Variable Interest Entities (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
Variable Interest Entities
Assets Under Management	$ 19,770,000,000
Trading	73,099,000	64,554,000
Westwood Funds
Variable Interest Entities
Assets Under Management	3,407,000,000
Trading	3,400,000
Risk of Loss	3,400,000
Common Trust Funds
Variable Interest Entities
Assets Under Management	2,666,000,000
Trading	2,200,000
Risk of Loss	2,200,000
Collective Investment Trusts
Variable Interest Entities
Assets Under Management	306,000,000
UCITS Fund
Variable Interest Entities
Assets Under Management	829,000,000
VIE totals
Variable Interest Entities
Assets Under Management	7,452,000,000
Trust Services
Variable Interest Entities
Assets Under Management	1,129,000,000
Advisory Services
Variable Interest Entities
Assets Under Management	11,189,000,000
LLCs
Variable Interest Entities
Assets Under Management	$ 244,000,000