Business Realignment Activities - Expenses and Losses Associated with Business Realignment Activity (Parenthetical) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Other expenses and losses associated with business realignment	$ 11,175	[1]
Financial Advisory Segment [Member]
Other expenses and losses associated with business realignment	4,371	[1]
Financial Advisory Segment [Member] | Certain Offices [Member]
Other expenses and losses associated with business realignment	$ 3,727

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