Equity Method Investment - Summary of Financial Information Related to Moelis Australia (Details) - Moelis Australia Holdings - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Equity Method Investments
Total revenues	$ 106,894	$ 91,222	$ 83,602
Total expenses	(90,558)	(69,688)	(62,187)
Net Income (loss)	16,336	21,534	$ 21,415
Total assets	360,035	261,513
Total liabilities	(200,925)	(91,799)
Net equity	$ 159,110	$ 169,714