Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenues	$ 1,540,611	$ 943,276	$ 746,534
Expenses
Compensation and benefits	913,909	560,803	488,439
Occupancy	26,533	30,033	20,209
Professional fees	21,826	18,378	19,229
Communication, technology and information services	35,373	32,181	31,590
Travel and related expenses	15,399	12,845	41,496
Depreciation and amortization	7,242	4,708	4,965
Other expenses	24,412	18,619	26,063
Total expenses	1,044,694	677,567	631,991
Operating income (loss)	495,917	265,709	114,543
Other income and (expenses)	40,396	4,404	32,962
Income (loss) before income taxes	536,313	270,113	147,505
Provision (benefit) for income taxes	113,335	51,675	11,813
Net income (loss)	422,978	218,438	135,692
Net income (loss) attributable to noncontrolling interests	57,765	39,607	30,597
Net income (loss) attributable to Moelis & Company	365,213	178,831	105,095
Class A Common Stock
Expenses
Net income (loss) attributable to Moelis & Company	$ 365,213	$ 178,831	$ 105,095
Weighted-average shares of Class A common stock outstanding
Basic (in shares)	63,125,497	56,566,645	50,373,874
Diluted (in shares)	68,435,579	60,723,365	55,513,149
Net income (loss) per share attributable to holders of shares of Class A common stock
Basic (in dollars per share)	$ 5.79	$ 3.16	$ 2.09
Diluted (in dollars per share)	$ 5.34	$ 2.95	$ 1.89