| Cover | Feb. 09, 2022 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Feb. 9, 2022 |
| Entity Registrant Name | WESTWOOD HOLDINGS GROUP, INC. |
| Entity Tax Identification Number | 75-2969997 |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-31234 |
| Entity Address, Address Line One | 200 Crescent Court, Suite 1200 |
| Entity Address, City or Town | Dallas |
| Entity Address, State or Province | TX |
| Entity Address, Postal Zip Code | 75201 |
| City Area Code | (214) |
| Local Phone Number | 756-6900 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Issuer Tender Offer | false |
| Pre-commencement Tender Offer | false |
| Title of 12(b) Security | Common stock, par value $0.01 per share |
| Trading Symbol | WHG |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001165002 |
| Amendment Flag | false |
