Equity Method Investments	9 Months Ended
Sep. 30, 2018
Equity Method Investments And Joint Ventures [Abstract]
Equity Method Investments	4. EQUITY METHOD INVESTMENTS Moelis Australia On April 1, 2010, the Company entered into a 50-50 joint venture in Moelis Australia Holdings PTY Limited, investing a combination of cash and certain net assets in exchange for its interests. The remaining 50% was owned by an Australian trust established by and for the benefit of Moelis Australia senior executives. On April 10, 2017, Moelis Australia Holdings PTY Limited consummated their initial public offering and became listed on the Australian Securities Exchange as Moelis Australia Limited (ASX: MOE). As a result of the offering, the Company’s ownership interest in Moelis Australia was diluted to less than 50% and the Company recognized a gain of approximately $15,170 during the second quarter of 2017, recorded in other income and expenses on the condensed consolidated statement of operations. Contemporaneous with the offering, Moelis Australia agreed to terminate an asset management related revenue sharing agreement resulting in a payment to a third party, of which the Company recognized a charge of approximately $2,400 in income (loss) from equity method investments during the second quarter of 2017. In connection with Moelis Australia’s initial public offering, the Company and Moelis Australia entered into a Strategic Alliance Agreement for Moelis Australia to continue to conduct its investment banking advisory business in Australia and New Zealand as an integrated part of the global advisory business of the Company consistent with the manner in which Moelis Australia and the Company have partnered together since 2010. Also, in connection with the offering and new shareholders agreement, the Company and Moelis Australia terminated a put option enabling the key senior Australian executive to sell his shares held in Moelis Australia back to the Company, and a call option held by the Company to purchase additional shares in Moelis Australia. On March 20, 2017, Moelis Australia declared a dividend, of which the Company received $11,672 on April 18, 2017. The Company accounted for the dividend as a return on investment and reduced the carrying value of the investment in Moelis Australia by $11,672 on April 18, 2017. On September 13, 2017 and October 30, 2017, Moelis Australia completed offerings of 11,940,000 and 10,060,000 shares of common stock, respectively, to raise additional capital. The issuance of shares further reduced Moelis & Company’s ownership interest in Moelis Australia. These shares were issued at a fair value greater than the carrying value of the ownership interest disposed, resulting in gains of approximately $14,429 and $9,680, during the third and fourth quarter of 2017, respectively, recorded in other income on the condensed consolidated statement of operations. Moelis Australia issued additional shares during 2017 related to acquisitions, which further reduced Moelis & Company’s ownership interest in Moelis Australia. The shares were issued at a fair value greater than the carrying value of the ownership interest disposed, resulting in gains of approximately $2,280 and $92, during the second and third quarter of 2017, respectively, recorded in other income and expenses on the condensed consolidated statement of operations. On February 20, 2018, Moelis Australia declared a dividend, of which the Company received $2,737 on March 7, 2018. The Company accounted for the dividend as a return on investment and reduced the carrying value of the investment in Moelis Australia by $2,737. For the three months ended September 30, 2018 and 2017, income of $527 and $2,806 was recorded on this investment, respectively, and for the nine months ended September 30, 2018 and 2017, income of $3,641 and $4,592 was recorded on this investment, respectively.

4. EQUITY METHOD INVESTMENTS

Moelis Australia

On April 1, 2010, the Company entered into a 50-50 joint venture in Moelis Australia Holdings PTY Limited, investing a combination of cash and certain net assets in exchange for its interests. The remaining 50% was owned by an Australian trust established by and for the benefit of Moelis Australia senior executives.

On April 10, 2017, Moelis Australia Holdings PTY Limited consummated their initial public offering and became listed on the Australian Securities Exchange as Moelis Australia Limited (ASX: MOE). As a result of the offering, the Company’s ownership interest in Moelis Australia was diluted to less than 50% and the Company recognized a gain of approximately $15,170 during the second quarter of 2017, recorded in other income and expenses on the condensed consolidated statement of operations. Contemporaneous with the offering, Moelis Australia agreed to terminate an asset management related revenue sharing agreement resulting in a payment to a third party, of which the Company recognized a charge of approximately $2,400 in income (loss) from equity method investments during the second quarter of 2017. In connection with Moelis Australia’s initial public offering, the Company and Moelis Australia entered into a Strategic Alliance Agreement for Moelis Australia to continue to conduct its investment banking advisory business in Australia and New Zealand as an integrated part of the global advisory business of the Company consistent with the manner in which Moelis Australia and the Company have partnered together since 2010. Also, in connection with the offering and new shareholders agreement, the Company and Moelis Australia terminated a put option enabling the key senior Australian executive to sell his shares held in Moelis Australia back to the Company, and a call option held by the Company to purchase additional shares in Moelis Australia. On March 20, 2017, Moelis Australia declared a dividend, of which the Company received $11,672 on April 18, 2017. The Company accounted for the dividend as a return on investment and reduced the carrying value of the investment in Moelis Australia by $11,672 on April 18, 2017.

On September 13, 2017 and October 30, 2017, Moelis Australia completed offerings of 11,940,000 and 10,060,000 shares of common stock, respectively, to raise additional capital. The issuance of shares further reduced Moelis & Company’s ownership interest in Moelis Australia. These shares were issued at a fair value greater than the carrying value of the ownership interest disposed, resulting in gains of approximately $14,429 and $9,680, during the third and fourth quarter of 2017, respectively, recorded in other income on the condensed consolidated statement of operations.

Moelis Australia issued additional shares during 2017 related to acquisitions, which further reduced Moelis & Company’s ownership interest in Moelis Australia. The shares were issued at a fair value greater than the carrying value of the ownership interest disposed, resulting in gains of approximately $2,280 and $92, during the second and third quarter of 2017, respectively, recorded in other income and expenses on the condensed consolidated statement of operations.

On February 20, 2018, Moelis Australia declared a dividend, of which the Company received $2,737 on March 7, 2018. The Company accounted for the dividend as a return on investment and reduced the carrying value of the investment in Moelis Australia by $2,737.

For the three months ended September 30, 2018 and 2017, income of $527 and $2,806 was recorded on this investment, respectively, and for the nine months ended September 30, 2018 and 2017, income of $3,641 and $4,592 was recorded on this investment, respectively.