<?xml version="1.0" encoding="utf-8"?>
<xbrl
  xml:lang="en-US"
  xmlns="http://www.xbrl.org/2003/instance"
  xmlns:dei="http://xbrl.sec.gov/dei/2025"
  xmlns:ffd="http://xbrl.sec.gov/ffd/2025"
  xmlns:iso4217="http://www.xbrl.org/2003/iso4217"
  xmlns:link="http://www.xbrl.org/2003/linkbase"
  xmlns:xbrldi="http://xbrl.org/2006/xbrldi"
  xmlns:xlink="http://www.w3.org/1999/xlink">
    <link:schemaRef
      xlink:href="https://xbrl.sec.gov/ffd/2025/ffd-2025.xsd"
      xlink:type="simple"/>
    <context id="c-1">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001000753</identifier>
        </entity>
        <period>
            <startDate>2025-08-01</startDate>
            <endDate>2025-08-01</endDate>
        </period>
    </context>
    <context id="c-2">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001000753</identifier>
            <segment>
                <xbrldi:typedMember dimension="ffd:OfferingAxis">
                    <dei:lineNo>1</dei:lineNo>
                </xbrldi:typedMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-08-01</startDate>
            <endDate>2025-08-01</endDate>
        </period>
    </context>
    <unit id="shares">
        <measure>shares</measure>
    </unit>
    <unit id="usd">
        <measure>iso4217:USD</measure>
    </unit>
    <unit id="number">
        <measure>pure</measure>
    </unit>
    <dei:EntityCentralIndexKey contextRef="c-1" id="f-16">0001000753</dei:EntityCentralIndexKey>
    <ffd:SubmissnTp contextRef="c-1" id="f-17">S-8</ffd:SubmissnTp>
    <ffd:FeeExhibitTp contextRef="c-1" id="f-18">EX-FILING FEES</ffd:FeeExhibitTp>
    <ffd:PrevslyPdFlg contextRef="c-2" id="f-19">false</ffd:PrevslyPdFlg>
    <ffd:FormTp contextRef="c-1" id="f-1">S-8</ffd:FormTp>
    <dei:EntityRegistrantName contextRef="c-1" id="f-2">Insperity, Inc.</dei:EntityRegistrantName>
    <ffd:OfferingSctyTp contextRef="c-2" id="f-3">Equity</ffd:OfferingSctyTp>
    <ffd:OfferingSctyTitl contextRef="c-2" id="f-4">Common stock, par value $0.01 per share</ffd:OfferingSctyTitl>
    <ffd:FeesOthrRuleFlg contextRef="c-2" id="f-5">true</ffd:FeesOthrRuleFlg>
    <ffd:AmtSctiesRegd contextRef="c-2" decimals="0" id="f-6" unitRef="shares">620000</ffd:AmtSctiesRegd>
    <ffd:MaxOfferingPricPerScty contextRef="c-2" decimals="2" id="f-7" unitRef="usd">59.97</ffd:MaxOfferingPricPerScty>
    <ffd:MaxAggtOfferingPric contextRef="c-2" decimals="0" id="f-8" unitRef="usd">37181400</ffd:MaxAggtOfferingPric>
    <ffd:FeeRate contextRef="c-2" decimals="INF" id="f-9" unitRef="number">0.00015310</ffd:FeeRate>
    <ffd:FeeAmt contextRef="c-2" decimals="2" id="f-10" unitRef="usd">5692.47</ffd:FeeAmt>
    <ffd:TtlOfferingAmt contextRef="c-1" decimals="0" id="f-11" unitRef="usd">37181400</ffd:TtlOfferingAmt>
    <ffd:TtlFeeAmt contextRef="c-1" decimals="2" id="f-12" unitRef="usd">5692.47</ffd:TtlFeeAmt>
    <ffd:TtlOffsetAmt contextRef="c-1" decimals="INF" id="f-13" unitRef="usd">0</ffd:TtlOffsetAmt>
    <ffd:NetFeeAmt contextRef="c-1" decimals="2" id="f-14" unitRef="usd">5692.47</ffd:NetFeeAmt>
    <ffd:OfferingNote contextRef="c-2" id="f-15">&lt;div style="padding-left:36pt;text-indent:-18pt"&gt;&lt;span style="color:#000000;font-family:'Times New Roman',serif;font-size:6.5pt;font-weight:400;line-height:120%;position:relative;top:-3.5pt;vertical-align:baseline"&gt;(1)&lt;/span&gt;&lt;span style="color:#000000;font-family:'Times New Roman',serif;font-size:10pt;font-weight:400;line-height:120%;padding-left:10.43pt"&gt;Amount Registered represents the aggregate additional number of shares of the registrant&#x2019;s common stock, par value $0.01 per share, reserved for issuance under the Insperity, Inc. Incentive Plan.&lt;/span&gt;&lt;/div&gt;&lt;div&gt;&lt;span&gt;&lt;br/&gt;&lt;/span&gt;&lt;/div&gt;&lt;div style="padding-left:36pt;text-indent:22.5pt"&gt;&lt;span style="color:#000000;font-family:'Times New Roman',serif;font-size:10pt;font-weight:400;line-height:120%"&gt;Proposed Maximum Offering Price Per Unit estimated solely for the purpose of calculating the registration fee pursuant to Rule 457(c) and (h) under the Securities Act of 1933, as amended. Represents the average high and low prices per share of the registrant&#x2019;s common stock as reported on the New York Stock Exchange on July 25, 2025.&lt;/span&gt;&lt;/div&gt;</ffd:OfferingNote>
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