Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 16,177	$ 53,981
Foreign currency translation adjustment, net of tax	540	1,679
Other comprehensive income (loss)	540	1,679
Comprehensive income (loss)	16,717	55,660
Less: Comprehensive income attributable to noncontrolling interests	2,726	21,266
Comprehensive income (loss) attributable to Moelis & Company	$ 13,991	$ 34,394