Cover	12 Months Ended
	Dec. 31, 2019
Cover page.
Document Type	10-K
Entity Incorporation, State or Country Code	DE
City Area Code	(214)
Local Phone Number	756-6900
Entity File Number	1-31234
Entity Address, City or Town	Dallas,
Entity Address, Postal Zip Code	75201
Entity Tax Identification Number	75-2969997
Entity Address, Address Line One	200 Crescent Court, Suite 1200
Trading Symbol	WHG
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Emerging Growth Company	false
Entity Shell Company	false
Title of 12(b) Security	Common Stock, par value $0.01 per share
Entity Address, State or Province	TX
Document Annual Report	true