Segment Information - Reported Revenue and Profit Before Income Taxes (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenue
Total revenue		$ (218,945)	$ (211,804)	$ (212,074)	$ (214,956)	$ (225,189)	$ (207,478)	$ (227,959)	$ (237,175)	$ (857,779)	$ (897,801)	$ (981,135)
Income (loss) before income taxes
Income (loss) before income taxes from continuing operations		$ (7,496)	$ (1,810)	$ (5,246)	$ (7,340)	$ (4,568)	$ (2,573)	$ (1,101)	$ 5,814	(21,892)	(2,428)	17,190
Private Client Division
Revenue
Total revenue	[1]									(504,192)	(521,526)	(582,364)
Income (loss) before income taxes
Income (loss) before income taxes from continuing operations	[1]									$ 66,072	$ 59,016	$ 60,116
Asset management fees										77.50%	77.50%	77.50%
Asset Management
Revenue
Total revenue	[1]									$ (92,852)	$ (97,121)	$ (99,964)
Income (loss) before income taxes
Income (loss) before income taxes from continuing operations	[1]									$ 31,412	$ 33,133	$ 33,707
Asset management fees										22.50%	22.50%	22.50%
Capital markets
Revenue
Total revenue										$ (254,933)	$ (279,589)	$ (298,597)
Income (loss) before income taxes
Income (loss) before income taxes from continuing operations										(17,713)	5,167	17,819
Corporate/Other
Revenue
Total revenue										(5,802)	(435)	(210)
Income (loss) before income taxes
Income (loss) before income taxes from continuing operations										$ (101,663)	$ (99,744)	$ (94,452)

[1] Asset management fees are allocated 22.5% to the Asset Management and 77.5% to the Private Client segments.