Grosvenor Capital Management (GCMG) 10-Q 14 May 21 2021 Q1 Quarterly report Financial data

Cover

Cover - shares	3 Months Ended
	Mar. 31, 2021	May 12, 2021
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2021
Document Transition Report	false
Entity File Number	001-39716
Entity Registrant Name	GCM Grosvenor Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	85-2226287
Entity Address, Address Line One	900 North Michigan Avenue, Suite 1100
Entity Address, City or Town	Chicago
Entity Address, State or Province	IL
Entity Address, Postal Zip Code	60611
City Area Code	312
Local Phone Number	506-6500
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Shell Company	false
Amendment Flag	false
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1
Entity Central Index Key	0001819796
Current Fiscal Year End Date	--12-31
Common Stock
Document Information [Line Items]
Title of 12(b) Security	Class A common stock, $0.0001 par value per share
Trading Symbol	GCMG
Security Exchange Name	NASDAQ
Warrant
Document Information [Line Items]
Title of 12(b) Security	Warrants to purchase shares of Class A common stock
Trading Symbol	GCMGW
Security Exchange Name	NASDAQ
Common Class A
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		42,628,996
Common Class C
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		144,235,246

Consolidated Statements of Fina

Consolidated Statements of Financial Condition - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Assets
Cash and cash equivalents	$ 156,273	$ 198,146
Management fees receivable	15,955	14,524
Incentive fees receivable	25,935	69,424
Due from related parties	8,513	11,326
Investments	180,708	166,273
Property, Plant and Equipment, Net	6,110	7,870
Intangible assets, net	8,004	8,588
Goodwill	28,959	28,959
Deferred tax assets, net	73,355	74,153
Other assets	31,031	53,015
Total assets	534,843	632,278
Liabilities and Equity (Deficit)
Accrued compensation and benefits	20,794	74,681
Employee related obligations	26,898	25,274
Debt	284,982	335,155
Payable to related parties pursuant to the tax receivable agreement	60,598	60,518
Warrant liabilities	26,049	42,793
Accrued expenses and other liabilities	35,266	60,926
Total liabilities	454,587	599,347
Commitments and contingencies (Note 15)
Redeemable noncontrolling interest	117,460	115,121
Preferred stock, $0.0001 par value, 100,000,000 shares authorized, none issued	0	0
Additional paid-in capital	13,920	2,705
Accumulated other comprehensive loss	(1,570)	(2,233)
Retained earnings	(33,833)	(29,832)
Total GCM Grosvenor Inc. deficit	(21,465)	(29,342)
Noncontrolling interests in subsidiaries	96,158	94,013
Noncontrolling interests in GCMH	(111,897)	(146,861)
Total deficit	(37,204)	(82,190)
Total liabilities and equity (deficit)	534,843	632,278
Common Class A
Liabilities and Equity (Deficit)
Common stock	4	4
Common Class B
Liabilities and Equity (Deficit)
Common stock	0	0
Common Class C
Liabilities and Equity (Deficit)
Common stock	$ 14	$ 14

Consolidated Statements of Fi_2

Consolidated Statements of Financial Condition (Parenthetical) - $ / shares	Mar. 31, 2021	Dec. 31, 2020
Preferred stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, authorized (in shares)	100,000,000	100,000,000
Preferred stock issued (in shares)	0	0
Common Class A
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, authorized (in shares)	700,000,000	700,000,000
Common stock, issued (in shares)	42,628,996	40,835,093
Common stock, outstanding (in shares)	42,628,996	40,835,093
Common Class B
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, authorized (in shares)	500,000,000	500,000,000
Common stock, issued (in shares)	0	0
Common stock, outstanding (in shares)	0	0
Common Class C
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, authorized (in shares)	300,000,000	300,000,000
Common stock, issued (in shares)	144,235,246	144,235,246
Common stock, outstanding (in shares)	144,235,246	144,235,246

Consolidated Statements of Inco

Consolidated Statements of Income and Comprehensive Income - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Revenues
Operating revenue		$ 103,219	$ 82,617
Expenses
Employee compensation and benefits		83,353	55,477
General, administrative and other		24,532	24,596
Total operating expenses		107,885	80,073
Operating income (loss)		(4,666)	2,544
Investment income		13,048	3,373
Interest expense		(4,491)	(5,867)
Other income (expense)		1,317	(9,733)
Change in fair value of warrant liabilities		14,057	0
Net other income (expense)		23,931	(12,227)
Income (loss) before income taxes		19,265	(9,683)
Provision (benefit) for income taxes		(663)	643
Net income (loss)		19,928	(10,326)
Less: Net income attributable to redeemable noncontrolling interest		8,089	2,093
Less: Net income attributable to noncontrolling interests in subsidiaries		8,589	2,536
Less: Net income (loss) attributable to noncontrolling interests in GCMH		703	(14,955)
Net income attributable to GCM Grosvenor Inc.		$ 2,547	$ 0
Earnings (loss) per share of Class A common stock:
Basic (in dollars per share)	[1]	$ 0.06	$ 0
Diluted (in dollars per share)	[1]	$ (0.05)	$ 0
Weighted average shares of Class A common stock outstanding:
Basic (in shares)	[1]	42,084,366	0
Diluted (in shares)	[1]	188,872,053	0
Management fees
Revenues
Operating revenue		$ 82,625	$ 77,701
Incentive fees
Revenues
Operating revenue		18,214	3,233
Other operating income
Revenues
Operating revenue		$ 2,380	$ 1,683
[1]	There were no shares of Class A common stock outstanding prior to November 17, 2020, therefore no earnings (loss) per share information has been presented for any period prior to that date.

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 19,928	$ (10,326)
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Unrealized gain (loss) on cash flow hedges	3,679	(7,277)
Foreign currency translation adjustment	(615)	(293)
Total other comprehensive income (loss)	3,064	(7,570)
Comprehensive income (loss) before noncontrolling interests	22,992	(17,896)
Less: Comprehensive income attributable to redeemable noncontrolling interest	8,089	2,093
Less: Comprehensive income attributable to noncontrolling interests in subsidiaries	8,589	2,536
Less: Comprehensive income (loss) attributable to noncontrolling interests in GCMH	3,075	(22,525)
Comprehensive income (loss) attributable to GCM Grosvenor Inc.	$ 3,239	$ 0

Consolidated Statements of Equi

Consolidated Statements of Equity (Deficit) - USD ($) $ in Thousands	Total	Other Noncontrolling Subsidiaries	GCM Holdings	Member’s Deficit-GCM, L.L.C.	Common StockCommon Class A	Common StockCommon Class C	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interest in Subsidiaries	Noncontrolling Interest in SubsidiariesOther Noncontrolling Subsidiaries	Noncontrolling Interest in GCMH	Noncontrolling Interest in GCMHGCM Holdings	Partners’ Deficit	Cumulative-effect adjustment from adoption	Cumulative-effect adjustment from adoptionAccumulated Other Comprehensive Income (Loss)	Cumulative-effect adjustment from adoptionPartners’ Deficit
Beginning balance at Dec. 31, 2019	$ (213,830)			$ (66)					$ (6,854)	$ 101,463				$ (308,373)	$ 0	$ 650	$ (650)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Capital contributions from noncontrolling interest in subsidiaries	1,237									1,237
Deemed contributions	7,920													7,920
Capital distributions	(15)			(15)
Capital distributions paid to noncontrolling interest	(5,814)									(5,814)
Equity transaction with Mosaic	60,931													60,931
Unrealized gain (loss) on cash flow hedges	(7,277)								(7,277)
Translation adjustment	(293)								(293)
Net income (loss)	(12,419)			13						2,536				(14,968)
Ending balance at Mar. 31, 2020	(169,560)			$ (68)					(13,774)	99,422				$ (255,140)
Increase (Decrease) in Temporary Equity [Roll Forward]
Capital contributions from redeemable noncontrolling interest	173,327
Equity transaction with Mosaic	(60,931)
Net income (loss)	2,093
Ending balance at Mar. 31, 2020	114,489
Beginning balance at Dec. 31, 2020	(82,190)				$ 4	$ 14	$ 2,705	$ (29,832)	(2,233)	94,013		$ (146,861)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Capital contributions from noncontrolling interest in subsidiaries	1,083									1,083
Capital distributions paid to noncontrolling interest		$ (7,527)	$ (11,687)								$ (7,527)		$ (11,687)
Issuance of Class A common stock due to exercised warrants	23,316						5,252					18,064
Deemed contributions	4,903											4,903
Unrealized gain (loss) on cash flow hedges	3,679								831			2,848
Translation adjustment	(615)								(139)			(476)
Restricted stock units	26,632						6,023					20,609
Dividends	(6,548)							(6,548)
Deferred tax and other tax adjustments	(89)						(60)		(29)
Net income (loss)	11,839							2,547		8,589		703
Ending balance at Mar. 31, 2021	(37,204)				$ 4	$ 14	$ 13,920	$ (33,833)	$ (1,570)	$ 96,158		$ (111,897)
Beginning balance at Dec. 31, 2020	115,121
Increase (Decrease) in Temporary Equity [Roll Forward]
Capital distributions paid to redeemable noncontrolling interest	(5,750)
Net income (loss)	8,089
Ending balance at Mar. 31, 2021	$ 117,460

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities
Net income (loss)	$ 19,928	$ (10,326)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities
Depreciation and amortization expense	1,056	2,572
Equity-based compensation	26,632	0
Deferred taxes	865	0
Other non-cash compensation	941	1,065
Non-cash partnership interest-based compensation	4,903	7,920
Amortization of debt issuance costs	261	855
Amortization of terminated swap	536	0
Loss on extinguishment of debt	675	1,032
Change in fair value of derivatives	212	8,634
Change in fair value of warrant liabilities	(14,057)	0
Amortization of deferred rent	(397)	(128)
Proceeds received from investments	3,894	2,596
Non-cash investment income	(13,048)	(3,373)
Other	28	30
Change in assets and liabilities
Management fees receivable	(1,429)	969
Incentive fees receivable	43,489	13,913
Due from related parties	2,813	820
Other assets	20,992	(15,264)
Accrued compensation and benefits	(54,393)	(42,188)
Employee related obligations	563	(2,971)
Accrued expenses and other liabilities	(28,673)	807
Net cash provided by (used in) operating activities	15,791	(33,037)
Cash flows from investing activities
Purchases of premises and equipment	(55)	(809)
Consideration received from assignment to partner	1,337	0
Contributions/subscriptions to investments	(8,207)	(6,425)
Withdrawals/redemption from investments	2,926	5,550
Net cash provided by (used in) investing activities	(3,999)	(1,684)
Cash flows from financing activities
Capital contributions received from noncontrolling interest	1,083	174,564
Capital distributions paid to partners and member	(11,687)	(15)
Capital distributions paid to the noncontrolling interest	(13,277)	(5,814)
Proceeds from credit facility	0	20,000
Principal payments on credit facility	0	(3,000)
Principal payments on senior loan	(50,259)	(91,195)
Debt issuance costs	(851)	0
Proceeds from exercise of warrants	24,465	0
Dividends paid	(2,478)	0
Net cash provided by (used in) financing activities	(53,004)	94,540
Effect of exchange rate changes on cash	(661)	(325)
Net increase (decrease) in cash and cash equivalents	(41,873)	59,494
Beginning of period	198,146	79,866
End of period	156,273	139,360
Supplemental disclosure of cash flow information
Cash paid during the period for interest	3,622	5,456
Cash paid during the period for income taxes	678	726
Supplemental disclosure of non-cash information from financing activities
Deemed contributions from GCMH Equityholders	4,903	7,920
Establishment of deferred tax assets, net related to tax receivable agreement and the Transaction	(60)	$ 0
Dividends declared but not paid	$ 4,070

Organization

Organization	3 Months Ended
	Mar. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization	Organization GCM Grosvenor Inc. (“GCMG”) and its subsidiaries including Grosvenor Capital Management Holdings, LLLP (the “Partnership” or “GCMH” and collectively, the “Company”), provide comprehensive investment solutions to primarily institutional clients who seek allocations to alternative investments such as hedge fund strategies, private equity, real estate, infrastructure and strategic investments. The Company collaborates with its clients to construct investment portfolios across multiple investment strategies in the private and public markets, customized to meet their specific objectives. The Company also offers specialized commingled funds which span the alternatives investing universe that are developed to meet broad market demands for strategies and risk-return objectives. The Company, through its subsidiaries acts as the investment adviser, general partner or managing member to customized funds and commingled funds (collectively, the “GCM Funds”). GCMG was incorporated on July 27, 2020 under the laws of the State of Delaware for the purpose of consummating the Transaction as described in Note 3 and merging with CF Finance Acquisition Corp. (“CFAC”), a blank check company incorporated on July 9, 2014 under the laws of the state of Delaware. GCMG owns all of the equity interests of GCM Grosvenor Holdings, LLC (“IntermediateCo”), formerly known as CF Finance Intermediate Acquisition, LLC until November 18, 2020, which is the general partner of GCMH subsequent to the Transaction. GCMG’s ownership (through IntermediateCo) of GCMH as of March 31, 2021 and December 31, 2020 was approximately 22.8% and 22.1%, respectively. GCMH is a holding company operated pursuant to the Fifth Amended and Restated Limited Liability Limited Partnership Agreement (the “Partnership Agreement”) dated November 17, 2020, among the limited partners including, Grosvenor Holdings, L.L.C. (“Holdings”), Grosvenor Holdings II, L.L.C (“Holdings II”) and GCM Grosvenor Management, LLC (“Management LLC”) (collectively, “GCMH Equityholders”).

Summary of Significant Accounti

Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2021
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Basis of Presentation The unaudited condensed consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial information. Accordingly, they do not include all of the information and footnotes required by GAAP for annual financial statements. In the opinion of management, all necessary adjustments (which consists of only normal recurring items) have been made to fairly present the condensed consolidated financial statements for the interim periods presented. Results of operations for the three months ended March 31, 2021 are not necessarily indicative of the results that may be expected for the year ending December 31, 2021. These unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2020, as amended, filed with the Securities and Exchange Commission (“SEC”). The Company is an “emerging growth company” (“EGC”), as defined in Section 2(a) of the Securities Act, as modified by the Jumpstart Our Business Startups Act of 2012 (the “JOBS Act”), following the consummation of the merger of CFAC and the Company. The Company has elected to use this extended transition period for complying with new or revised accounting standards pursuant to Section 102(b)(1) of the JOBS Act that have different effective dates for public and private companies until the earlier of the date that it (i) is no longer an emerging growth company or (ii) affirmatively and irrevocably opts out of the extended transition periods provided by the JOBS Act. As result of this election, its consolidated financial statements may not be comparable to companies that comply with new or revised accounting pronouncements as of public company effective dates. COVID-19 In March 2020, the World Health Organization declared the outbreak of a novel coronavirus (“COVID-19”) a global pandemic, which has resulted in significant disruption and uncertainty in the global economic markets. Given the amount of uncertainty currently regarding the scope and duration of the COVID-19 pandemic, the Company is unable to predict the precise impact the COVID-19 pandemic will have on the Company’s consolidated financial statements. In line with public markets and credit indices, the Company investments may be adversely impacted. Fair Value Measurements The Company categorizes its fair value measurements according to a three-level hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). The three levels of the fair value hierarchy are defined as follows: • Level 1 – Inputs that reflect unadjusted quoted prices in active markets for identical assets or liabilities that the Company has the ability to access at the measurement date; • Level 2 – Inputs other than quoted prices that are observable for the asset or liability either directly or indirectly, including inputs in markets that are not considered to be active; and • Level 3 – Inputs that are unobservable. Observable inputs are inputs that market participants would use in pricing the asset or liability developed based on market data obtained from sources independent of the Company. Unobservable inputs are inputs that reflect the Company’s assumptions about the assumptions market participants would use in pricing the asset or liability developed based on the best information available in the circumstances. The carrying amount of cash and cash equivalents and fees receivable approximate fair value due to the immediate or short-term maturity of these financial instruments. Investments The Company’s investments in the GCM Funds investing in private equity, real estate and infrastructure (“GCM PEREI Funds”) are valued based on the most recent available information which typically has a delay of up to three months due to the timing of financial information received from the investments held by the GCM PEREI Funds. The Company records its share of capital contributions to and distributions from the GCM PEREI Funds within investments in the Condensed Consolidated Statements of Financial Condition during the three-month lag period. To the extent that management is aware of material events that affect the GCM PEREI Funds during the intervening period, the impact of the events would be disclosed in the notes to the condensed consolidated financial statements. Equity-Based Compensation The Company accounts for grants of equity-based awards, including restricted stock units (“RSUs”), at fair value as of the grant date. Each RSU represents the right to receive payment in the form of one share of Class A common stock or an amount equal to the market value of one share of Class A common stock. Holders of unvested RSUs do not have the right to vote with the underlying shares of Class A common stock, but are entitled to accrue dividend equivalents which are generally paid in cash when such RSUs are delivered. The Company recognizes non-cash compensation expense attributable to these grants on a straight-line basis over the requisite service period, which is generally the vesting period. Expenses related to grants of equity-based awards are recorded within employee compensation and benefits in the Condensed Consolidated Statements of Income and are recorded within additional paid-in capital in the Condensed Consolidated Statements of Financial Condition . The fair value of RSUs is determined by the closing stock price on the grant date. Awards the Company intends to settle in cash are classified as liabilities within employee related obligations in the Condensed Consolidated Statements of Financial Condition and are subsequently remeasured to the closing stock price as of each reporting date through the payment date with the changes in value recorded within employee compensation and benefits in the Condensed Consolidated Statements of Income . Forfeitures of equity-based awards are recognized as they occur. See Note 12 , for additional information regarding the Company’s equity-based compensation. Recently Issued Accounting Standards In January 2021, the FASB issued Accounting Standards Updated (“ASU”) 2021-01, Reference Rate Reform (Topic 848) and in March 2020, the FASB issued ASU 2020-04, Reference Rate Reform (Topic 848) . The amendments in these updates provide optional guidance for a limited amount of time to ease the burden on companies in accounting for reference rate reform. The amendments also clarify that the optional expedients and exceptions apply to derivatives that are being implemented as part of the market-wide transition to new reference rates. The method of adoption varies for the updates included in the ASUs. The Company is currently evaluating the impact on its consolidated financial statements upon adoption of the reference rate reform standards. In December 2019, the FASB issued ASU 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes , which modifies ASC 740 to simplify the accounting for income taxes. The guidance, among other changes, (i) provides a policy election to not allocate consolidated income taxes when a member of a consolidated tax return is not subject to income tax and (ii) provides guidance to evaluate whether a step-up in tax basis of goodwill relates to a business combination in which book goodwill was recognized or a separate transaction. The amendments in this ASU are effective for public business entities for fiscal years beginning after December 15, 2020. For all other entities, the amendments are effective for fiscal years beginning after December 15, 2021, and interim periods within fiscal years beginning after December 15, 2022. Early adoption of the amendments is permitted, including adoption in any interim period for (1) public business entities for periods for which financial statements have not yet been issued and (2) all other entities for periods for which financial statements have not yet been made available for issuance. The Company will defer adoption until the guidance is effective for non-public entities, as the Company currently qualifies as an EGC and has elected to take advantage of the extended transition period afforded to EGCs as it applies to the adoption of new accounting standards. The amendments related to changes in ownership of foreign equity method investments or foreign subsidiaries should be applied on a modified retrospective basis through a cumulative-effect adjustment to retained earnings as of the beginning of the fiscal year of adoption. The amendments related to franchise taxes that are partially based on income should be applied on either a retrospective basis for all periods presented or a modified retrospective basis through a cumulative-effect adjustment to retained earnings as of the beginning of the fiscal year of adoption. All other amendments should be applied on a prospective basis. The Company is currently evaluating the impact on its consolidated financial statements upon adoption of this standard. In October 2018, the FASB issued ASU 2018-17, Consolidation (Topic 810): Targeted Improvements to Related Party Guidance for Variable Interest Entities , which reduces the cost and complexity of financial reporting associated with consolidation of VIEs. The amendment provides that indirect interests held through related parties in common control arrangements should be considered on a proportional basis for determining whether fees paid to decision makers and service providers are variable interests. The amendments in this ASU are effective for public business entities with fiscal years beginning after December 15, 2019 and interim periods within those reporting periods, and effective for non-public entities with fiscal years beginning after December 15, 2020 and interim periods within fiscal years beginning after December 15, 2021, with early adoption permitted. The Company will defer adoption until the guidance is effective for non-public entities, as the Company currently qualifies as an EGC and has elected to take advantage of the extended transition period afforded to EGCs as it applies to the adoption of new accounting standards. The guidance should be applied prospectively. The Company has concluded this guidance will not have a material impact on its consolidated financial statements. In January 2017, the FASB issued ASU 2017-04, Intangibles — Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment . Currently, the standard requires an entity to perform a two-step test to determine the amount, if any, of goodwill impairment. In Step 1, an entity compares the fair value of a reporting unit with its carrying amount, including goodwill. If the carrying amount of the reporting unit exceeds its fair value, the entity performs Step 2 and compares the implied fair value of goodwill with the carrying amount of that goodwill for that reporting unit. An impairment charge equal to the amount by which the carrying amount of goodwill for the reporting unit exceeds the implied fair value of that goodwill is recorded, limited to the amount of goodwill allocated to that reporting unit. The new guidance removes Step 2. An entity will apply a one-step quantitative test and record the amount of goodwill impairment as the excess of a reporting unit’s carrying amount over its fair value, not to exceed the total amount of goodwill allocated to the reporting unit. The new guidance does not amend the optional qualitative assessment of goodwill impairment. An entity will apply the new guidance on a prospective basis. The amendments in this ASU are effective for public business entities that are a U.S. Securities and Exchange Commission (“SEC”) filer, excluding entities eligible to be smaller reporting companies as defined by the SEC, with fiscal years beginning after December 15, 2019. All other entities should adopt the amendments in this ASU in fiscal years beginning after December 15, 2022. Early adoption is permitted for annual goodwill impairment tests performed on testing dates after January 1, 2017. The Company early adopted this standard on April 1, 2021 under a prospective approach. The adoption did not have a material impact on the Company’s consolidated financial statements. In June 2016, the FASB issued ASU 2016-13, Financial Instruments — Credit Losses (Topic 326) Measurement of Credit Losses on Financial Instruments . ASU 2016-13 requires an entity to utilize a new impairment model known as the current expected credit loss (“CECL”) model to estimate its lifetime “expected credit loss” and record an allowance that, when deducted from the amortized cost basis of the financial asset, presents the net amount expected to be collected on the financial asset. The CECL model is expected to result in more timely recognition of credit losses. ASU 2016-13 also requires new disclosures for financial assets measured at amortized cost, loans and available-for-sale debt securities. This guidance is for public business entities that are an SEC filer, excluding entities eligible to be smaller reporting companies as defined by the SEC, with fiscal years beginning after December 15, 2019. On March 9, 2020, the FASB extended the adoption date for all other entities to annual periods beginning after December 15, 2022, including interim periods within those fiscal years, with early adoption permitted. The Company is still evaluating this guidance but currently expects that adoption will not have a material impact on its consolidated financial statements. In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842)

Business Combination

Business Combination	3 Months Ended
	Mar. 31, 2021
Business Combinations [Abstract]
Business Combination	Business Combination On November 17, 2020, the Company consummated a business combination pursuant to the definitive Transaction Agreement dated as of August 2, 2020, by and among CFAC, IntermediateCo, CF Finance Holdings, LLC (the “CF Sponsor”), Holdings, Management LLC, Holdings II, GCMH GP, L.L.C (“GCMHGP LLC”), GCM V, LLC (“GCM V”) and the Company (the “Transaction”). The Transaction was treated as a transaction between entities under common control. Following the consummation of the Transaction, GCMG indirectly holds general partnership and limited partnership interests in GCMH. The structure of the Transaction is an “Up-C” structure with the owners of GCMH retaining their ownership in GCMH.

Mosaic Transaction

Mosaic Transaction	3 Months Ended
	Mar. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Mosaic Transaction	Mosaic Transaction Effective January 1, 2020, the Partnership and several subsidiaries, (collectively, the “Seller”) entered into a Purchase and Sale Agreement (“Agreement”) and issued certain limited partnership interests in several subsidiaries (“Carry Plan Entities”) to Mosaic Acquisitions 2020, L.P. (“Mosaic”). In addition, Mosaic also acquired the rights to receive a percentage of carried interest from certain GCM Funds and agreed to provide additional funding under certain circumstances up to a maximum amount as defined in the Agreement (collectively, the “Mosaic Transaction”). Mosaic issued Class A and Class B equity interests to GCMH, Holdings and Mosaic Feeder, L.P. (“Mosaic Feeder”). The Partnership serves as the general partner of Mosaic, which was consolidated as the Partnership holds a controlling financial interest in Mosaic. Mosaic Feeder is beneficially owned by Lakeshore Investments GP, LLC (“Lakeshore”), a related party, and an unaffiliated third-party investor (“Mosaic Counterparty”) and is not consolidated. The consideration transferred by Mosaic Counterparty to the Seller for the interests acquired was $125.4 million. In addition, the Seller received an additional $48.0 million to fund future investment commitments. Additionally, the Seller could be required to pay additional amounts as long as Mosaic Feeder has an ownership interest in the transferred interests (“Potential Payments”) based on cash flow up to the relevant dates as defined in the Agreement that could total up to a maximum of $19.9 million, which is broken down as a maximum of $4.9 million on December 31, 2020, $7.5 million on December 31, 2021 and $7.5 million on December 31, 2022. GCMH made a payment of $4.9 million on December 31, 2020 . Such amounts can be reduced (not below zero) by exceeding certain cumulative distribution thresholds at each relevant date. In addition, any such amounts paid to Mosaic will also reduce, on a dollar-for-dollar basis, the purchase price payable upon exercise of the Put Option. On December 31, 2020, the Company paid $2.6 million to Mosaic Feeder for the right, but not the obligation, to require Mosaic Feeder to sell to GCMH all of the Class A and Class B equity interests held by Mosaic Feeder in Mosaic (the “Mosaic Call Right”) for a purchase price equal to the greater of 1.3x its investment or a 12% IRR on its investment. Further, Mosaic Counterparty has the right, but not the obligation, to require the Partnership to acquire all of the Class A and Class B Interests held by Mosaic Feeder in Mosaic (the “Put Option”) for a purchase price equal to Mosaic Counterparty receiving the greater of 1.3x of its investment or a 12% IRR on its investment (the “Put Price”). The Put Option could only be exercised if a Triggering Event as defined in the Agreement occurs, which management had deemed to be remote. If the Partnership declines to pay the Put Price, Mosaic Counterparty may either step in and act as the general partner of Mosaic and control Mosaic until Mosaic Counterparty recoups the Put Price or effect a transfer of the underlying assets of Mosaic to Mosaic Counterparty. Management determined that the Mosaic Transaction should be evaluated under the guidance in ASC 810 and concluded that Mosaic is accounted for as a VIE. The Partnership was deemed the primary beneficiary and therefore consolidates Mosaic. In addition, the Partnership concluded that the Put Option was embedded in an equity host contract but did not meet the net settlement criterion of an embedded derivative and therefore no separate accounting was required. However, as the Put Option was not solely within the control of the Partnership, the noncontrolling interest related to Mosaic had been classified as mezzanine equity. The total assets of Mosaic were $96.5 million and $101.4 million as of March 31, 2021 and December 31, 2020, respectively, and were recorded within cash and cash equivalents and investments in the Condensed Consolidated Statements of Financial Condition . Mosaic had no liabilities as of March 31, 2021 and December 31, 2020 . The assets of Mosaic may only be used to settle obligations of Mosaic, if any. In addition, there was no recourse to the Partnership for Mosaic’s liabilities, except for certain entities in which there could be a clawback of previously distributed carried interest. The Company consolidates certain VIEs in which it is determined that the Company is the primary beneficiary. The Company holds variable interests in certain entities that are VIEs, which are not consolidated, as it is determined that the Company is not the primary beneficiary. The Company’s involvement with such entities is generally in the form of direct equity interests in, and fee arrangements with, the entities in which it also serves as the general partner or managing member. The Company evaluated its variable interests in the VIEs and determined it is not considered the primary beneficiary of the entities primarily because it does not have interests in the entities that could potentially be significant. No reconsideration events that caused a change in the Company’s consolidation conclusions occurred during either the three months ended March 31, 2021 or the year ended December 31, 2020. As of March 31, 2021 and December 31, 2020, the total unfunded commitments from the limited partners and general partners to the unconsolidated VIEs were $26.6 million and $32.8 million, respectively. These commitments are the primary source of financing for the unconsolidated VIEs. The following table sets forth certain information regarding the VIEs in which the Company holds a variable interest but does not consolidate. The assets recognized on the Company’s Condensed Consolidated Statements of Financial Condition related to the Company’s interests in and management, incentive fees and third party costs receivables from these non-consolidated VIEs and the Company’s maximum exposure to loss relating to non-consolidated VIEs as of March 31, 2021 and December 31, 2020 were as follows: As of March 31, 2021 December 31, 2020 Investments $ 79,472 $ 77,511 Receivables 13,892 14,322 Maximum exposure to loss $ 93,364 $ 91,833 The above table includes investments in VIEs which are owned by noncontrolling interest holders of approximately $79.4 million and $77.4 million as of March 31, 2021 and December 31, 2020, respectively.

Revenue

Revenue	3 Months Ended
	Mar. 31, 2021
Revenue from Contract with Customer [Abstract]
Revenue	Revenue For the three months ended March 31, 2021 and 2020, revenues consisted of the following: Three Months Ended March 31, Management fees 2021 2020 Management fees, net $ 80,265 $ 75,727 Fund expense reimbursement revenue 2,360 1,974 Management fees $ 82,625 $ 77,701 Three Months Ended March 31, Incentive fees 2021 2020 Performance fees $ 6,113 $ 605 Carried interest 12,101 2,628 Total incentive fees $ 18,214 $ 3,233 The Company recognized revenues of $1.0 million and $0.4 million during the three months ended March 31, 2021 and 2020, respectively, that were previously received and deferred as of December 31, 2020 and 2019, respectively.

Investments

Investments	3 Months Ended
	Mar. 31, 2021
Equity Method Investments and Joint Ventures [Abstract]
Investments	Investments Investments consist of the following: As of March 31, 2021 December 31, 2020 Equity method investments $ 179,529 $ 165,095 Other investments 1,179 1,178 Total investments $ 180,708 $ 166,273 As of March 31, 2021 and December 31, 2020, the Company held investments of $180.7 million and $166.3 million, respectively, of which $175.7 million and $161.9 million were owned by noncontrolling interest holders, respectively. Future net income (loss) and cash flow from investments held by noncontrolling interest holders will not be attributable to the Company.

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2021
Fair Value Disclosures [Abstract]
Fair Value Disclosures	Fair Value Measurements The following table summarizes the Company’s assets and liabilities measured at fair value on a recurring basis and level of inputs used for such measurements as of March 31, 2021 and December 31, 2020: Fair Value of Assets (Liabilities) as of March 31, 2021 Level 1 Level 2 Level 3 Total Money market funds $ 109,054 $ — $ — $ 109,054 Interest rate derivatives — 2,930 — 2,930 Public warrants (21,621) — — (21,621) Private warrants — — (4,428) (4,428) Total $ 87,433 $ 2,930 $ (4,428) $ 85,935 Fair Value of Assets (Liabilities) as of December 31, 2020 Level 1 Level 2 Level 3 Total Money market funds $ 149,553 $ — $ — $ 149,553 Interest rate derivatives — (28,442) — (28,442) Public warrants (36,421) — — (36,421) Private warrants — — (6,372) (6,372) Total $ 113,132 $ (28,442) $ (6,372) $ 78,318 Money market funds are valued using quoted market prices and are included in cash and cash equivalents in the Condensed Consolidated Statements of Financial Condition. Management determines the fair value of its interest rate derivative agreements based on the present value of expected future cash flows based on observable future LIBOR rates applicable to each swap contract using linear interpolation, inclusive of the risk of non-performance, using a discount rate appropriate for the duration. The public warrants are valued using quoted market prices on the Nasdaq Stock Market LLC under the ticker GCMGW. Management determines the fair value of the private warrants using a binomial option valuation model (“Valuation Model”). The private warrants are classified as Level 3 as of March 31, 2021 and December 31, 2020, respectively, because of the use of significant unobservable inputs in the Valuation Model. The significant unobservable inputs into the Valuation Model for the private warrants are as follows: March 31, 2021 December 31, 2020 Risk-free interest rate 0.81 % 0.35 % Expected term (years) 4.6 4.9 Expected volatility 19 % 16 % The Company’s use of the Valuation Model required the use of the following assumptions: • The risk-free interest rate assumption was based on the term-matched U.S. Treasury rate, which was commensurate with the contractual term of the private warrants, which expire on the earlier of five years after the completion of the Transaction or liquidation of the Company. An increase in the risk-free interest rate, in isolation, would result in an increase in the fair value measurement of the warrant liabilities and vice versa. • The expected term was determined to be approximately 5 years, which is commensurate with the contractual maximum term of the private warrants, which expire on the earlier of five years after the completion of the Transaction or liquidation of the Company. A decrease in the expected term, in isolation, would result in an decrease in the fair value measurement of the warrant liabilities. • The expected volatility assumption was based on consideration of the implied volatility from the Company’s publicly-traded warrants and the historical and implied volatility of the Company’s publicly-traded industry peers. An increase in the expected volatility, in isolation, would result in an increase in the fair value measurement of the warrant liabilities. The resulting valuation for the private warrants were determined to be $1.64 and $2.36 per unit as of March 31, 2021 and December 31, 2020, respectively. The resulting fair value of $4.4 million and $6.4 million was recorded within warrant liabilities in the Condensed Consolidated Statements of Financial Condition as of March 31, 2021 and December 31, 2020, respectively. The following table presents changes in Level 3 liabilities measured at fair value for the three months ended March 31, 2021: Three Months Ended March 31, 2021 Balance at beginning of period $ (6,372) Change in fair value 1,944 Balance at end of period $ (4,428)

Equity

Equity	3 Months Ended
	Mar. 31, 2021
Equity [Abstract]
Equity	Equity The following table shows a rollforward of the common stock outstanding since December 31, 2020: Class A common stock Class B common stock Class C common stock December 31, 2020 40,835,093 — 144,235,246 Exercise of warrants 1,793,903 — — March 31, 2021 42,628,996 — 144,235,246 Dividends are reflected in the Condensed Consolidated Statements of Equity (Deficit) when declared by the board of directors. On February 25, 2021, the Company declared a quarterly dividend of $0.08 per share to be paid on June 15, 2021 to Class A common stock record holders at the close of business on June 1, 2021. On March 15, 2021 a dividend of $0.06 per share was paid to Class A common stock record holders at the close of business on March 1, 2021. Dividend equivalent payments of $0.7 million were accrued for holders of RSUs for the three months ended March 31, 2021. Distributions to partners represent distributions made to GCMH Equityholders.

Warrants

Warrants	3 Months Ended
	Mar. 31, 2021
Other Liabilities Disclosure [Abstract]
Warrants	Warrants Public Warrants As of March 31, 2021 and December 31, 2020, the Company had 18,479,664 and 20,273,567 shares of public warrants outstanding, respectively. Private Placement Warrants As of each of March 31, 2021 and December 31, 2020, the Company had 2,700,000 shares of private placement warrants outstanding. Exercise of Warrants

Variable Interest Entities

Variable Interest Entities	3 Months Ended
	Mar. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Variable Interest Entities	Mosaic Transaction Effective January 1, 2020, the Partnership and several subsidiaries, (collectively, the “Seller”) entered into a Purchase and Sale Agreement (“Agreement”) and issued certain limited partnership interests in several subsidiaries (“Carry Plan Entities”) to Mosaic Acquisitions 2020, L.P. (“Mosaic”). In addition, Mosaic also acquired the rights to receive a percentage of carried interest from certain GCM Funds and agreed to provide additional funding under certain circumstances up to a maximum amount as defined in the Agreement (collectively, the “Mosaic Transaction”). Mosaic issued Class A and Class B equity interests to GCMH, Holdings and Mosaic Feeder, L.P. (“Mosaic Feeder”). The Partnership serves as the general partner of Mosaic, which was consolidated as the Partnership holds a controlling financial interest in Mosaic. Mosaic Feeder is beneficially owned by Lakeshore Investments GP, LLC (“Lakeshore”), a related party, and an unaffiliated third-party investor (“Mosaic Counterparty”) and is not consolidated. The consideration transferred by Mosaic Counterparty to the Seller for the interests acquired was $125.4 million. In addition, the Seller received an additional $48.0 million to fund future investment commitments. Additionally, the Seller could be required to pay additional amounts as long as Mosaic Feeder has an ownership interest in the transferred interests (“Potential Payments”) based on cash flow up to the relevant dates as defined in the Agreement that could total up to a maximum of $19.9 million, which is broken down as a maximum of $4.9 million on December 31, 2020, $7.5 million on December 31, 2021 and $7.5 million on December 31, 2022. GCMH made a payment of $4.9 million on December 31, 2020 . Such amounts can be reduced (not below zero) by exceeding certain cumulative distribution thresholds at each relevant date. In addition, any such amounts paid to Mosaic will also reduce, on a dollar-for-dollar basis, the purchase price payable upon exercise of the Put Option. On December 31, 2020, the Company paid $2.6 million to Mosaic Feeder for the right, but not the obligation, to require Mosaic Feeder to sell to GCMH all of the Class A and Class B equity interests held by Mosaic Feeder in Mosaic (the “Mosaic Call Right”) for a purchase price equal to the greater of 1.3x its investment or a 12% IRR on its investment. Further, Mosaic Counterparty has the right, but not the obligation, to require the Partnership to acquire all of the Class A and Class B Interests held by Mosaic Feeder in Mosaic (the “Put Option”) for a purchase price equal to Mosaic Counterparty receiving the greater of 1.3x of its investment or a 12% IRR on its investment (the “Put Price”). The Put Option could only be exercised if a Triggering Event as defined in the Agreement occurs, which management had deemed to be remote. If the Partnership declines to pay the Put Price, Mosaic Counterparty may either step in and act as the general partner of Mosaic and control Mosaic until Mosaic Counterparty recoups the Put Price or effect a transfer of the underlying assets of Mosaic to Mosaic Counterparty. Management determined that the Mosaic Transaction should be evaluated under the guidance in ASC 810 and concluded that Mosaic is accounted for as a VIE. The Partnership was deemed the primary beneficiary and therefore consolidates Mosaic. In addition, the Partnership concluded that the Put Option was embedded in an equity host contract but did not meet the net settlement criterion of an embedded derivative and therefore no separate accounting was required. However, as the Put Option was not solely within the control of the Partnership, the noncontrolling interest related to Mosaic had been classified as mezzanine equity. The total assets of Mosaic were $96.5 million and $101.4 million as of March 31, 2021 and December 31, 2020, respectively, and were recorded within cash and cash equivalents and investments in the Condensed Consolidated Statements of Financial Condition . Mosaic had no liabilities as of March 31, 2021 and December 31, 2020 . The assets of Mosaic may only be used to settle obligations of Mosaic, if any. In addition, there was no recourse to the Partnership for Mosaic’s liabilities, except for certain entities in which there could be a clawback of previously distributed carried interest. The Company consolidates certain VIEs in which it is determined that the Company is the primary beneficiary. The Company holds variable interests in certain entities that are VIEs, which are not consolidated, as it is determined that the Company is not the primary beneficiary. The Company’s involvement with such entities is generally in the form of direct equity interests in, and fee arrangements with, the entities in which it also serves as the general partner or managing member. The Company evaluated its variable interests in the VIEs and determined it is not considered the primary beneficiary of the entities primarily because it does not have interests in the entities that could potentially be significant. No reconsideration events that caused a change in the Company’s consolidation conclusions occurred during either the three months ended March 31, 2021 or the year ended December 31, 2020. As of March 31, 2021 and December 31, 2020, the total unfunded commitments from the limited partners and general partners to the unconsolidated VIEs were $26.6 million and $32.8 million, respectively. These commitments are the primary source of financing for the unconsolidated VIEs. The following table sets forth certain information regarding the VIEs in which the Company holds a variable interest but does not consolidate. The assets recognized on the Company’s Condensed Consolidated Statements of Financial Condition related to the Company’s interests in and management, incentive fees and third party costs receivables from these non-consolidated VIEs and the Company’s maximum exposure to loss relating to non-consolidated VIEs as of March 31, 2021 and December 31, 2020 were as follows: As of March 31, 2021 December 31, 2020 Investments $ 79,472 $ 77,511 Receivables 13,892 14,322 Maximum exposure to loss $ 93,364 $ 91,833 The above table includes investments in VIEs which are owned by noncontrolling interest holders of approximately $79.4 million and $77.4 million as of March 31, 2021 and December 31, 2020, respectively.

Employee Compensation and Benef

Employee Compensation and Benefits	3 Months Ended
	Mar. 31, 2021
Compensation Related Costs [Abstract]
Employee Compensation and Benefits	Employee Compensation and Benefits For the three months ended March 31, 2021 and 2020, employee compensation and benefits consisted of the following: Three Months Ended March 31, 2021 2020 Cash-based employee compensation and benefits $ 41,780 $ 44,302 Equity-based compensation 27,036 — Partnership interest-based compensation 4,903 7,920 Carried interest compensation 6,860 2,190 Cash-based incentive fee related compensation 1,833 — Other 941 1,065 Total employee compensation and benefits $ 83,353 $ 55,477 Partnership Interest in Holdings, Holdings II and Management LLC Payments to the employees for partnership interest awards are made by Holdings, Holdings II and Management LLC. As a result, the Company records a non-cash profits interest compensation charge and an offsetting deemed contribution to equity (deficit) to reflect the payments made by the GCMH Equityholders. As the payments are made by Holdings, Holdings II and Management LLC, the expense that is pushed down to GCMH and the offsetting deemed contribution are each attributed solely to noncontrolling interest in GCMH. Any liability related to the awards is recognized at Holdings, Holdings II or Management LLC as Holdings, Holdings II or Management LLC is the party responsible for satisfying the obligation, and is not shown in the Company’s condensed consolidated financial statements. The Company has recorded deemed contributions to equity (deficit) from Holdings, Holdings II and Management LLC of approximately $4.9 million and $7.9 million for the three months ended March 31, 2021 and 2020, respectively, for partnership interested-based compensation expense which will ultimately be paid by Holdings, Holdings II or Management LLC. The Company has modified awards to certain individuals upon their voluntary retirement or intention to retire as employees. These awards generally include a stated target amount that upon payment terminates the recipient’s rights to future distributions and allows for a lump sum buy-out of the awards, at the discretion of the managing member of Holdings, Holdings II, and Management LLC. The awards are accounted for as partnership interest-based compensation at the fair value of these expected future payments, in the period the employees accepted the offer. Partnership interest-based compensation expense of $1.6 million and $3.7 million was recognized for the three months ended March 31, 2021 and 2020, respectively, related to award modifications. The liability associated with awards that contain a stated target has been retained by Holdings as of March 31, 2021 and December 31, 2020, respectively, and is re-measured at each reporting date, with any corresponding changes in liability being reflected as employee compensation and benefits expense of the Company. Certain recipients had unvested stated target payments of $10.9 million and $9.2 million for the three months ended March 31, 2021 and 2020, respectively, which has not been reflected as employee compensation and benefits expense by the Company. The Company recognized partnership interest-based compensation expense of $3.3 million and $4.2 million for the three months ended March 31, 2021 and 2020, respectively, related to profits interest awards that are in substance profit-sharing arrangements. Other Other consists of employee compensation and benefits expense related to deferred compensation programs and other awards that represent investments made in GCM Funds on behalf of the employees.

Equity-Based Compensation

Equity-Based Compensation	3 Months Ended
	Mar. 31, 2021
Equity [Abstract]
Equity-Based Compensation	Equity-Based Compensation 2020 Incentive Award Plan The Company adopted the 2020 Incentive Award Plan, which allows for the granting of stock options, stock appreciation rights, restricted stock awards, restricted stock units, and other stock or cash based awards or dividend equivalent awards to employees, directors and consultants. Restricted Stock Units During the three months ended March 31, 2021, the Company granted 4.8 million RSUs to certain employees and directors as part of the bonus program and in connection with the Transaction. Of the RSUs granted, the Company intends to settle less than 0.1 million RSUs in cash. The RSUs had an aggregate grant date fair value of $62.1 million. Of the 4.8 million RSUs granted, 2.0 million vested at the grant date and 2.8 million vest over two years in equal annual installments. Upon delivery, which is expected to occur each August following each annual vesting in March, the Company may withhold the number of shares to satisfy the statutory withholding tax obligation and deliver the net number of resulting shares vested. A summary of RSU activity for the three months ended March 31, 2021 is as follows: Number of RSUs Weighted-Average Grant-Date Fair Value Per RSUs Balance as of December 31, 2020 — $ — Granted 4,759,375 13.04 Vested (1,952,685) 13.04 Forfeited — — Balance as of March 31, 2021 2,806,690 $ 13.04

Debt

Debt	3 Months Ended
	Mar. 31, 2021
Debt Disclosure [Abstract]
Debt	Debt The table below summarizes the outstanding debt balance as of March 31, 2021 and December 31, 2020. As of March 31, 2021 December 31, 2020 Senior loan $ 290,000 $ 340,259 Less debt issuance costs (5,018) (5,104) Total debt $ 284,982 $ 335,155 Maturities of debt for the next five years and thereafter are as follows: Year Ending December 31, Remainder of 2021 $ 2,175 2022 2,900 2023 2,900 2024 2,900 2025 2,900 Thereafter 276,225 Total $ 290,000 Senior Loan On January 2, 2014, the Company entered into a senior secured term loan facility (“Senior Loan”), which was subsequently amended through several debt modifications. On February 24, 2021, the Company completed an amendment and extension of its Senior Loan to further extend the maturity (“Amended Credit Agreement”). Approximately $290.0 million of the aggregate principal amount of the Senior Loan was extended from a maturity date of March 29, 2025 (the “2025 Term Loans”) to a maturity date of February 24, 2028 , (as extended, the “2028 Term Loans”). The 2028 Term Loans have an interest rate of 2.50% over the LIBOR, subject to a 0.50% LIBOR floor. The Company accounted for the amendments of its Senior Loan as a debt modification as the amendments were with the same lenders and the changes in terms did not cause the debt instruments to be considered “substantially different”. Concurrently with the effectiveness of the Amended Credit Agreement, the Company made a voluntary prepayment on the Senior Loan in an aggregate principal amount of $50.3 million. As a result of the prepayment, the Company recorded an expense of $0.7 million related to the acceleration of deferred debt issuance costs, which is recorded within other income (expense) in the Condensed Consolidated Statements of Income. The Company capitalized $0.9 million of issuances costs related to payments to lenders in connection with the amendment and extension of its Senior Loan, which is recorded within debt in the Condensed Consolidated Statements of Financial Condition, and expensed $2.6 million of third-party costs related to the amendment which is recorded within general, administrative and other in the Condensed Consolidated Statements of Income. Effective February 24, 2021, quarterly principal payments of $725 thousand are required to be made toward the 2028 Term Loans beginning June 30, 2021 (less any reduction for prior or future voluntary or mandatory prepayments of principal). In addition to the scheduled principal repayments, the Company is required to offer to make prepayments of Consolidated Excess Cash Flow (“Cash Flow Payments”) no later than five days following the date the quarterly financial statements are due if the leverage ratio exceeds 2.50x. The Cash Flow Payments were calculated as defined in the Senior Loan agreement based on a percentage of calculated excess cash. During the three months ended March 31, 2021, the Company did not make any Cash Flow Payments. As of March 31, 2021 and December 31, 2020, $290.0 million of 2028 Term Loans and $340.3 million of 2025 Term Loans were outstanding with weighted average interest rates of 3.81% and 3.98%, respectively. Under the credit and guaranty agreement governing the terms of the Senior Loan, the Company must maintain certain leverage and interest coverage ratios. The credit and guaranty agreement also contains other covenants that, among other things, restrict the ability of the Company and its subsidiaries to incur debt and restrict the Company and its subsidiaries ability to merge or consolidate, or sell or convey all or substantially all of the Company’s assets. As of March 31, 2021 and December 31, 2020, the Company was in compliance with all covenants. GCMH Equityholders and IntermediateCo have executed a pledge agreement (“Pledge Agreement”) and security agreement (“Security Agreement”) with the lenders of the Senior Loan. Under the Pledge Agreement, GCMH Equityholders and IntermediateCo have agreed to secure the obligations under the Senior Loan by pledging its interests in GCMH as collateral against the repayment of the senior secured notes, and GCMH has agreed to secure the obligations under the Senior Loan by granting a security interest in and continuing lien on the collateral described in the Security Agreement. The Pledge Agreement and Security Agreement will remain in effect until such time as all obligations relating to the Senior Loan have been fulfilled. Credit Facility Concurrent with the issuance of the Senior Loan, the Company entered into a $50 million revolving credit facility (“Credit Facility”). The Credit Facility matures on February 24, 2026 and carries an unused commitment fee that is paid quarterly. There were no outstanding borrowings related to the Credit Facility as of each of March 31, 2021 and December 31, 2020. Other Certain subsidiaries of the Company agree to jointly and severally guarantee, as primary obligor and not merely as surety guarantee the obligations of their parent entity, GCMH. Amortization of the deferred costs was approximately $0.3 million and $0.9 million for the three months ended March 31, 2021 and 2020, respectively, and is recorded within interest expense in the Condensed Consolidated Statements of Income. The carrying value of the Senior Loan, excluding the unamortized debt issuance costs presented as a reduction to the principal balance, approximated the fair value as of March 31, 2021 and December 31, 2020 . As the Senior Loan was not accounted for at fair value, it was not included in the Company’s fair value hierarchy in Note 7,

Interest Rate Derivatives

Interest Rate Derivatives	3 Months Ended
	Mar. 31, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Interest Rate Derivatives	Interest Rate Derivatives The Company has entered into various derivative agreements with financial institutions to hedge interest rate risk related to its outstanding debt. The Company had the following interest rate derivatives recorded as an asset within other assets in the Condensed Consolidated Statements of Financial Condition as of March 31, 2021 and as a liability within accrued expenses and other liabilities in the Condensed Consolidated Statements of Financial Condition as of December 31, 2020: As of March 31, 2021 Derivative Notional Amount Fair Value as of March 31, 2021 Fixed Rate Paid Floating Rate Received Effective Date (2) Maturity Date Interest rate swap $ 232,000 $ 2,930 1.33 % 1 month LIBOR (1) March 2021 February 2028 ____________ (1) Floating rate received subject to a 0.50% Floor (2) Represents the date at which the derivative is in effect and the Company is contractually required to begin payment of interest under the terms of the agreement. As of December 31, 2020 Derivative Notional Amount Fair Value as of December 31, 2020 Fixed Rate Paid Floating Rate Received Effective Date (3) Maturity Date Interest rate swap $ 225,000 $ (11,163) 2.48 % 1 month LIBOR (1) January 2020 February 2023 Interest rate swap 75,000 (4,654) 3.05 % 1 month LIBOR (1) January 2020 February 2023 Interest rate collar 300,000 (12,625) 3.70 % 1 month LIBOR (2) February 2023 February 2025 $ (28,442) ____________ (1) Floating rate received subject to a 0.00% Floor (2) Floating rate received subject to a 2.45% Floor (3) Represents the date at which the derivative is in effect and the Company is contractually required to begin payment of interest under the terms of the agreement. A rollforward of the amounts in accumulated other comprehensive income (loss) (“AOCI”) related to interest rate derivatives designated as cash flow hedges as follows: Three Months Ended March 31, 2021 2020 Unrealized loss at beginning of period, gross $ (11,163) $ (6,933) Cumulative-effect adjustment from adoption of ASU 2017-12 — 650 Amount of recognized in other comprehensive income (loss) 2,559 (7,723) Amount reclassified from accumulated other comprehensive loss to interest expense 1,120 446 Unrealized loss at end of period (7,484) (13,560) Less: Loss attributable to noncontrolling interests in GCMH (5,894) — Unrealized loss at end of period, net $ (1,590) $ (13,560) 14. Interest Rate Derivatives (cont.) The amount of gain (loss) related to interest rate contracts not designated as hedging instruments was recognized as follows: Three Months Ended March 31, 2021 2020 Other income (expense) $ 1,934 $ (8,634) On February 24, 2021, the Company terminated all outstanding derivative instruments. The amount previously recorded as a hedge in AOCI is remaining in AOCI, and will be recorded in interest expense within the Condensed Consolidated Statements of Income over the original life of the swap. Effective on March 1, 2021 , the Company entered into a swap agreement (“2028 Swap Agreement”) with a financial institution to hedge interest rate risk related to payments made during the extended maturity of the 2028 Term Loans that has a notional amount of $232.0 million. The 2028 Swap Agreement and 2028 Term Loans have a 0.50% LIBOR floor. The swap was determined to be an effective cash flow hedge at inception based on a comparison of critical terms. The fair values of the derivatives and interest rate collar are based on observable market inputs and represent the net amount required to terminate the positions, taking into consideration market rates and non-performance risk. Refer to Note 7 for further details.

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Commitments The Company was required to pay a fixed management fee of $0.5 million per year for a five The Company had $81.6 million and $81.8 million of unfunded investment commitments as of March 31, 2021 and December 31, 2020, respectively, representing general partner capital funding commitments to several of the GCM Funds. As of March 31, 2021 and December 31, 2020, $25.0 million and $32.1 million received in the Mosaic Transaction is available to fund such commitments, respectively. Litigation In the normal course of business, the Company may enter into contracts that contain a number of representations and warranties, which may provide for general or specific indemnifications. The Company’s exposure under these contracts is not currently known, as any such exposure would be based on future claims, which could be made against the Company. The Company’s management is not currently aware of any such pending claims and based on its experience, the Company believes the risk of loss related to these arrangements to be remote. From time to time, the Company is a defendant in various lawsuits related to its business. The Company’s management does not believe that the outcome of any current litigation will have a material effect on the Company’s consolidated financial condition or results of operations. 15. Commitments and Contingencies (cont.) Off-Balance Sheet Risks The Company may be exposed to a risk of loss by virtue of certain subsidiaries serving as the general partner of GCM Funds organized as limited partnerships. As general partner of a GCM Fund organized as a limited partnership, the Company’s subsidiaries that serve as the general partner have exposure to risk of loss is not limited to the amount of its investment in such GCM Fund. The Company cannot predict the amount of loss, if any, which may occur as a result of this exposure; however, historically, the Company has not incurred any significant losses and management believes the likelihood is remote that a material loss will occur.

Related Parties

Related Parties	3 Months Ended
	Mar. 31, 2021
Related Party Transactions [Abstract]
Related Parties	Related Parties In regard to the following related party disclosures, the Company’s management cannot be sure that such transactions or arrangements would be the same to the Company if the parties involved were unrelated and such differences could be material. The Company provides certain employees partnership interest awards which are paid by Holdings, Holdings II and Management LLC. Refer to Note 11 for further details. The Company has a sublease agreement with Holdings. Because the terms of the sublease are identical to the terms of the original lease, there is no impact to net income (loss) in the Condensed Consolidated Statements of Income or Condensed Consolidated Statements of Cash Flows. The Company incurs certain costs, primarily related to accounting, client reporting, investment-decision making and treasury-related expenditures, for which it receives reimbursement from the GCM Funds in connection with its performance obligations to provide investment management services. Due from related parties in the Condensed Consolidated Statements of Financial Condition includes net receivables of approximately $8.4 million and $11.2 million as of March 31, 2021 and December 31, 2020, respectively, paid on behalf of affiliated entities that are reimbursable to the Company. Our executive officers, senior professionals, and certain current and former employees and their families invest on a discretionary basis in GCM Funds, which are generally not subject to management fees and performance fees. As of March 31, 2021 and December 31, 2020, such investments and future commitments aggregated $442.0 million and $426.7 million, respectively. Certain employees of the Company have an economic interest in an entity that is the owner and landlord of the building in which the principal headquarters of the Company are located. The Company utilizes the services of an insurance broker to procure insurance coverage, including its general commercial package policy, workers’ compensation and professional and management liability coverage for its directors and officers. Certain members of Holdings have an economic interest in, and relatives are employed by, the Company’s insurance broker. From time to time, certain of the Company’s executive officers utilize a private business aircraft, including an aircraft wholly owned or controlled by members of Holdings. Additionally, the Company arranges for the use of the private business aircraft through a number of charter services, including entities predominantly or wholly owned or controlled by members of Holdings. The Company paid approximately $0.2 million and $0.9 million for the three months ended March 31, 2021, and 2020, respectively, to utilize aircraft and charter services wholly owned or controlled by members of Holdings, which is recorded within general, administrative and other in the Condensed Consolidated Statements of Income.

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2021
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company’s effective tax rate used for interim periods is based on the tax effect of items recorded discretely in the interim period in which those items occur. The effective tax rate is dependent on many factors, including the estimated amount of income subject to income tax and allocation of tax benefit to noncontrolling interest; therefore, the effective tax rate can vary from period to period. The Company evaluates the realizability of its deferred tax asset on a quarterly basis and adjusts the valuation allowance when it is expected a portion of the deferred tax asset may not be realized. The Company’s effective tax rate was (3)% and (7)% for the three months ended March 31, 2021 and 2020, respectively. These rates were different than the statutory rate due to the portion of income allocated to the non-controlling entities, valuation allowance recorded against deferred tax assets and discrete tax adjustments recorded in the periods. As of March 31, 2021, the Company had no unrecognized tax positions and believes there will be no changes to uncertain tax positions within the next 12 months.

Earnings (Loss) Per Share

Earnings (Loss) Per Share	3 Months Ended
	Mar. 31, 2021
Earnings Per Share [Abstract]
Earnings (Loss) Per Share	Earnings (Loss) Per Share The Company analyzed the calculation of earnings (loss) per share for periods prior to the Transaction as described in Note 3 , and determined that it resulted in values that would not be meaningful to the users of the consolidated financial statements. Therefore, earnings (loss) per share information has not been presented for periods prior to the Transaction on November 17, 2020. The following is a reconciliation of basic and diluted earnings (loss) per share from continuing operations for the three months ended March 31, 2021: Three Months Ended March 31, 2021 Numerator for earnings (loss) per share calculation: Net income attributable to GCM Grosvenor Inc. $ 2,547 Exercise of private warrants (431) Exercise of public warrants (2,787) Exchange of Partnership units (9,479) Net loss attributable to common stockholders, diluted (10,150) Denominator for earnings (loss) per share calculation: Weighted-average shares, basic 42,084,366 Exercise of private warrants - incremental shares under the treasury stock method 307,858 Exercise of public warrants - incremental shares under the treasury stock method 2,244,583 Exchange of Partnership units 144,235,246 Weighted-average shares, diluted 188,872,053 Basic EPS Net income attributable to common stockholders, basic $ 2,547 Weighted-average shares, basic 42,084,366 Net income per share attributable to common stockholders, basic $ 0.06 Diluted EPS Net loss attributable to common stockholders, diluted $ (10,150) Weighted-average shares, diluted 188,872,053 Net loss per share attributable to common stockholders, diluted $ (0.05) Shares of the Company’s Class C common stock do not participate in the earnings or losses of the Company and are therefore not participating securities. As such, a separate presentation of basic and diluted earnings (loss) per share of Class C common stock under the two-class method has not been presented. The following outstanding potentially dilutive securities were excluded from the calculation of diluted earnings (loss) per share attributable to common stockholders because their impact would have been antidilutive for the period presented: As of March 31, 2021 Unvested restricted stock units 2,806,690

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2021
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The unaudited condensed consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial information. Accordingly, they do not include all of the information and footnotes required by GAAP for annual financial statements. In the opinion of management, all necessary adjustments (which consists of only normal recurring items) have been made to fairly present the condensed consolidated financial statements for the interim periods presented. Results of operations for the three months ended March 31, 2021 are not necessarily indicative of the results that may be expected for the year ending December 31, 2021. These unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2020, as amended, filed with the Securities and Exchange Commission (“SEC”). The Company is an “emerging growth company” (“EGC”), as defined in Section 2(a) of the Securities Act, as modified by the Jumpstart Our Business Startups Act of 2012 (the “JOBS Act”), following the consummation of the merger of CFAC and the Company. The Company has elected to use this extended transition period for complying with new or revised accounting standards pursuant to Section 102(b)(1) of the JOBS Act that have different effective dates for public and private companies until the earlier of the date that it (i) is no longer an emerging growth company or (ii) affirmatively and irrevocably opts out of the extended transition periods provided by the JOBS Act. As result of this election, its consolidated financial statements may not be comparable to companies that comply with new or revised accounting pronouncements as of public company effective dates.
Fair Value Measurements	Fair Value Measurements The Company categorizes its fair value measurements according to a three-level hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). The three levels of the fair value hierarchy are defined as follows: • Level 1 – Inputs that reflect unadjusted quoted prices in active markets for identical assets or liabilities that the Company has the ability to access at the measurement date; • Level 2 – Inputs other than quoted prices that are observable for the asset or liability either directly or indirectly, including inputs in markets that are not considered to be active; and • Level 3 – Inputs that are unobservable. Observable inputs are inputs that market participants would use in pricing the asset or liability developed based on market data obtained from sources independent of the Company. Unobservable inputs are inputs that reflect the Company’s assumptions about the assumptions market participants would use in pricing the asset or liability developed based on the best information available in the circumstances. The carrying amount of cash and cash equivalents and fees receivable approximate fair value due to the immediate or short-term maturity of these financial instruments.
Investments	Investments The Company’s investments in the GCM Funds investing in private equity, real estate and infrastructure (“GCM PEREI Funds”) are valued based on the most recent available information which typically has a delay of up to three months due to the timing of financial information received from the investments held by the GCM PEREI Funds. The Company records its share of capital contributions to and distributions from the GCM PEREI Funds within investments in the Condensed Consolidated Statements of Financial Condition during the three-month lag period. To the extent that management is aware of material events that affect the GCM PEREI Funds during the intervening period, the impact of the events would be disclosed in the notes to the condensed consolidated financial statements.
Equity-Based Compensation	Equity-Based Compensation The Company accounts for grants of equity-based awards, including restricted stock units (“RSUs”), at fair value as of the grant date. Each RSU represents the right to receive payment in the form of one share of Class A common stock or an amount equal to the market value of one share of Class A common stock. Holders of unvested RSUs do not have the right to vote with the underlying shares of Class A common stock, but are entitled to accrue dividend equivalents which are generally paid in cash when such RSUs are delivered. The Company recognizes non-cash compensation expense attributable to these grants on a straight-line basis over the requisite service period, which is generally the vesting period. Expenses related to grants of equity-based awards are recorded within employee compensation and benefits in the Condensed Consolidated Statements of Income and are recorded within additional paid-in capital in the Condensed Consolidated Statements of Financial Condition . The fair value of RSUs is determined by the closing stock price on the grant date. Awards the Company intends to settle in cash are classified as liabilities within employee related obligations in the Condensed Consolidated Statements of Financial Condition and are subsequently remeasured to the closing stock price as of each reporting date through the payment date with the changes in value recorded within employee compensation and benefits in the Condensed Consolidated Statements of Income . Forfeitures of equity-based awards are recognized as they occur. See Note 12 , for additional information regarding the Company’s equity-based compensation.
Recently Issued Accounting Standards	Recently Issued Accounting Standards In January 2021, the FASB issued Accounting Standards Updated (“ASU”) 2021-01, Reference Rate Reform (Topic 848) and in March 2020, the FASB issued ASU 2020-04, Reference Rate Reform (Topic 848) . The amendments in these updates provide optional guidance for a limited amount of time to ease the burden on companies in accounting for reference rate reform. The amendments also clarify that the optional expedients and exceptions apply to derivatives that are being implemented as part of the market-wide transition to new reference rates. The method of adoption varies for the updates included in the ASUs. The Company is currently evaluating the impact on its consolidated financial statements upon adoption of the reference rate reform standards. In December 2019, the FASB issued ASU 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes , which modifies ASC 740 to simplify the accounting for income taxes. The guidance, among other changes, (i) provides a policy election to not allocate consolidated income taxes when a member of a consolidated tax return is not subject to income tax and (ii) provides guidance to evaluate whether a step-up in tax basis of goodwill relates to a business combination in which book goodwill was recognized or a separate transaction. The amendments in this ASU are effective for public business entities for fiscal years beginning after December 15, 2020. For all other entities, the amendments are effective for fiscal years beginning after December 15, 2021, and interim periods within fiscal years beginning after December 15, 2022. Early adoption of the amendments is permitted, including adoption in any interim period for (1) public business entities for periods for which financial statements have not yet been issued and (2) all other entities for periods for which financial statements have not yet been made available for issuance. The Company will defer adoption until the guidance is effective for non-public entities, as the Company currently qualifies as an EGC and has elected to take advantage of the extended transition period afforded to EGCs as it applies to the adoption of new accounting standards. The amendments related to changes in ownership of foreign equity method investments or foreign subsidiaries should be applied on a modified retrospective basis through a cumulative-effect adjustment to retained earnings as of the beginning of the fiscal year of adoption. The amendments related to franchise taxes that are partially based on income should be applied on either a retrospective basis for all periods presented or a modified retrospective basis through a cumulative-effect adjustment to retained earnings as of the beginning of the fiscal year of adoption. All other amendments should be applied on a prospective basis. The Company is currently evaluating the impact on its consolidated financial statements upon adoption of this standard. In October 2018, the FASB issued ASU 2018-17, Consolidation (Topic 810): Targeted Improvements to Related Party Guidance for Variable Interest Entities , which reduces the cost and complexity of financial reporting associated with consolidation of VIEs. The amendment provides that indirect interests held through related parties in common control arrangements should be considered on a proportional basis for determining whether fees paid to decision makers and service providers are variable interests. The amendments in this ASU are effective for public business entities with fiscal years beginning after December 15, 2019 and interim periods within those reporting periods, and effective for non-public entities with fiscal years beginning after December 15, 2020 and interim periods within fiscal years beginning after December 15, 2021, with early adoption permitted. The Company will defer adoption until the guidance is effective for non-public entities, as the Company currently qualifies as an EGC and has elected to take advantage of the extended transition period afforded to EGCs as it applies to the adoption of new accounting standards. The guidance should be applied prospectively. The Company has concluded this guidance will not have a material impact on its consolidated financial statements. In January 2017, the FASB issued ASU 2017-04, Intangibles — Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment . Currently, the standard requires an entity to perform a two-step test to determine the amount, if any, of goodwill impairment. In Step 1, an entity compares the fair value of a reporting unit with its carrying amount, including goodwill. If the carrying amount of the reporting unit exceeds its fair value, the entity performs Step 2 and compares the implied fair value of goodwill with the carrying amount of that goodwill for that reporting unit. An impairment charge equal to the amount by which the carrying amount of goodwill for the reporting unit exceeds the implied fair value of that goodwill is recorded, limited to the amount of goodwill allocated to that reporting unit. The new guidance removes Step 2. An entity will apply a one-step quantitative test and record the amount of goodwill impairment as the excess of a reporting unit’s carrying amount over its fair value, not to exceed the total amount of goodwill allocated to the reporting unit. The new guidance does not amend the optional qualitative assessment of goodwill impairment. An entity will apply the new guidance on a prospective basis. The amendments in this ASU are effective for public business entities that are a U.S. Securities and Exchange Commission (“SEC”) filer, excluding entities eligible to be smaller reporting companies as defined by the SEC, with fiscal years beginning after December 15, 2019. All other entities should adopt the amendments in this ASU in fiscal years beginning after December 15, 2022. Early adoption is permitted for annual goodwill impairment tests performed on testing dates after January 1, 2017. The Company early adopted this standard on April 1, 2021 under a prospective approach. The adoption did not have a material impact on the Company’s consolidated financial statements. In June 2016, the FASB issued ASU 2016-13, Financial Instruments — Credit Losses (Topic 326) Measurement of Credit Losses on Financial Instruments . ASU 2016-13 requires an entity to utilize a new impairment model known as the current expected credit loss (“CECL”) model to estimate its lifetime “expected credit loss” and record an allowance that, when deducted from the amortized cost basis of the financial asset, presents the net amount expected to be collected on the financial asset. The CECL model is expected to result in more timely recognition of credit losses. ASU 2016-13 also requires new disclosures for financial assets measured at amortized cost, loans and available-for-sale debt securities. This guidance is for public business entities that are an SEC filer, excluding entities eligible to be smaller reporting companies as defined by the SEC, with fiscal years beginning after December 15, 2019. On March 9, 2020, the FASB extended the adoption date for all other entities to annual periods beginning after December 15, 2022, including interim periods within those fiscal years, with early adoption permitted. The Company is still evaluating this guidance but currently expects that adoption will not have a material impact on its consolidated financial statements. In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842)

Revenue (Tables)

Revenue (Tables)	3 Months Ended
	Mar. 31, 2021
Revenue from Contract with Customer [Abstract]
Summary of Disaggregation of Revenue	For the three months ended March 31, 2021 and 2020, revenues consisted of the following: Three Months Ended March 31, Management fees 2021 2020 Management fees, net $ 80,265 $ 75,727 Fund expense reimbursement revenue 2,360 1,974 Management fees $ 82,625 $ 77,701 Three Months Ended March 31, Incentive fees 2021 2020 Performance fees $ 6,113 $ 605 Carried interest 12,101 2,628 Total incentive fees $ 18,214 $ 3,233

Investments (Tables)

Investments (Tables)	3 Months Ended
	Mar. 31, 2021
Equity Method Investments and Joint Ventures [Abstract]
Schedule of Components of Investments	Investments consist of the following: As of March 31, 2021 December 31, 2020 Equity method investments $ 179,529 $ 165,095 Other investments 1,179 1,178 Total investments $ 180,708 $ 166,273

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2021
Fair Value Disclosures [Abstract]
Schedule of Assets and Liabilities, Measured at Fair Value	The following table summarizes the Company’s assets and liabilities measured at fair value on a recurring basis and level of inputs used for such measurements as of March 31, 2021 and December 31, 2020: Fair Value of Assets (Liabilities) as of March 31, 2021 Level 1 Level 2 Level 3 Total Money market funds $ 109,054 $ — $ — $ 109,054 Interest rate derivatives — 2,930 — 2,930 Public warrants (21,621) — — (21,621) Private warrants — — (4,428) (4,428) Total $ 87,433 $ 2,930 $ (4,428) $ 85,935 Fair Value of Assets (Liabilities) as of December 31, 2020 Level 1 Level 2 Level 3 Total Money market funds $ 149,553 $ — $ — $ 149,553 Interest rate derivatives — (28,442) — (28,442) Public warrants (36,421) — — (36,421) Private warrants — — (6,372) (6,372) Total $ 113,132 $ (28,442) $ (6,372) $ 78,318 Money market funds are valued using quoted market prices and are included in cash and cash equivalents in the Condensed Consolidated Statements of Financial Condition.
Fair Value Measurement Inputs and Valuation Techniques	The significant unobservable inputs into the Valuation Model for the private warrants are as follows: March 31, 2021 December 31, 2020 Risk-free interest rate 0.81 % 0.35 % Expected term (years) 4.6 4.9 Expected volatility 19 % 16 %
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation	The following table presents changes in Level 3 liabilities measured at fair value for the three months ended March 31, 2021: Three Months Ended March 31, 2021 Balance at beginning of period $ (6,372) Change in fair value 1,944 Balance at end of period $ (4,428)

Equity (Tables)

Equity (Tables)	3 Months Ended
	Mar. 31, 2021
Equity [Abstract]
Schedule of Stock by Class	The following table shows a rollforward of the common stock outstanding since December 31, 2020: Class A common stock Class B common stock Class C common stock December 31, 2020 40,835,093 — 144,235,246 Exercise of warrants 1,793,903 — — March 31, 2021 42,628,996 — 144,235,246

Variable Interest Entities (Tab

Variable Interest Entities (Tables)	3 Months Ended
	Mar. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Maximum Exposure to Loss Relating to Non-consolidated VIEs	The following table sets forth certain information regarding the VIEs in which the Company holds a variable interest but does not consolidate. The assets recognized on the Company’s Condensed Consolidated Statements of Financial Condition related to the Company’s interests in and management, incentive fees and third party costs receivables from these non-consolidated VIEs and the Company’s maximum exposure to loss relating to non-consolidated VIEs as of March 31, 2021 and December 31, 2020 were as follows: As of March 31, 2021 December 31, 2020 Investments $ 79,472 $ 77,511 Receivables 13,892 14,322 Maximum exposure to loss $ 93,364 $ 91,833

Employee Compensation and Ben_2

Employee Compensation and Benefits (Tables)	3 Months Ended
	Mar. 31, 2021
Compensation Related Costs [Abstract]
Schedule of Employee Compensation and Benefits	For the three months ended March 31, 2021 and 2020, employee compensation and benefits consisted of the following: Three Months Ended March 31, 2021 2020 Cash-based employee compensation and benefits $ 41,780 $ 44,302 Equity-based compensation 27,036 — Partnership interest-based compensation 4,903 7,920 Carried interest compensation 6,860 2,190 Cash-based incentive fee related compensation 1,833 — Other 941 1,065 Total employee compensation and benefits $ 83,353 $ 55,477

Equity-Based Compensation (Tabl

Equity-Based Compensation (Tables)	3 Months Ended
	Mar. 31, 2021
Equity [Abstract]
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity	A summary of RSU activity for the three months ended March 31, 2021 is as follows: Number of RSUs Weighted-Average Grant-Date Fair Value Per RSUs Balance as of December 31, 2020 — $ — Granted 4,759,375 13.04 Vested (1,952,685) 13.04 Forfeited — — Balance as of March 31, 2021 2,806,690 $ 13.04

Debt (Tables)

Debt (Tables)	3 Months Ended
	Mar. 31, 2021
Debt Disclosure [Abstract]
Schedule of Outstanding Debt Balance	The table below summarizes the outstanding debt balance as of March 31, 2021 and December 31, 2020. As of March 31, 2021 December 31, 2020 Senior loan $ 290,000 $ 340,259 Less debt issuance costs (5,018) (5,104) Total debt $ 284,982 $ 335,155
Schedule of Maturities of Long-term Debt	Maturities of debt for the next five years and thereafter are as follows: Year Ending December 31, Remainder of 2021 $ 2,175 2022 2,900 2023 2,900 2024 2,900 2025 2,900 Thereafter 276,225 Total $ 290,000

Interest Rate Derivatives (Tabl

Interest Rate Derivatives (Tables)	3 Months Ended
	Mar. 31, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Interest Rate Derivatives Recorded as Derivative Liability	The Company had the following interest rate derivatives recorded as an asset within other assets in the Condensed Consolidated Statements of Financial Condition as of March 31, 2021 and as a liability within accrued expenses and other liabilities in the Condensed Consolidated Statements of Financial Condition as of December 31, 2020: As of March 31, 2021 Derivative Notional Amount Fair Value as of March 31, 2021 Fixed Rate Paid Floating Rate Received Effective Date (2) Maturity Date Interest rate swap $ 232,000 $ 2,930 1.33 % 1 month LIBOR (1) March 2021 February 2028 ____________ (1) Floating rate received subject to a 0.50% Floor (2) Represents the date at which the derivative is in effect and the Company is contractually required to begin payment of interest under the terms of the agreement. As of December 31, 2020 Derivative Notional Amount Fair Value as of December 31, 2020 Fixed Rate Paid Floating Rate Received Effective Date (3) Maturity Date Interest rate swap $ 225,000 $ (11,163) 2.48 % 1 month LIBOR (1) January 2020 February 2023 Interest rate swap 75,000 (4,654) 3.05 % 1 month LIBOR (1) January 2020 February 2023 Interest rate collar 300,000 (12,625) 3.70 % 1 month LIBOR (2) February 2023 February 2025 $ (28,442) ____________ (1) Floating rate received subject to a 0.00% Floor (2) Floating rate received subject to a 2.45% Floor (3) Represents the date at which the derivative is in effect and the Company is contractually required to begin payment of interest under the terms of the agreement.
Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss)	A rollforward of the amounts in accumulated other comprehensive income (loss) (“AOCI”) related to interest rate derivatives designated as cash flow hedges as follows: Three Months Ended March 31, 2021 2020 Unrealized loss at beginning of period, gross $ (11,163) $ (6,933) Cumulative-effect adjustment from adoption of ASU 2017-12 — 650 Amount of recognized in other comprehensive income (loss) 2,559 (7,723) Amount reclassified from accumulated other comprehensive loss to interest expense 1,120 446 Unrealized loss at end of period (7,484) (13,560) Less: Loss attributable to noncontrolling interests in GCMH (5,894) — Unrealized loss at end of period, net $ (1,590) $ (13,560)
Derivative Instruments, Gain (Loss)	The amount of gain (loss) related to interest rate contracts not designated as hedging instruments was recognized as follows: Three Months Ended March 31, 2021 2020 Other income (expense) $ 1,934 $ (8,634)

Earnings (Loss) Per Share (Tabl

Earnings (Loss) Per Share (Tables)	3 Months Ended
	Mar. 31, 2021
Earnings Per Share [Abstract]
Schedule of Reconciliation of Basic and Diluted Earnings (Loss) Per Share	The following is a reconciliation of basic and diluted earnings (loss) per share from continuing operations for the three months ended March 31, 2021: Three Months Ended March 31, 2021 Numerator for earnings (loss) per share calculation: Net income attributable to GCM Grosvenor Inc. $ 2,547 Exercise of private warrants (431) Exercise of public warrants (2,787) Exchange of Partnership units (9,479) Net loss attributable to common stockholders, diluted (10,150) Denominator for earnings (loss) per share calculation: Weighted-average shares, basic 42,084,366 Exercise of private warrants - incremental shares under the treasury stock method 307,858 Exercise of public warrants - incremental shares under the treasury stock method 2,244,583 Exchange of Partnership units 144,235,246 Weighted-average shares, diluted 188,872,053 Basic EPS Net income attributable to common stockholders, basic $ 2,547 Weighted-average shares, basic 42,084,366 Net income per share attributable to common stockholders, basic $ 0.06 Diluted EPS Net loss attributable to common stockholders, diluted $ (10,150) Weighted-average shares, diluted 188,872,053 Net loss per share attributable to common stockholders, diluted $ (0.05)
Schedule of Outstanding Potentially Dilutive Securities Excluded from Calculation of Diluted Earnings (Loss) Per Share	The following outstanding potentially dilutive securities were excluded from the calculation of diluted earnings (loss) per share attributable to common stockholders because their impact would have been antidilutive for the period presented: As of March 31, 2021 Unvested restricted stock units 2,806,690

Organization (Details)

Organization (Details)	Mar. 31, 2021	Dec. 31, 2020
GCMH
Finite-Lived Intangible Assets [Line Items]
Ownership percentage by parent	22.80%	22.10%

Mosaic Transaction (Details)

Mosaic Transaction (Details)	Jan. 01, 2020USD ($)	Mar. 31, 2021USD ($)	Mar. 31, 2020USD ($)	Dec. 31, 2020USD ($)	Dec. 31, 2022USD ($)	Dec. 31, 2021USD ($)
Variable Interest Entity [Line Items]
Proceeds from noncontrolling interests transferred	$ 125,400,000	$ 1,083,000	$ 174,564,000
Proceeds received to fund future investment commitments	48,000,000	25,000,000		$ 32,100,000
Maximum potential payment	$ 19,900,000
Potential payments				4,900,000
Total assets		534,843,000		632,278,000
Total liabilities		454,587,000		599,347,000
Forecast
Variable Interest Entity [Line Items]
Potential payments					$ 7,500,000	$ 7,500,000
Call Right
Variable Interest Entity [Line Items]
Payments for call right		2,600,000
Purchase price ratio	1.3
Internal rate of return, percentage	12.00%
Put Option | Mosaic Counterparty
Variable Interest Entity [Line Items]
Purchase price ratio	1.3
Internal rate of return, percentage	12.00%
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Total assets		96,500,000		101,400,000
Total liabilities		$ 0		$ 0

Revenue - Disaggregation of Rev

Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Revenue	$ 103,219	$ 82,617
Management fees, net
Disaggregation of Revenue [Line Items]
Revenue	80,265	75,727
Fund expense reimbursement revenue
Disaggregation of Revenue [Line Items]
Revenue	2,360	1,974
Management fees
Disaggregation of Revenue [Line Items]
Revenue	82,625	77,701
Performance fees
Disaggregation of Revenue [Line Items]
Revenue	6,113	605
Carried interest
Disaggregation of Revenue [Line Items]
Revenue	12,101	2,628
Total incentive fees
Disaggregation of Revenue [Line Items]
Revenue	$ 18,214	$ 3,233

Revenue - Additional Informatio

Revenue - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenue from Contract with Customer [Abstract]
Revenue recognized	$ 1	$ 0.4

Investments - Components of Inv

Investments - Components of Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Equity Method Investments and Joint Ventures [Abstract]
Equity method investments	$ 179,529	$ 165,095
Other investments	1,179	1,178
Total investments	$ 180,708	$ 166,273

Investments - Additional Inform

Investments - Additional Information (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Total investments	$ 180,708	$ 166,273
Noncontrolling Interests
Schedule of Equity Method Investments [Line Items]
Total investments	$ 175,700	$ 161,900

Fair Value Measurements - Asset

Fair Value Measurements - Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	$ 109,054	$ 149,553
Interest rate derivatives	2,930
Interest rate derivatives		(28,442)
Warrants	(26,049)	(42,793)
Total	85,935	78,318
Public Warrants
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrants	(21,621)	(36,421)
Private Warrants
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrants	(4,428)	(6,372)
Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	109,054	149,553
Interest rate derivatives	0
Interest rate derivatives		0
Total	87,433	113,132
Fair Value, Inputs, Level 1 | Public Warrants
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrants	(21,621)	(36,421)
Fair Value, Inputs, Level 1 | Private Warrants
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrants	0	0
Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	0	0
Interest rate derivatives	2,930
Interest rate derivatives		(28,442)
Total	2,930	(28,442)
Fair Value, Inputs, Level 2 | Public Warrants
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrants	0	0
Fair Value, Inputs, Level 2 | Private Warrants
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrants	0	0
Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	0	0
Interest rate derivatives	0
Interest rate derivatives		0
Total	(4,428)	(6,372)
Fair Value, Inputs, Level 3 | Public Warrants
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrants	0	0
Fair Value, Inputs, Level 3 | Private Warrants
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrants	$ (4,428)	$ (6,372)

Fair Value Measurements - Measu

Fair Value Measurements - Measurement Inputs (Details)	Mar. 31, 2021	Dec. 31, 2020	Nov. 17, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrants term			5 years
Fair Value, Inputs, Level 3 | Measurement Input, Risk Free Interest Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement input	0.0081	0.0035
Fair Value, Inputs, Level 3 | Measurement Input, Expected Term
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrants term	4 years 7 months 6 days	4 years 10 months 24 days
Fair Value, Inputs, Level 3 | Measurement Input, Price Volatility
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement input	0.19	0.16

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Nov. 17, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrants term			5 years
Warrant liabilities	$ 26,049	$ 42,793
Private Warrants
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value (in dollars per warrant)	$ 1.64	$ 2.36
Warrant liabilities	$ 4,428	$ 6,372

Fair Value Measurements (as res

Fair Value Measurements (as restated) - Level 3 Roll Forward (Details) - Fair Value, Inputs, Level 3 $ in Thousands	3 Months Ended
	Mar. 31, 2021USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	$ (6,372)
Change in fair value	1,944
Balance at end of period	$ (4,428)

Equity - Schedule of Common Sto

Equity - Schedule of Common Stock Outstanding (Details)	3 Months Ended
	Mar. 31, 2021shares
Common Class A
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock outstanding, beginning balance (in shares)	40,835,093
Common stock outstanding, ending balance (in shares)	42,628,996
Common Class A | Public Warrants
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of warrants (in shares)	1,793,903
Common Class B
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock outstanding, beginning balance (in shares)	0
Common stock outstanding, ending balance (in shares)	0
Common Class B | Public Warrants
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of warrants (in shares)	0
Common Class C
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock outstanding, beginning balance (in shares)	144,235,246
Common stock outstanding, ending balance (in shares)	144,235,246
Common Class C | Public Warrants
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of warrants (in shares)	0

Equity - Additional Information

Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	Mar. 15, 2021	Feb. 25, 2021	Mar. 31, 2021
Class of Stock [Line Items]
Dividends accrued			$ 6,548
Restricted Stock Units (RSUs)
Class of Stock [Line Items]
Dividends accrued			$ 700
Common Class A
Class of Stock [Line Items]
Common stock, dividends declared (in dollars per share)		$ 0.08
Dividends paid (per share)	$ 0.06

Warrants (Details)

Warrants (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Class of Warrant or Right [Line Items]
Proceeds from exercise of warrants	$ 24,465	$ 0
Public Warrants
Class of Warrant or Right [Line Items]
Warrants outstanding (in shares)	18,479,664		20,273,567
Proceeds from exercise of warrants	$ 20,600
Public Warrants | Common Class A
Class of Warrant or Right [Line Items]
Exercise of warrants (in shares)	1,793,903
Private Placement Warrants
Class of Warrant or Right [Line Items]
Warrants outstanding (in shares)	2,700,000		2,700,000

Variable Interest Entities - Ad

Variable Interest Entities - Additional Information (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Investments	$ 79,472	$ 77,511
Variable Interest Entity, Not Primary Beneficiary | Noncontrolling Interests
Variable Interest Entity [Line Items]
Investments	79,400	77,400
Unfunded Commitments
Variable Interest Entity [Line Items]
Commitment amount	81,600	81,800
Unfunded Commitments | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Commitment amount	$ 26,600	$ 32,800

Variable Interest Entities - Sc

Variable Interest Entities - Schedule of VIEs (Details) - Variable Interest Entity, Not Primary Beneficiary - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Variable Interest Entity [Line Items]
Investments	$ 79,472	$ 77,511
Receivables	13,892	14,322
Maximum exposure to loss	$ 93,364	$ 91,833

Employee Compensation and Ben_3

Employee Compensation and Benefits - Employee Compensation and Benefits (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Compensation Related Costs [Abstract]
Cash-based employee compensation and benefits	$ 41,780	$ 44,302
Equity-based compensation	27,036	0
Partnership interest-based compensation	4,903	7,920
Carried interest compensation	6,860	2,190
Cash-based incentive fee related compensation	1,833	0
Other	941	1,065
Total employee compensation and benefits	$ 83,353	$ 55,477

Employee Compensation and Ben_4

Employee Compensation and Benefits - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Compensation Related Costs [Abstract]
Partnership interest-based compensation	$ 4,903	$ 7,920
Interest-based compensation, award modifications	1,600	3,700
Unvested stated target payments	10,900	9,200
Interest-based compensation expense, profit interest	$ 3,300	$ 4,200

Equity-Based Compensation - Add

Equity-Based Compensation - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation	$ 27,036	$ 0
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSUs granted (in shares)	4,759,375
Aggregate grant date fair value	$ 62,100
Vested in period (in shares)	1,952,685
Nonvested awards (in shares)	2,806,690			0
Award vesting period	2 years
Vested in period, fair value	$ 25,500
Equity-based compensation	27,000
Cost not yet recognized	$ 35,100
Period for recognition	1 year 10 months 24 days
Restricted Stock Units (RSUs) | Forecast
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSUs, settled in cash (in shares)			100,000

Equity-Based Compensation - Sum

Equity-Based Compensation - Summary of RSU Activity (Details) - Restricted Stock Units (RSUs) - $ / shares	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Number of RSUs
Beginning balance (in shares)	0
RSUs granted (in shares)	4,759,375
Vested in period (in shares)	(1,952,685)
Forfeited (in shares)	0
Ending balance (in shares)	2,806,690
Weighted-Average Grant-Date Fair Value Per RSUs
Nonvested (in dollars per share)	$ 13.04	$ 0
Granted (in dollars per share)	13.04
Vested (in dollars per share)	13.04
Forfeited (in dollars per share)	$ 0

Debt - Schedule of Debt Outstan

Debt - Schedule of Debt Outstanding (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Long-term debt, gross	$ 290,000
Less debt issuance costs	(5,018)	$ (5,104)
Total debt	284,982	335,155
Senior Loan
Debt Instrument [Line Items]
Long-term debt, gross	290,000	$ 340,259
Less debt issuance costs	$ (900)

Debt - Maturities of Debt (Deta

Debt - Maturities of Debt (Details) $ in Thousands	Mar. 31, 2021USD ($)
Debt Disclosure [Abstract]
Remainder of 2021	$ 2,175
2022	2,900
2023	2,900
2024	2,900
2025	2,900
Thereafter	276,225
Total	$ 290,000

Debt - Additional Information (

Debt - Additional Information (Details)	Feb. 24, 2021USD ($)	Mar. 31, 2021USD ($)	Mar. 31, 2020USD ($)	Dec. 31, 2020USD ($)	Jan. 02, 2014USD ($)
Debt Instrument [Line Items]
Principal payments on senior loan		$ 50,259,000	$ 91,195,000
Debt issuance costs, net		5,018,000		$ 5,104,000
Amortization of debt issuance costs		261,000	$ 855,000
Long-term debt, gross		290,000,000
Senior Loan
Debt Instrument [Line Items]
Principal payments on senior loan		50,300,000
Accelerated debt issuance expense		700,000
Debt issuance costs, net		900,000
Amortization of debt issuance costs		$ 2,600,000
Prepayment deadline following quarterly financial statement if leverage ratio exceeds 2.50		5 days
Maximum leverage ratio		2.50
Long-term debt, gross		$ 290,000,000		340,259,000
Senior Loan | 2028 Term Loans
Debt Instrument [Line Items]
Face amount	$ 290,000,000
Periodic principal payment	$ 725,000
Long-term debt, gross		$ 290,000,000
Weighted average interest rate		3.81%
Senior Loan | 2028 Term Loans | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate	2.50%
Debt, LIBOR floor	0.50%
Senior Loan | 2025 Term Loans
Debt Instrument [Line Items]
Long-term debt, gross				$ 340,300,000
Weighted average interest rate				3.98%
Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity					$ 50,000,000
Line of credit outstanding		$ 0		$ 0

Interest Rate Derivatives - Sch

Interest Rate Derivatives - Schedule of Derivative Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Derivative [Line Items]
Fair Value	$ 2,930
Fair Value		$ (28,442)
Interest Rate Swap, 1.33%
Derivative [Line Items]
Notional Amount	232,000
Fair Value	$ 2,930
Fixed Rate Paid	1.33%
Derivative, LIBOR floor	0.50%
Interest Rate Swap, 2.48% and 3.05%
Derivative [Line Items]
Derivative, LIBOR floor		0.00%
Interest Rate Swap, 2.48%
Derivative [Line Items]
Notional Amount		$ 225,000
Fair Value		$ (11,163)
Fixed Rate Paid		2.48%
Interest Rate Swap, 3.05%
Derivative [Line Items]
Notional Amount		$ 75,000
Fair Value		$ (4,654)
Fixed Rate Paid		3.05%
Interest Rate Collar
Derivative [Line Items]
Notional Amount		$ 300,000
Fair Value		$ (12,625)
Fixed Rate Paid		3.70%
Derivative, LIBOR floor		2.45%

Interest Rate Derivatives - Eff

Interest Rate Derivatives - Effect on Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Derivative [Roll Forward]
Beginning balance	$ (82,190)
Ending balance	(37,204)
Total GCM Grosvenor Inc. deficit	(21,465)		$ (29,342)
Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest
Derivative [Roll Forward]
Beginning balance	(11,163)	$ (6,933)
Amount of recognized in other comprehensive income (loss)	2,559	(7,723)
Amount reclassified from accumulated other comprehensive loss to interest expense	1,120	446
Ending balance	(7,484)	(13,560)
Less: Loss attributable to noncontrolling interests in GCMH	(5,894)	0
Total GCM Grosvenor Inc. deficit	(1,590)	(13,560)
Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest | Cumulative Effect, Period of Adoption, Adjustment
Derivative [Roll Forward]
Beginning balance	$ 0	$ 650

Interest Rate Derivatives - Gai

Interest Rate Derivatives - Gain (Loss) Recognized in Earnings (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Interest Rate Contract | Other income (expense)
Derivative [Line Items]
Derivative instruments gain (loss), net	$ 1,934	$ (8,634)

Interest Rate Derivatives - Add

Interest Rate Derivatives - Additional Information (Details) - Interest Rate Swap, 1.33% $ in Thousands	Mar. 31, 2021USD ($)
Derivative [Line Items]
Notional Amount	$ 232,000
Derivative, LIBOR floor	0.50%

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Thousands	Mar. 11, 2021	Mar. 10, 2021	Jan. 01, 2020	Aug. 31, 2019	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Loss Contingencies [Line Items]
Consideration received from assignment to partner					$ 1,337	$ 0
Proceeds received to fund future investment commitments			$ 48,000		25,000		$ 32,100
Fixed Management Fee
Loss Contingencies [Line Items]
Annual management fee		$ 500			300
Management fee duration		5 years
Unfunded Commitments
Loss Contingencies [Line Items]
Commitment amount					$ 81,600		$ 81,800
Air Transportation Equipment
Loss Contingencies [Line Items]
Percent of asset acquired		12.50%
Air Transportation Equipment | GCMH
Loss Contingencies [Line Items]
Percent of asset ownership assigned to partner	50.00%
Percent of asset ownership interest				12.50%
Consideration received from assignment to partner	$ 1,300

Related Parties (Details)

Related Parties (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Related Party Transaction [Line Items]
Net receivables from related parties	$ 8.4		$ 11.2
Management
Related Party Transaction [Line Items]
Investment balance of related party	442		$ 426.7
Affiliated Entity | Aircraft Utilization | GCMH
Related Party Transaction [Line Items]
Amounts of transaction	$ 0.2	$ 0.9

Income Taxes - Additional Infor

Income Taxes - Additional Information (Details)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Tax Disclosure [Abstract]
Effective income tax rate	(3.00%)	(7.00%)

Earnings (Loss) Per Share - Rec

Earnings (Loss) Per Share - Reconciliation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Numerator for earnings (loss) per share calculation:
Net income attributable to GCM Grosvenor Inc.		$ 2,547	$ 0
Exchange of Partnership units		(9,479)
Net loss attributable to common stockholders, diluted		$ (10,150)
Denominator for earnings (loss) per share calculation:
Weighted-average shares, basic (in shares)	[1]	42,084,366	0
Exchange of Partnership Units (in shares)		144,235,246
Diluted (in shares)	[1]	188,872,053	0
Basic EPS
Net income attributable to common stockholders, basic		$ 2,547
Weighted-average shares, basic (in shares)	[1]	42,084,366	0
Net income per share attributable to common stockholders, basic (in dollars per share)	[1]	$ 0.06	$ 0
Diluted EPS
Net loss attributable to common stockholders, diluted		$ (10,150)
Weighted-average shares, diluted (in shares)	[1]	188,872,053	0
Net income per share attributable to common stockholders, diluted (in dollars per share)	[1]	$ (0.05)	$ 0
Private Warrants
Numerator for earnings (loss) per share calculation:
Exercise of warrants		$ (431)
Denominator for earnings (loss) per share calculation:
Exercise of warrants - incremental shares under the treasury stock method (in shares)		307,858
Public Warrants
Numerator for earnings (loss) per share calculation:
Exercise of warrants		$ (2,787)
Denominator for earnings (loss) per share calculation:
Exercise of warrants - incremental shares under the treasury stock method (in shares)		2,244,583
[1]	There were no shares of Class A common stock outstanding prior to November 17, 2020, therefore no earnings (loss) per share information has been presented for any period prior to that date.

Earnings (Loss) Per Share - Pot

Earnings (Loss) Per Share - Potentially Dilutive Securities Excluded from Calculation of EPS (Details)	3 Months Ended
	Mar. 31, 2021shares
Restricted Stock Units (RSUs)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of EPS (in shares)	2,806,690

Uncategorized Items - gcm-20210

Label	Element	Value
Dividends Payable	us-gaap_DividendsPayableCurrentAndNoncurrent	$ 0
Accounting Standards Update [Extensible List]	us-gaap_AccountingStandardsUpdateExtensibleList	us-gaap:AccountingStandardsUpdate201409Member