Business Realignment Activities - Expenses and Losses Associated with Business Realignment Activity (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Compensation and benefits	$ 56,635
Other	11,175	[1]
Total	67,810
Financial Advisory Segment [Member]
Compensation and benefits	39,476
Other	4,371	[1]
Total	43,847
Asset Management Segment [Member]
Compensation and benefits	14,480
Other	1,750	[1]
Total	16,230
Corporate Segment [Member]
Compensation and benefits	2,679
Other	5,054	[1]
Total	$ 7,733

[1] Financial Advisory includes losses of $3,727 associated with the closing of certain offices as part of business realignment.