Asset Sales and Divestitures (Details) $ in Thousands	1 Months Ended		3 Months Ended		12 Months Ended
	Dec. 31, 2018 USD ($)	Apr. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($) office
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain/ (loss) on sale of affiliates or offices					$ 18,142	$ (1,264)	$ 2,862
Gain (loss) on sale of properties, applicable income taxes	$ 3,500	$ 12,700
Impairment of goodwill				$ 24,900	0	24,901	9,528
Bingham, Osborn & Scarborough, LLC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale					$ 21,100
Revenue sharing term					8 years
Net present value of asset sold					$ 13,900
Gain/ (loss) on sale of affiliates or offices			$ 18,100
Gain (loss) on sale of properties, applicable income taxes			$ 3,500
Anchor
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale						31,800
Net present value of asset sold						15,400
Gain/ (loss) on sale of affiliates or offices						(1,300)
Gain (loss) on sale of properties, applicable income taxes						12,700
Impairment of goodwill						24,900
Assets held for sale				58,800		58,800
Liabilities held for sale				$ 3,200		$ 3,200
Offices In Southern California
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain/ (loss) on sale of affiliates or offices							$ 2,900
Number of offices sold | office							2
Liabilities deposits included in sale							$ 104,000
Westfield Capital Management Company
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Remaining ownership percentage				12.50%		12.50%
Remaining annual maximum revenue				$ 11,600		$ 11,600