<?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/2021q4"
  xmlns:link="http://www.xbrl.org/2003/linkbase"
  xmlns:xlink="http://www.w3.org/1999/xlink">
    <link:schemaRef xlink:href="whg-20230210.xsd" xlink:type="simple"/>
    <context id="i8acb3a35a3ec444fa789def99f3888e8_D20230210-20230210">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001165002</identifier>
        </entity>
        <period>
            <startDate>2023-02-10</startDate>
            <endDate>2023-02-10</endDate>
        </period>
    </context>
    <dei:EntityCentralIndexKey
      contextRef="i8acb3a35a3ec444fa789def99f3888e8_D20230210-20230210"
      id="id3VybDovL2RvY3MudjEvZG9jOmQyMDU0ZWIyNjVmMzQ3ZmRiYjFlZTg4MDg3YjEzOTdjL3NlYzpkMjA1NGViMjY1ZjM0N2ZkYmIxZWU4ODA4N2IxMzk3Y180L2ZyYWc6Mzk1MDRmZGI2ZDI0NGQxMzkwMDgwZjY2NWRmNTk5NTcvdGV4dHJlZ2lvbjozOTUwNGZkYjZkMjQ0ZDEzOTAwODBmNjY1ZGY1OTk1N185OQ_a4e834af-26fc-4d59-a5a3-75c4b0e9f483">0001165002</dei:EntityCentralIndexKey>
    <dei:AmendmentFlag
      contextRef="i8acb3a35a3ec444fa789def99f3888e8_D20230210-20230210"
      id="id3VybDovL2RvY3MudjEvZG9jOmQyMDU0ZWIyNjVmMzQ3ZmRiYjFlZTg4MDg3YjEzOTdjL3NlYzpkMjA1NGViMjY1ZjM0N2ZkYmIxZWU4ODA4N2IxMzk3Y180L2ZyYWc6Mzk1MDRmZGI2ZDI0NGQxMzkwMDgwZjY2NWRmNTk5NTcvdGV4dHJlZ2lvbjozOTUwNGZkYjZkMjQ0ZDEzOTAwODBmNjY1ZGY1OTk1N18xMDA_7d8f9340-8ac2-47bf-811d-f23a02b8b45b">false</dei:AmendmentFlag>
    <dei:DocumentType
      contextRef="i8acb3a35a3ec444fa789def99f3888e8_D20230210-20230210"
      id="id3VybDovL2RvY3MudjEvZG9jOmQyMDU0ZWIyNjVmMzQ3ZmRiYjFlZTg4MDg3YjEzOTdjL3NlYzpkMjA1NGViMjY1ZjM0N2ZkYmIxZWU4ODA4N2IxMzk3Y18xL2ZyYWc6ZGNlNjgwYmI2YmMxNGY1ZmE3OGE1YThlY2QyMTJjMjYvdGV4dHJlZ2lvbjpkY2U2ODBiYjZiYzE0ZjVmYTc4YTVhOGVjZDIxMmMyNl8zMzEx_93318d4e-6302-4a87-9c94-81f640a0f4b8">8-K</dei:DocumentType>
    <dei:DocumentPeriodEndDate
      contextRef="i8acb3a35a3ec444fa789def99f3888e8_D20230210-20230210"
      id="id3VybDovL2RvY3MudjEvZG9jOmQyMDU0ZWIyNjVmMzQ3ZmRiYjFlZTg4MDg3YjEzOTdjL3NlYzpkMjA1NGViMjY1ZjM0N2ZkYmIxZWU4ODA4N2IxMzk3Y18xL2ZyYWc6ZGNlNjgwYmI2YmMxNGY1ZmE3OGE1YThlY2QyMTJjMjYvdGV4dHJlZ2lvbjpkY2U2ODBiYjZiYzE0ZjVmYTc4YTVhOGVjZDIxMmMyNl8xMDk5NTExNjM2NjY4_1ab02ec0-f46e-4973-a4d8-410bf9aacc7c">2023-02-10</dei:DocumentPeriodEndDate>
    <dei:EntityRegistrantName
      contextRef="i8acb3a35a3ec444fa789def99f3888e8_D20230210-20230210"
      id="id3VybDovL2RvY3MudjEvZG9jOmQyMDU0ZWIyNjVmMzQ3ZmRiYjFlZTg4MDg3YjEzOTdjL3NlYzpkMjA1NGViMjY1ZjM0N2ZkYmIxZWU4ODA4N2IxMzk3Y18xL2ZyYWc6ZGNlNjgwYmI2YmMxNGY1ZmE3OGE1YThlY2QyMTJjMjYvdGV4dHJlZ2lvbjpkY2U2ODBiYjZiYzE0ZjVmYTc4YTVhOGVjZDIxMmMyNl8zMzIx_e7fa2886-50fc-4190-b5b6-a69211ca2519">WESTWOOD HOLDINGS GROUP, INC.</dei:EntityRegistrantName>
    <dei:EntityIncorporationStateCountryCode
      contextRef="i8acb3a35a3ec444fa789def99f3888e8_D20230210-20230210"
      id="id3VybDovL2RvY3MudjEvZG9jOmQyMDU0ZWIyNjVmMzQ3ZmRiYjFlZTg4MDg3YjEzOTdjL3NlYzpkMjA1NGViMjY1ZjM0N2ZkYmIxZWU4ODA4N2IxMzk3Y18xL2ZyYWc6ZGNlNjgwYmI2YmMxNGY1ZmE3OGE1YThlY2QyMTJjMjYvdGFibGU6M2M4Yzk3M2Y1MWM5NGZkZGExMWVmMmU3YjE1ODY4YzAvdGFibGVyYW5nZTozYzhjOTczZjUxYzk0ZmRkYTExZWYyZTdiMTU4NjhjMF8wLTAtMS0xLTc0NDM0_9c98b121-ac9d-4f90-ae82-fb472dea8aaa">DE</dei:EntityIncorporationStateCountryCode>
    <dei:EntityFileNumber
      contextRef="i8acb3a35a3ec444fa789def99f3888e8_D20230210-20230210"
      id="id3VybDovL2RvY3MudjEvZG9jOmQyMDU0ZWIyNjVmMzQ3ZmRiYjFlZTg4MDg3YjEzOTdjL3NlYzpkMjA1NGViMjY1ZjM0N2ZkYmIxZWU4ODA4N2IxMzk3Y18xL2ZyYWc6ZGNlNjgwYmI2YmMxNGY1ZmE3OGE1YThlY2QyMTJjMjYvdGFibGU6M2M4Yzk3M2Y1MWM5NGZkZGExMWVmMmU3YjE1ODY4YzAvdGFibGVyYW5nZTozYzhjOTczZjUxYzk0ZmRkYTExZWYyZTdiMTU4NjhjMF8wLTItMS0xLTc0NDM0_812a833e-211b-4f8c-ada0-a30b0947034f">001-31234</dei:EntityFileNumber>
    <dei:EntityTaxIdentificationNumber
      contextRef="i8acb3a35a3ec444fa789def99f3888e8_D20230210-20230210"
      id="id3VybDovL2RvY3MudjEvZG9jOmQyMDU0ZWIyNjVmMzQ3ZmRiYjFlZTg4MDg3YjEzOTdjL3NlYzpkMjA1NGViMjY1ZjM0N2ZkYmIxZWU4ODA4N2IxMzk3Y18xL2ZyYWc6ZGNlNjgwYmI2YmMxNGY1ZmE3OGE1YThlY2QyMTJjMjYvdGFibGU6M2M4Yzk3M2Y1MWM5NGZkZGExMWVmMmU3YjE1ODY4YzAvdGFibGVyYW5nZTozYzhjOTczZjUxYzk0ZmRkYTExZWYyZTdiMTU4NjhjMF8wLTQtMS0xLTc0NDM0_b1ea35a1-039a-4797-91da-33c387540aca">75-2969997</dei:EntityTaxIdentificationNumber>
    <dei:EntityAddressAddressLine1
      contextRef="i8acb3a35a3ec444fa789def99f3888e8_D20230210-20230210"
      id="id3VybDovL2RvY3MudjEvZG9jOmQyMDU0ZWIyNjVmMzQ3ZmRiYjFlZTg4MDg3YjEzOTdjL3NlYzpkMjA1NGViMjY1ZjM0N2ZkYmIxZWU4ODA4N2IxMzk3Y18xL2ZyYWc6ZGNlNjgwYmI2YmMxNGY1ZmE3OGE1YThlY2QyMTJjMjYvdGV4dHJlZ2lvbjpkY2U2ODBiYjZiYzE0ZjVmYTc4YTVhOGVjZDIxMmMyNl8zMzE4_9a2ad8a2-d81a-4ea5-bb04-e35faca95fd2">200 Crescent Court, Suite 1200</dei:EntityAddressAddressLine1>
    <dei:EntityAddressCityOrTown
      contextRef="i8acb3a35a3ec444fa789def99f3888e8_D20230210-20230210"
      id="id3VybDovL2RvY3MudjEvZG9jOmQyMDU0ZWIyNjVmMzQ3ZmRiYjFlZTg4MDg3YjEzOTdjL3NlYzpkMjA1NGViMjY1ZjM0N2ZkYmIxZWU4ODA4N2IxMzk3Y18xL2ZyYWc6ZGNlNjgwYmI2YmMxNGY1ZmE3OGE1YThlY2QyMTJjMjYvdGV4dHJlZ2lvbjpkY2U2ODBiYjZiYzE0ZjVmYTc4YTVhOGVjZDIxMmMyNl8zMzEy_383cea0a-e452-4d2f-bae9-8cf4207990f9">Dallas</dei:EntityAddressCityOrTown>
    <dei:EntityAddressStateOrProvince
      contextRef="i8acb3a35a3ec444fa789def99f3888e8_D20230210-20230210"
      id="id3VybDovL2RvY3MudjEvZG9jOmQyMDU0ZWIyNjVmMzQ3ZmRiYjFlZTg4MDg3YjEzOTdjL3NlYzpkMjA1NGViMjY1ZjM0N2ZkYmIxZWU4ODA4N2IxMzk3Y18xL2ZyYWc6ZGNlNjgwYmI2YmMxNGY1ZmE3OGE1YThlY2QyMTJjMjYvdGV4dHJlZ2lvbjpkY2U2ODBiYjZiYzE0ZjVmYTc4YTVhOGVjZDIxMmMyNl8zMzA5_d5325b60-73f9-42c7-9000-887afbe66cab">TX</dei:EntityAddressStateOrProvince>
    <dei:EntityAddressPostalZipCode
      contextRef="i8acb3a35a3ec444fa789def99f3888e8_D20230210-20230210"
      id="id3VybDovL2RvY3MudjEvZG9jOmQyMDU0ZWIyNjVmMzQ3ZmRiYjFlZTg4MDg3YjEzOTdjL3NlYzpkMjA1NGViMjY1ZjM0N2ZkYmIxZWU4ODA4N2IxMzk3Y18xL2ZyYWc6ZGNlNjgwYmI2YmMxNGY1ZmE3OGE1YThlY2QyMTJjMjYvdGV4dHJlZ2lvbjpkY2U2ODBiYjZiYzE0ZjVmYTc4YTVhOGVjZDIxMmMyNl8zMzEz_ba7725b9-1a40-4c21-a4a5-65e14213e8be">75201</dei:EntityAddressPostalZipCode>
    <dei:CityAreaCode
      contextRef="i8acb3a35a3ec444fa789def99f3888e8_D20230210-20230210"
      id="id3VybDovL2RvY3MudjEvZG9jOmQyMDU0ZWIyNjVmMzQ3ZmRiYjFlZTg4MDg3YjEzOTdjL3NlYzpkMjA1NGViMjY1ZjM0N2ZkYmIxZWU4ODA4N2IxMzk3Y18xL2ZyYWc6ZGNlNjgwYmI2YmMxNGY1ZmE3OGE1YThlY2QyMTJjMjYvdGV4dHJlZ2lvbjpkY2U2ODBiYjZiYzE0ZjVmYTc4YTVhOGVjZDIxMmMyNl8zMzE0_8803b8c2-bd79-46c2-8cff-69ed884e9060">(214)</dei:CityAreaCode>
    <dei:LocalPhoneNumber
      contextRef="i8acb3a35a3ec444fa789def99f3888e8_D20230210-20230210"
      id="id3VybDovL2RvY3MudjEvZG9jOmQyMDU0ZWIyNjVmMzQ3ZmRiYjFlZTg4MDg3YjEzOTdjL3NlYzpkMjA1NGViMjY1ZjM0N2ZkYmIxZWU4ODA4N2IxMzk3Y18xL2ZyYWc6ZGNlNjgwYmI2YmMxNGY1ZmE3OGE1YThlY2QyMTJjMjYvdGV4dHJlZ2lvbjpkY2U2ODBiYjZiYzE0ZjVmYTc4YTVhOGVjZDIxMmMyNl8zMzEw_8f9662b7-ca21-4622-9725-12e0afcffa77">756-6900</dei:LocalPhoneNumber>
    <dei:WrittenCommunications
      contextRef="i8acb3a35a3ec444fa789def99f3888e8_D20230210-20230210"
      id="id3VybDovL2RvY3MudjEvZG9jOmQyMDU0ZWIyNjVmMzQ3ZmRiYjFlZTg4MDg3YjEzOTdjL3NlYzpkMjA1NGViMjY1ZjM0N2ZkYmIxZWU4ODA4N2IxMzk3Y18xL2ZyYWc6ZGNlNjgwYmI2YmMxNGY1ZmE3OGE1YThlY2QyMTJjMjYvdGV4dHJlZ2lvbjpkY2U2ODBiYjZiYzE0ZjVmYTc4YTVhOGVjZDIxMmMyNl8zMzE5_d09e68c9-1d5a-4493-ab2f-1f99df98dce0">false</dei:WrittenCommunications>
    <dei:SolicitingMaterial
      contextRef="i8acb3a35a3ec444fa789def99f3888e8_D20230210-20230210"
      id="id3VybDovL2RvY3MudjEvZG9jOmQyMDU0ZWIyNjVmMzQ3ZmRiYjFlZTg4MDg3YjEzOTdjL3NlYzpkMjA1NGViMjY1ZjM0N2ZkYmIxZWU4ODA4N2IxMzk3Y18xL2ZyYWc6ZGNlNjgwYmI2YmMxNGY1ZmE3OGE1YThlY2QyMTJjMjYvdGV4dHJlZ2lvbjpkY2U2ODBiYjZiYzE0ZjVmYTc4YTVhOGVjZDIxMmMyNl8zMzE1_aaa05283-88cf-494d-9d53-3cd526bfe4cc">false</dei:SolicitingMaterial>
    <dei:PreCommencementTenderOffer
      contextRef="i8acb3a35a3ec444fa789def99f3888e8_D20230210-20230210"
      id="id3VybDovL2RvY3MudjEvZG9jOmQyMDU0ZWIyNjVmMzQ3ZmRiYjFlZTg4MDg3YjEzOTdjL3NlYzpkMjA1NGViMjY1ZjM0N2ZkYmIxZWU4ODA4N2IxMzk3Y18xL2ZyYWc6ZGNlNjgwYmI2YmMxNGY1ZmE3OGE1YThlY2QyMTJjMjYvdGV4dHJlZ2lvbjpkY2U2ODBiYjZiYzE0ZjVmYTc4YTVhOGVjZDIxMmMyNl8zMzIy_c354a2fc-c046-4792-9c3a-60ae538fa3bd">false</dei:PreCommencementTenderOffer>
    <dei:PreCommencementIssuerTenderOffer
      contextRef="i8acb3a35a3ec444fa789def99f3888e8_D20230210-20230210"
      id="id3VybDovL2RvY3MudjEvZG9jOmQyMDU0ZWIyNjVmMzQ3ZmRiYjFlZTg4MDg3YjEzOTdjL3NlYzpkMjA1NGViMjY1ZjM0N2ZkYmIxZWU4ODA4N2IxMzk3Y18xL2ZyYWc6ZGNlNjgwYmI2YmMxNGY1ZmE3OGE1YThlY2QyMTJjMjYvdGV4dHJlZ2lvbjpkY2U2ODBiYjZiYzE0ZjVmYTc4YTVhOGVjZDIxMmMyNl8zMzIz_182cf175-7502-4535-9dcc-f316a12c9ef2">false</dei:PreCommencementIssuerTenderOffer>
    <dei:Security12bTitle
      contextRef="i8acb3a35a3ec444fa789def99f3888e8_D20230210-20230210"
      id="id3VybDovL2RvY3MudjEvZG9jOmQyMDU0ZWIyNjVmMzQ3ZmRiYjFlZTg4MDg3YjEzOTdjL3NlYzpkMjA1NGViMjY1ZjM0N2ZkYmIxZWU4ODA4N2IxMzk3Y18xL2ZyYWc6ZGNlNjgwYmI2YmMxNGY1ZmE3OGE1YThlY2QyMTJjMjYvdGFibGU6NjA4NTkyMzg2MjlmNDUyYjhkZGQwYmQzYWNkMTgxNWIvdGFibGVyYW5nZTo2MDg1OTIzODYyOWY0NTJiOGRkZDBiZDNhY2QxODE1Yl8xLTAtMS0xLTc0NDM0_0931db5d-dd30-4fb1-ac06-9b02668fb697">Common stock, par value $0.01 per share</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="i8acb3a35a3ec444fa789def99f3888e8_D20230210-20230210"
      id="id3VybDovL2RvY3MudjEvZG9jOmQyMDU0ZWIyNjVmMzQ3ZmRiYjFlZTg4MDg3YjEzOTdjL3NlYzpkMjA1NGViMjY1ZjM0N2ZkYmIxZWU4ODA4N2IxMzk3Y18xL2ZyYWc6ZGNlNjgwYmI2YmMxNGY1ZmE3OGE1YThlY2QyMTJjMjYvdGFibGU6NjA4NTkyMzg2MjlmNDUyYjhkZGQwYmQzYWNkMTgxNWIvdGFibGVyYW5nZTo2MDg1OTIzODYyOWY0NTJiOGRkZDBiZDNhY2QxODE1Yl8xLTEtMS0xLTc0NDM0_217f6860-7c51-459b-9ed9-a685b4c80f28">WHG</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="i8acb3a35a3ec444fa789def99f3888e8_D20230210-20230210"
      id="id3VybDovL2RvY3MudjEvZG9jOmQyMDU0ZWIyNjVmMzQ3ZmRiYjFlZTg4MDg3YjEzOTdjL3NlYzpkMjA1NGViMjY1ZjM0N2ZkYmIxZWU4ODA4N2IxMzk3Y18xL2ZyYWc6ZGNlNjgwYmI2YmMxNGY1ZmE3OGE1YThlY2QyMTJjMjYvdGFibGU6NjA4NTkyMzg2MjlmNDUyYjhkZGQwYmQzYWNkMTgxNWIvdGFibGVyYW5nZTo2MDg1OTIzODYyOWY0NTJiOGRkZDBiZDNhY2QxODE1Yl8xLTItMS0xLTc0NDM0_681fc41e-d4d6-4a92-92a2-867c376ffb90">NYSE</dei:SecurityExchangeName>
    <dei:EntityEmergingGrowthCompany
      contextRef="i8acb3a35a3ec444fa789def99f3888e8_D20230210-20230210"
      id="id3VybDovL2RvY3MudjEvZG9jOmQyMDU0ZWIyNjVmMzQ3ZmRiYjFlZTg4MDg3YjEzOTdjL3NlYzpkMjA1NGViMjY1ZjM0N2ZkYmIxZWU4ODA4N2IxMzk3Y18xL2ZyYWc6ZGNlNjgwYmI2YmMxNGY1ZmE3OGE1YThlY2QyMTJjMjYvdGV4dHJlZ2lvbjpkY2U2ODBiYjZiYzE0ZjVmYTc4YTVhOGVjZDIxMmMyNl8zMzE2_34d5a1e3-2502-4d41-a7bb-03adc7e74729">false</dei:EntityEmergingGrowthCompany>
</xbrl>
