Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 41,793	$ 54,698	$ 62,875	$ 108,542
Foreign currency translation adjustment, net of tax	(499)	(322)	(2,224)	161
Other comprehensive income (loss)	(499)	(322)	(2,224)	161
Comprehensive income (loss)	41,294	54,376	60,651	108,703
Less: Comprehensive income (loss) attributable to noncontrolling interests	8,752	14,016	10,093	24,938
Comprehensive income (loss) attributable to Moelis & Company	$ 32,542	$ 40,360	$ 50,558	$ 83,765