Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2019	Jun. 30, 2019	Feb. 15, 2019
Document And Entity Information [Abstract]
Entity Registrant Name	WESTWOOD HOLDINGS GROUP INC
Entity Central Index Key	0001165002
Document Type	10-K
Document Period End Date	Dec. 31, 2019
Amendment Flag	false
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Entity Public Float		$ 427,426,109
Entity Common Stock, Shares Outstanding			8,912,392
Entity Shell Company	false
Entity Emerging Growth Company	false
Entity Small Business	false
Document Transition Report	false