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RELATED-PARTY TRANSACTIONS (Details) $ in Thousands			3 Months Ended		6 Months Ended		12 Months Ended
	Apr. 10, 2017 USD ($)	Aug. 30, 2014 item	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)	Jun. 30, 2014 USD ($)
Related-party transactions
Principal repayments					$ 403
Investment into the entity controlled by a related party			$ 28,425		28,425		$ 20,873
Income (loss) from equity method investments			(1,330)	$ 266	1,774	$ 2,335
Manager | Aircraft lease entered into during August 2014
Related-party transactions
Expenses			468	312	936	624
Number of other lessees | item		2
Employees | Unsecured promissory notes
Related-party transactions
Unsecured promissory notes from employees			928		$ 928		$ 922
Interest rates (as a percent)					4.00%		4.00%
Principal repayments					$ 403	0
Interest income recognized					13	8
Moelis Australia Holdings
Related-party transactions
Due to related party			247		247		$ 38
Income (loss) from equity method investments	$ (2,400)		(1,326)	232	1,786	605
Moelis Asset Management LP
Related-party transactions
Fee for services			291	349	604	711
Due from related party			0		0		$ 0
Investment into the entity controlled by a related party								$ 265
Income (loss) from equity method investments				34		1,730
Cash distributions						813
Revenue from related parties			$ 127	$ 6,616	$ 1,146	$ 7,016

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