted	197000	USD
CY2020Q1	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Diluted ParticipatingSecuritiesDistributedAndUndistributedEarningsLossDiluted	462000	USD
CY2021Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	61725000	USD
CY2020Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	61630000	USD
CY2021Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.62
CY2020Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.59
CY2021Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.59
CY2020Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.58
CY2021Q1	nsp	Gross Billings GrossBillings	8050422000	USD
CY2020Q1	nsp	Gross Billings GrossBillings	7436754000	USD
CY2021Q1	nsp	Worksite Employee Payroll Cost WorksiteEmployeePayrollCost	6763587000	USD
CY2020Q1	nsp	Worksite Employee Payroll Cost WorksiteEmployeePayrollCost	6207271000	USD
CY2021Q1	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1286835000	USD
CY2020Q1	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1229483000	USD
CY2021Q1	us-gaap	Net Income Loss NetIncomeLoss	61922000	USD
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	62092000	USD
CY2021Q1	us-gaap	Depreciation And Amortization DepreciationAndAmortization	8047000	USD
CY2020Q1	us-gaap	Depreciation And Amortization DepreciationAndAmortization	7602000	USD
CY2021Q1	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	11822000	USD
CY2020Q1	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	6552000	USD
CY2021Q1	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	22946000	USD
CY2020Q1	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	12560000	USD
CY2021Q1	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	168498000	USD
CY2020Q1	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	54966000	USD
CY2021Q1	us-gaap	Increase Decrease In Prepaid Expense IncreaseDecreaseInPrepaidExpense	47506000	USD
CY2020Q1	us-gaap	Increase Decrease In Prepaid Expense IncreaseDecreaseInPrepaidExpense	35107000	USD
CY2021Q1	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	14257000	USD
CY2020Q1	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	-3068000	USD
CY2021Q1	us-gaap	Increase Decrease In Other Noncurrent Assets IncreaseDecreaseInOtherNoncurrentAssets	-1508000	USD
CY2020Q1	us-gaap	Increase Decrease In Other Noncurrent Assets IncreaseDecreaseInOtherNoncurrentAssets	-3403000	USD
CY2021Q1	us-gaap	Increase Decrease In Accounts Payable Trade IncreaseDecreaseInAccountsPayableTrade	-362000	USD
CY2020Q1	us-gaap	Increase Decrease In Accounts Payable Trade IncreaseDecreaseInAccountsPayableTrade	1675000	USD
CY2021Q1	us-gaap	Increase Decrease In Other Employee Related Liabilities IncreaseDecreaseInOtherEmployeeRelatedLiabilities	-67441000	USD
CY2020Q1	us-gaap	Increase Decrease In Other Employee Related Liabilities IncreaseDecreaseInOtherEmployeeRelatedLiabilities	-9003000	USD
CY2021Q1	nsp	Increase Decreasein Wse Epayrollexpense IncreaseDecreaseinWSEEpayrollexpense	168498000	USD
CY2020Q1	nsp	Increase Decreasein Wse Epayrollexpense IncreaseDecreaseinWSEEpayrollexpense	34905000	USD
CY2021Q1	us-gaap	Increase Decrease In Health Care Insurance Liabilities IncreaseDecreaseInHealthCareInsuranceLiabilities	39451000	USD
CY2020Q1	us-gaap	Increase Decrease In Health Care Insurance Liabilities IncreaseDecreaseInHealthCareInsuranceLiabilities	25661000	USD
CY2021Q1	us-gaap	Increase Decrease In Workers Compensation Liabilities IncreaseDecreaseInWorkersCompensationLiabilities	-3393000	USD
CY2020Q1	us-gaap	Increase Decrease In Workers Compensation Liabilities IncreaseDecreaseInWorkersCompensationLiabilities	3467000	USD
CY2021Q1	us-gaap	Increase Decrease In Accrued Salaries IncreaseDecreaseInAccruedSalaries	-5421000	USD
CY2020Q1	us-gaap	Increase Decrease In Accrued Salaries IncreaseDecreaseInAccruedSalaries	-46531000	USD
CY2021Q1	us-gaap	Increase Decrease In Income Taxes IncreaseDecreaseInIncomeTaxes	-5345000	USD
CY2020Q1	us-gaap	Increase Decrease In Income Taxes IncreaseDecreaseInIncomeTaxes	8409000	USD
CY2021Q1	us-gaap	Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities	-59951000	USD
CY2020Q1	us-gaap	Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities	-38305000	USD
CY2021Q1	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1971000	USD
CY2020Q1	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	23787000	USD
CY2021Q1	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	10585000	USD
CY2020Q1	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	8689000	USD
CY2021Q1	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	10580000	USD
CY2020Q1	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	24000000	USD
CY2021Q1	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	12072000	USD
CY2020Q1	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	15625000	USD
CY2021Q1	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-12077000	USD
CY2020Q1	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-314000	USD
CY2021Q1	nsp	Treasury Stock Acquired TreasuryStockAcquired	29686000	USD
CY2020Q1	nsp	Treasury Stock Acquired TreasuryStockAcquired	61203000	USD
CY2021Q1	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	15461000	USD
CY2020Q1	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	15557000	USD
CY2021Q1	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	0	USD
CY2020Q1	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	100000000	USD
CY2021Q1	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	2751000	USD
CY2020Q1	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	2363000	USD
CY2021Q1	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-42396000	USD
CY2020Q1	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	25603000	USD
CY2021Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	-52502000	USD
CY2020Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	49076000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	786699000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	592550000	USD
CY2021Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	734197000	USD
CY2020Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	641626000	USD
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	554846000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	367342000	USD
CY2020Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	45522000	USD
CY2019Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	49295000	USD
CY2020Q4	nsp	Deposits Workers Compensation DepositsWorkersCompensation	186331000	USD
CY2019Q4	nsp	Deposits Workers Compensation DepositsWorkersCompensation	175913000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	786699000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	592550000	USD
CY2021Q1	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	494777000	USD
CY2020Q1	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	404728000	USD
CY2021Q1	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	46353000	USD
CY2020Q1	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	48349000	USD
CY2021Q1	nsp	Deposits Workers Compensation DepositsWorkersCompensation	193067000	USD
CY2020Q1	nsp	Deposits Workers Compensation DepositsWorkersCompensation	188549000	USD
CY2021Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	734197000	USD
CY2020Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	641626000	USD
CY2021Q1	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	12104000	USD
CY2020Q1	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	6787000	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	44132000	USD
CY2021Q1	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	29686000	USD
CY2021Q1	us-gaap	Stock Issued During Period Value Share Based Compensation Gross StockIssuedDuringPeriodValueShareBasedCompensationGross	0	USD
CY2021Q1	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	11822000	USD
CY2021Q1	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	240000	USD
CY2021Q1	us-gaap	Stockholders Equity Other StockholdersEquityOther	-682000	USD
CY2021Q1	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	15461000	USD
CY2021Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-7000	USD
CY2021Q1	us-gaap	Net Income Loss NetIncomeLoss	61922000	USD
CY2021Q1	us-gaap	Stockholders Equity StockholdersEquity	73644000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	4079000	USD
CY2020Q1	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	61203000	USD
CY2020Q1	us-gaap	Stock Issued During Period Value Share Based Compensation Gross StockIssuedDuringPeriodValueShareBasedCompensationGross	0	USD
CY2020Q1	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	6552000	USD
CY2020Q1	us-gaap	Stockholders Equity Other StockholdersEquityOther	-642000	USD
CY2020Q1	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	15557000	USD
CY2020Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	85000	USD
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	62092000	USD
CY2020Q1	us-gaap	Stockholders Equity StockholdersEquity	-3310000	USD
CY2021Q1	nsp	Percentageofourhealthinsurancecoverageprovidedby United PercentageofourhealthinsurancecoverageprovidedbyUnited	0.87
CY2021Q1	nsp	Number Of Days In Advance Of Beginning Of Reporting Quarter Carrier Establishes Cash Funding Rates NumberOfDaysInAdvanceOfBeginningOfReportingQuarterCarrierEstablishesCashFundingRates	P90D
CY2021Q1	nsp	Prepaid Health Insurance Noncurrent PrepaidHealthInsuranceNoncurrent	9000000.0	USD
CY2021Q1	nsp	Required Deposit For Health Care Costs RequiredDepositForHealthCareCosts	6500000	USD
CY2021Q1	nsp	Prepaid Health Insurance Current And Noncurrent PrepaidHealthInsuranceCurrentAndNoncurrent	51400000	USD
CY2019Q4	nsp	Workers Compensation Maximum Economic Burden First Layer Of Claims Per Occurrence WorkersCompensationMaximumEconomicBurdenFirstLayerOfClaimsPerOccurrence	1500000	USD
CY2021Q1	nsp	Prepaid Health Insurance Noncurrent PrepaidHealthInsuranceNoncurrent	9000000.0	USD
CY2021Q1	nsp	Prepaid Health Insurance Current PrepaidHealthInsuranceCurrent	42400000	USD
CY2021Q1	nsp	Premiums Owed To United PremiumsOwedToUnited	66000000.0	USD
CY2021Q1	nsp	Benefits Costs Incurred Reduced Relatedto Runoff BenefitsCostsIncurredReducedRelatedtoRunoff	-5500000	USD
CY2020Q1	nsp	Benefits Costs Incurred Reduced Relatedto Runoff BenefitsCostsIncurredReducedRelatedtoRunoff	1500000	USD
CY2021Q1	nsp	Workers Compensation Maximum Economic Burden First Layer Of Claims Per Occurrence WorkersCompensationMaximumEconomicBurdenFirstLayerOfClaimsPerOccurrence	1000000	USD
CY2021Q1	nsp	Workers Compensation Maximum Economic Burden First Layer Of Claims Per Occurrence WorkersCompensationMaximumEconomicBurdenFirstLayerOfClaimsPerOccurrence	1000000	USD
CY2021Q1	nsp	Workers Compensation Maximum Aggregate Economic Burden For Claims In Excess Of First Layer Cap Per Policy Year WorkersCompensationMaximumAggregateEconomicBurdenForClaimsInExcessOfFirstLayerCapPerPolicyYear	6000000	USD
CY2021Q1	nsp	Workers Compensation Maximum Economic Burden First Layer Of Claims Per Occurrence WorkersCompensationMaximumEconomicBurdenFirstLayerOfClaimsPerOccurrence	1000000	USD
CY2019Q4	nsp	Workers Compensation Maximum Economic Burden First Layer Of Claims Per Occurrence WorkersCompensationMaximumEconomicBurdenFirstLayerOfClaimsPerOccurrence	1500000	USD
CY2019Q4	nsp	Workers Compensation Maximum Aggregate Economic Burden For Claims In Excess Of First Layer Cap Per Policy Year WorkersCompensationMaximumAggregateEconomicBurdenForClaimsInExcessOfFirstLayerCapPerPolicyYear	6000000	USD
CY2019Q4	nsp	Workers Compensation Maximum Economic Burden First Layer Of Claims Per Occurrence WorkersCompensationMaximumEconomicBurdenFirstLayerOfClaimsPerOccurrence	1500000	USD
CY2021Q1	nsp	Decrease Increase In Accrued Workers Compensation Costs For Changes In Estimated Losses DecreaseIncreaseInAccruedWorkersCompensationCostsForChangesInEstimatedLosses	13200000	USD
CY2020Q1	nsp	Decrease Increase In Accrued Workers Compensation Costs For Changes In Estimated Losses DecreaseIncreaseInAccruedWorkersCompensationCostsForChangesInEstimatedLosses	10100000	USD
CY2021Q1	nsp	Us Treasury Rates That Correspond With Weighted Average Estimated Claim Payout Period USTreasuryRatesThatCorrespondWithWeightedAverageEstimatedClaimPayoutPeriod	0.005
CY2020Q1	nsp	Us Treasury Rates That Correspond With Weighted Average Estimated Claim Payout Period USTreasuryRatesThatCorrespondWithWeightedAverageEstimatedClaimPayoutPeriod	0.010
CY2020Q4	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Opening Balance Adjustments LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseOpeningBalanceAdjustments	240761000	USD
CY2019Q4	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Opening Balance Adjustments LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseOpeningBalanceAdjustments	242904000	USD
CY2021Q1	nsp	Workers Compensation Expense WorkersCompensationExpense	8522000	USD
CY2020Q1	nsp	Workers Compensation Expense WorkersCompensationExpense	14339000	USD
CY2021Q1	nsp	Workers Compensation Discount Changed During Period WorkersCompensationDiscountChangedDuringPeriod	652000	USD
CY2020Q1	nsp	Workers Compensation Discount Changed During Period WorkersCompensationDiscountChangedDuringPeriod	-200000	USD
CY2021Q1	us-gaap	Payments For Losses And Loss Adjustment Expense PaymentsForLossesAndLossAdjustmentExpense	13246000	USD
CY2020Q1	us-gaap	Payments For Losses And Loss Adjustment Expense PaymentsForLossesAndLossAdjustmentExpense	11121000	USD
CY2021Q1	us-gaap	Workers Compensation Liability Current And Noncurrent WorkersCompensationLiabilityCurrentAndNoncurrent	236689000	USD
CY2020Q1	us-gaap	Workers Compensation Liability Current And Noncurrent WorkersCompensationLiabilityCurrentAndNoncurrent	245922000	USD
CY2021Q1	nsp	Workers Compensation Liability Net Of Admin Fees Current WorkersCompensationLiabilityNetOfAdminFeesCurrent	46353000	USD
CY2020Q1	nsp	Workers Compensation Liability Net Of Admin Fees Current WorkersCompensationLiabilityNetOfAdminFeesCurrent	48289000	USD
CY2021Q1	us-gaap	Workers Compensation Liability Noncurrent WorkersCompensationLiabilityNoncurrent	190336000	USD
CY2020Q1	us-gaap	Workers Compensation Liability Noncurrent WorkersCompensationLiabilityNoncurrent	197633000	USD
CY2021Q1	us-gaap	Workers Compensation Liability Current And Noncurrent WorkersCompensationLiabilityCurrentAndNoncurrent	236689000	USD
CY2020Q1	us-gaap	Workers Compensation Liability Current And Noncurrent WorkersCompensationLiabilityCurrentAndNoncurrent	245922000	USD
CY2021Q1	nsp	Workers Compensation Administrative Fees Accrued WorkersCompensationAdministrativeFeesAccrued	3300000	USD
CY2021Q1	nsp	Undiscounted Accrued Workers Compensation Costs UndiscountedAccruedWorkersCompensationCosts	253200000	USD
CY2020Q1	nsp	Undiscounted Accrued Workers Compensation Costs UndiscountedAccruedWorkersCompensationCosts	265600000	USD
CY2021Q1	nsp	Time Period Incurred Claims Expected To Be Paid Recorded As Restricted TimePeriodIncurredClaimsExpectedToBePaidRecordedAsRestricted	P1Y
CY2021Q1	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	46400000	USD
CY2021Q1	nsp	Deposits Workers Compensation DepositsWorkersCompensation	193100000	USD
CY2021Q1	nsp	Time Period Estimate Of Incurred Claim Costs To Be Paid Included In Short Term Liabilities TimePeriodEstimateOfIncurredClaimCostsToBePaidIncludedInShortTermLiabilities	P1Y
CY2021Q1	nsp	Unbilled Unbilled	549000000.0	USD
CY2020Q4	nsp	Unbilled Unbilled	380800000	USD
CY2021Q1	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1286835000	USD
CY2020Q1	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1229483000	USD
CY2020Q4	nsp	Client Prepayments Included In Cash Balance ClientPrepaymentsIncludedInCashBalance	-35300000	USD
CY2021Q1	nsp	Money Market Funds Overnight Holdings At Carrying Value MoneyMarketFundsOvernightHoldingsAtCarryingValue	432607000	USD
CY2020Q4	nsp	Money Market Funds Overnight Holdings At Carrying Value MoneyMarketFundsOvernightHoldingsAtCarryingValue	503221000	USD
CY2021Q1	us-gaap	Short Term Investments ShortTermInvestments	82570000	USD
CY2020Q4	us-gaap	Short Term Investments ShortTermInvestments	82521000	USD
CY2021Q1	us-gaap	Cash Cash	23105000	USD
CY2020Q4	us-gaap	Cash Cash	33692000	USD
CY2021Q1	srt	Drafts Payable DraftsPayable	9213000	USD
CY2020Q4	srt	Drafts Payable DraftsPayable	30059000	USD
CY2021Q1	us-gaap	Cash Cash Equivalents And Short Term Investments CashCashEquivalentsAndShortTermInvestments	529069000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents And Short Term Investments CashCashEquivalentsAndShortTermInvestments	589375000	USD
CY2021Q1	nsp	Payroll Withholdings Included In Cash Balance PayrollWithholdingsIncludedInCashBalance	273500000	USD
CY2020Q4	nsp	Payroll Withholdings Included In Cash Balance PayrollWithholdingsIncludedInCashBalance	342000000.0	USD
CY2021Q1	nsp	Client Prepayments Included In Cash Balance ClientPrepaymentsIncludedInCashBalance	-58900000	USD
CY2021Q1	us-gaap	Cash And Cash Equivalents Fair Value Disclosure CashAndCashEquivalentsFairValueDisclosure	480885000	USD
CY2020Q4	us-gaap	Cash And Cash Equivalents Fair Value Disclosure CashAndCashEquivalentsFairValueDisclosure	551213000	USD
CY2021Q1	us-gaap	Us Government Securities At Carrying Value USGovernmentSecuritiesAtCarryingValue	13269000	USD
CY2020Q4	us-gaap	Us Government Securities At Carrying Value USGovernmentSecuritiesAtCarryingValue	10531000	USD
CY2021Q1	us-gaap	Investments Fair Value Disclosure InvestmentsFairValueDisclosure	21023000	USD
CY2020Q4	us-gaap	Investments Fair Value Disclosure InvestmentsFairValueDisclosure	23998000	USD
CY2021Q1	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	515177000	USD
CY2020Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	585742000	USD
CY2021Q1	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	0	USD
CY2021Q1	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	34295000	USD
CY2021Q1	us-gaap	Available For Sale Securities Gross Unrealized Gains AvailableForSaleSecuritiesGrossUnrealizedGains	3000	USD
CY2021Q1	us-gaap	Available For Sale Securities Gross Unrealized Loss AvailableForSaleSecuritiesGrossUnrealizedLoss	6000	USD
CY2021Q1	us-gaap	Available For Sale Securities AvailableForSaleSecurities	34292000	USD
CY2020Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	34524000	USD
CY2020	us-gaap	Available For Sale Securities Gross Unrealized Gains AvailableForSaleSecuritiesGrossUnrealizedGains	9000	USD
CY2020	us-gaap	Available For Sale Securities Gross Unrealized Loss AvailableForSaleSecuritiesGrossUnrealizedLoss	4000	USD
CY2020Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	34529000	USD
CY2021Q1	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	34295000	USD
CY2021Q1	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	34292000	USD
CY2021Q1	nsp	Applicable Margin Federal Funds Rate ApplicableMarginFederalFundsRate	0.0050
CY2021Q1	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	0	USD
CY2021Q1	us-gaap	Line Of Credit Facility Current Borrowing Capacity LineOfCreditFacilityCurrentBorrowingCapacity	500000000	USD
CY2021Q1	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	550000000	USD
CY2021Q1	nsp	Percentage Of Subsidiary Stock Securing Debt PercentageOfSubsidiaryStockSecuringDebt	0.65
CY2021Q1	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	369400000	USD
CY2021Q1	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	1000000.0	USD
CY2021Q1	us-gaap	Line Of Credit Facility Remaining Borrowing Capacity LineOfCreditFacilityRemainingBorrowingCapacity	129600000	USD
CY2021Q1	nsp	Applicable Margin30 Day Libor ApplicableMargin30DayLibor	0.0200
CY2021Q1	us-gaap	Line Of Credit Facility Unused Capacity Commitment Fee Percentage LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage	0.0025
CY2021Q1	us-gaap	Line Of Credit Facility Interest Rate During Period LineOfCreditFacilityInterestRateDuringPeriod	0.0188
CY2021Q1	nsp	Aggregatenumberofsharesrepurchasedduringtheperiod Aggregatenumberofsharesrepurchasedduringtheperiod	340317	shares
CY2021Q1	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	49904	shares
CY2021Q1	us-gaap	Stock Repurchase Program Remaining Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased	1078233	shares
CY2021Q1	us-gaap	Shares Paid For Tax Withholding For Share Based Compensation SharesPaidForTaxWithholdingForShareBasedCompensation	290413	shares
CY2021Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.40
CY2020Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.40
CY2021Q1	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	15500000	USD
CY2020Q1	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	15600000	USD
CY2021Q1	us-gaap	Class Of Warrant Or Right Reason For Issuing To Nonemployees ClassOfWarrantOrRightReasonForIssuingToNonemployees	Rights PlanOn May 21, 2020, the Board declared a dividend of one right (“Right”) for each outstanding share of common stock to common stockholders of record at the close of business on June 1, 2020 (the “Rights Plan”). Each Right, if and when it becomes exercisable, entitles the registered holder to purchase from us one unit consisting of one one-hundredth of a share of Series A Junior Participating Preferred Stock, par value $0.01 per share. Initially, the Rights are attached to all outstanding shares of our common stock. The Rights are not currently exercisable and the Rights Plan will expire at the close of business on May 20, 2021, unless the Rights are earlier redeemed or exchanged by us.
CY2021Q1	us-gaap	Class Of Warrant Or Right Number Of Securities Called By Each Warrant Or Right ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight	1	shares
CY2021Q1	us-gaap	Warrants And Rights Outstanding Maturity Date WarrantsAndRightsOutstandingMaturityDate	2021-05-20
CY2021Q1	us-gaap	Net Income Loss NetIncomeLoss	61922000	USD
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	62092000	USD
CY2021Q1	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Diluted ParticipatingSecuritiesDistributedAndUndistributedEarningsLossDiluted	197000	USD
CY2020Q1	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Diluted ParticipatingSecuritiesDistributedAndUndistributedEarningsLossDiluted	462000	USD
CY2021Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	61725000	USD
CY2020Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	61630000	USD
CY2021Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	38216000	shares
CY2020Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	38802000	shares
CY2021Q1	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	623000	shares
CY2020Q1	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	266000	shares
CY2021Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	38839000	shares
CY2020Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	39068000	shares
CY2021Q1	us-gaap	Loss Contingency Damages Sought Value LossContingencyDamagesSoughtValue	146000000	USD
CY2021Q1	us-gaap	Loss Contingency Accrual Provision LossContingencyAccrualProvision	0	USD

Files In Submission

Name	View Source	Status
0001000753-21-000024-index-headers.html	Edgar Link	pending
0001000753-21-000024-index.html	Edgar Link	pending
0001000753-21-000024.txt	Edgar Link	pending
0001000753-21-000024-xbrl.zip	Edgar Link	pending
a03312021-ex102.htm	Edgar Link	pending
a03312021-ex103.htm	Edgar Link	pending
a03312021-nspex311.htm	Edgar Link	pending
a03312021-nspex312.htm	Edgar Link	pending
a03312021-nspex321.htm	Edgar Link	pending
a03312021-nspex322.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
MetaLinks.json	Edgar Link	pending
nsp-20210331.htm	Edgar Link	pending
nsp-20210331.xsd	Edgar Link	pending
nsp-20210331_cal.xml	Edgar Link	unprocessable
nsp-20210331_def.xml	Edgar Link	unprocessable
nsp-20210331_g1.jpg	Edgar Link	pending
nsp-20210331_g10.jpg	Edgar Link	pending
nsp-20210331_g11.jpg	Edgar Link	pending
nsp-20210331_g2.jpg	Edgar Link	pending
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nsp-20210331_g6.jpg	Edgar Link	pending
nsp-20210331_g7.jpg	Edgar Link	pending
nsp-20210331_g8.jpg	Edgar Link	pending
nsp-20210331_g9.jpg	Edgar Link	pending
nsp-20210331_htm.xml	Edgar Link	completed
nsp-20210331_lab.xml	Edgar Link	unprocessable
nsp-20210331_pre.xml	Edgar Link	unprocessable
R1.htm	Edgar Link	pending
R10.htm	Edgar Link	pending
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R7.htm	Edgar Link	pending
R8.htm	Edgar Link	pending
R9.htm	Edgar Link	pending
report.css	Edgar Link	pending
Show.js	Edgar Link	pending

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$NSP
INSPERITY, INC. Stock $nsp

2021 Q1 Form 10-Q Financial Statement

#000100075321000024 Filed on May 04, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$NSP INSPERITY, INC. Stock $nsp

2021 Q1 Form 10-Q Financial Statement

#000100075321000024 Filed on May 04, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$NSP
INSPERITY, INC. Stock $nsp