| Document And Entity Information - shares | 2 Months Ended | |
| Sep. 30, 2020 | Nov. 18, 2020 | |
| Document Information Line Items | ||
| Entity Registrant Name | GCM Grosvenor Inc. | |
| Document Type | 10-Q | |
| Current Fiscal Year End Date | --12-31 | |
| Entity Common Stock, Shares Outstanding | 42,259,797 | |
| Amendment Flag | false | |
| Entity Central Index Key | 0001819796 | |
| Entity Current Reporting Status | No | |
| Entity Filer Category | Non-accelerated Filer | |
| Document Period End Date | Sep. 30, 2020 | |
| Document Fiscal Year Focus | 2020 | |
| Document Fiscal Period Focus | Q3 | |
| Entity Small Business | false | |
| Entity Emerging Growth Company | true | |
| Entity Shell Company | false | |
| Entity Ex Transition Period | false | |
| Entity File Number | 001-39716 | |
| Document Transition Report | false | |
| Entity Incorporation, State or Country Code | DE | |
| Entity Interactive Data Current | Yes |
| Balance Sheets - USD ($) | Sep. 30, 2020 | Jul. 28, 2020 |
| Assets | ||
| Total assets | ||
| Liabilities and Stockholder’s Equity | ||
| Total liabilities | ||
| Stockholder’s equity: | ||
| Ordinary shares, $0.0001 par value, 100 shares issued and outstanding | 0.01 | 0.01 |
| Due from stockholder | (0.01) | (0.01) |
| Total stockholder’s equity | ||
| Total liabilities and stockholder’s equity |
| Balance Sheets (Parentheticals) - $ / shares | Sep. 30, 2020 | Jul. 28, 2020 |
| Statement of Financial Position [Abstract] | ||
| Common stock, par value (in Dollars per share) | $ 0.0001 | $ 0.0001 |
| Common stock, shares issued | 100 | 100 |
| Common stock, shares outstanding | 100 | 100 |
| Background and Nature of Operations | 2 Months Ended |
| Sep. 30, 2020 | |
| Organization Consolidation And Presentation Of Financial Statements [Abstract] | |
| Background and Nature of Operations | Note 1: Background and Nature of Operations GCM Grosvenor Inc. (the “Company”) was incorporated in Delaware on July 27, 2020 as a wholly owned subsidiary of Grosvenor Capital Management Holdings, LLLP (the “Partnership” or “GCMH”). The Company was formed for the purpose of completing the transactions contemplated by the definitive transaction agreement, dated August 2, 2020 (the “Transaction Agreement”), by and among CF Finance Acquisition Corp. (“CFAC”), the Partnership, CF Finance Intermediate Acquisition, LLC (“IntermediateCo”) and the other parties thereto as discussed in Note 4. |
| Summary of Significant Accounting Policies | 2 Months Ended |
| Sep. 30, 2020 | |
| Accounting Policies [Abstract] | |
| Summary of Significant Accounting Policies | Note 2: Summary of Significant Accounting Policies Basis of Presentation The balance sheets are presented in accordance with accounting principles generally accepted in the United States of America (“GAAP”). Separate statements of income and comprehensive income, changes in stockholder’s equity, and cash flows have not been presented because there have been no activities in this entity from July 28, 2020 to September 30, 2020. Use of Estimates The preparation of the financial statement in conformity with GAAP requires the Company’s management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the balance sheet. Actual results could differ from those estimates. Organization costs Costs related to incorporation of the Company will be paid by the Partnership and recorded as an expense of the Partnership. |
| Stockholder's Equity | 2 Months Ended |
| Sep. 30, 2020 | |
| Stockholders' Equity Note [Abstract] | |
| Stockholder’s Equity | Note 3: Stockholder’s Equity The Company’s authorized capital stock consists of 100 shares of common stock, with a par value of $0.0001 per share. On July 27, 2020, the Company issued 100 shares of common stock to the Partnership for aggregate consideration of $0.01. |
| Subsequent Events | 2 Months Ended |
| Sep. 30, 2020 | |
| Subsequent Events [Abstract] | |
| Subsequent Events | Note 4: Subsequent Events On November 17, 2020, as contemplated by the Transaction Agreement, (a) CFAC merged with and into the Company, upon which the separate corporate existence of CFAC ceased and the Company became the surviving entity and each share of CFAC common stock was converted into one share of Class A common stock, and each whole warrant of CFAC was converted into one warrant of the Company and GCMH cancelled its ownership of the 100 shares of common stock of the Company; (b) the Company received $120.4 million remaining in the Trust Account following redemptions made in connection with CFAC’s special meeting of stockholders relating to the transactions contemplated by the Transaction Agreement, (c) certain investors (the “PIPE Investors”) purchased 19,500,000 shares of Class A common stock; (d) the CF Sponsor purchased 3,500,000 shares of Class A common stock and 1,500,000 warrants of the Company for an aggregate price equal to $30,000,000 pursuant to a forward purchase contract; (e) the CF Sponsor terminated, forfeited and cancelled, for no consideration, 2,351,534 shares of Class A common stock and 150,000 warrants of the Company; (f) the Company issued 900,000 warrants to purchase Class A common stock to Holdings; (g) Holdings assigned, and IntermediateCo assumed, all right, title and interest in and to the Option Agreement in exchange for the Option Consideration in the Option Conveyance ; (h) immediately following the Option Conveyance, IntermediateCo consummated the exercise of certain options (pursuant to the Option Agreement) to purchase all of the Class B-2 common units of GCMH then held by certain investors (pursuant to the Option Agreement); (i)(x) GCMHGP LLC sold all of the outstanding equity interests of GCMH then held by it, including the general partnership and limited partnership interests, to IntermediateCo for the GCMH Consideration and (y) Holdings sold all of the outstanding equity interests of GCM LLC to IntermediateCo for the GCM Consideration; (j) GCMH was redomiciled as a limited liability limited partnership in the State of Delaware and its Limited Liability Limited Partnership Agreement was amended and restated; (k) GCMH issued to IntermediateCo the GCM PubCo Matching Grosvenor common units and the GCM PubCo Matching Grosvenor warrants, in each case in exchange for the IntermediateCo Contribution Amount in the IntermediateCo Contribution and Issuance ; and (l) the Company issued 144,235,246 shares of Class C common stock to GCM V (the transactions referred to in clauses (a) through (l), collectively, the “Transactions”). Following the consummation of the Transactions, the Company owns all of the equity interests in IntermediateCo, which acts as the general partner of the Partnership (collectively, “GCM Grosvenor”). |
| Accounting Policies, by Policy (Policies) | 2 Months Ended |
| Sep. 30, 2020 | |
| Accounting Policies [Abstract] | |
| Basis of Presentation | Basis of Presentation The balance sheets are presented in accordance with accounting principles generally accepted in the United States of America (“GAAP”). Separate statements of income and comprehensive income, changes in stockholder’s equity, and cash flows have not been presented because there have been no activities in this entity from July 28, 2020 to September 30, 2020. |
| Use of Estimates | Use of Estimates The preparation of the financial statement in conformity with GAAP requires the Company’s management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the balance sheet. Actual results could differ from those estimates. |
| Organization costs | Organization costs Costs related to incorporation of the Company will be paid by the Partnership and recorded as an expense of the Partnership. |
| Stockholder's Equity (Details) - $ / shares | Sep. 30, 2020 | Jul. 28, 2020 | Jul. 27, 2020 |
| Stockholders' Equity Note [Abstract] | |||
| Authorized shares of common stock | 100 | ||
| Common stock par value | $ 0.0001 | $ 0.0001 | $ 0.01 |
| Common stock shares issued | 100 | 100 | 100 |
| Subsequent Events (Details) | 1 Months Ended |
| Nov. 17, 2020 | |
| Subsequent Event [Member] | |
| Subsequent Events (Details) [Line Items] | |
| Subsequent events, description | On November 17, 2020, as contemplated by the Transaction Agreement, (a) CFAC merged with and into the Company, upon which the separate corporate existence of CFAC ceased and the Company became the surviving entity and each share of CFAC common stock was converted into one share of Class A common stock, and each whole warrant of CFAC was converted into one warrant of the Company and GCMH cancelled its ownership of the 100 shares of common stock of the Company; (b) the Company received $120.4 million remaining in the Trust Account following redemptions made in connection with CFAC’s special meeting of stockholders relating to the transactions contemplated by the Transaction Agreement, (c) certain investors (the “PIPE Investors”) purchased 19,500,000 shares of Class A common stock; (d) the CF Sponsor purchased 3,500,000 shares of Class A common stock and 1,500,000 warrants of the Company for an aggregate price equal to $30,000,000 pursuant to a forward purchase contract; (e) the CF Sponsor terminated, forfeited and cancelled, for no consideration, 2,351,534 shares of Class A common stock and 150,000 warrants of the Company; (f) the Company issued 900,000 warrants to purchase Class A common stock to Holdings; (g) Holdings assigned, and IntermediateCo assumed, all right, title and interest in and to the Option Agreement in exchange for the Option Consideration in the Option Conveyance ; (h) immediately following the Option Conveyance, IntermediateCo consummated the exercise of certain options (pursuant to the Option Agreement) to purchase all of the Class B-2 common units of GCMH then held by certain investors (pursuant to the Option Agreement); (i)(x) GCMHGP LLC sold all of the outstanding equity interests of GCMH then held by it, including the general partnership and limited partnership interests, to IntermediateCo for the GCMH Consideration and (y) Holdings sold all of the outstanding equity interests of GCM LLC to IntermediateCo for the GCM Consideration; (j) GCMH was redomiciled as a limited liability limited partnership in the State of Delaware and its Limited Liability Limited Partnership Agreement was amended and restated; (k) GCMH issued to IntermediateCo the GCM PubCo Matching Grosvenor common units and the GCM PubCo Matching Grosvenor warrants, in each case in exchange for the IntermediateCo Contribution Amount in the IntermediateCo Contribution and Issuance ; and (l) the Company issued 144,235,246 shares of Class C common stock to GCM V (the transactions referred to in clauses (a) through (l), collectively, the “Transactions”). |
