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v3.21.2

Organization and Basis of Presentation - Additional Information (Detail) - USD ($) $ in Thousands | Jul. 30, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Jan. 01, 2019
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Operating lease ROU assets |  | $ 134,342 |  | $ 165,969 |  |  |  |  |
Operating lease liabilities |  | 163,887 |  | 190,207 |  |  |  |  |
Assets |  | (5,415,607) |  | (3,953,242) |  |  |  |  |
Noncontrolling interest in subsidiaries |  | (685,165) | $ (794,360) | (811,297) | $ (773,245) | $ (748,953) |  | $ (729,106) |
Retained deficit |  | 1,244,718 |  | 1,280,828 |  |  |  |  |
Futures Exchange Group |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Payments to acquire businesses | $ 4,900 |  |  |  |  |  |  |  |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Operating lease ROU assets |  |  |  |  |  |  |  |  | $ 192,400
Operating lease liabilities |  |  |  |  |  |  |  |  | $ 206,000
Noncontrolling interest in subsidiaries |  |  |  |  |  |  |  | 1,300 |
Assets | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  | $ 1,900 |  |
Tax effect impact for increase or decrease to the liability |  |  |  |  |  |  | 600 |  |
Noncontrolling Interest in Subsidiaries |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Noncontrolling interest in subsidiaries |  | (54,261) | (64,028) | (57,061) | (58,536) | (55,849) |  | (48,976) |
Noncontrolling Interest in Subsidiaries | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Noncontrolling interest in subsidiaries |  |  |  |  |  |  | 600 | 417 |
Tax effect impact for increase or decrease to the liability |  |  |  |  |  |  | 200 |  |
Retained Deficit |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Noncontrolling interest in subsidiaries |  | $ 1,244,718 | $ 1,229,498 | $ 1,280,828 | $ 1,273,173 | $ 1,278,419 |  | 1,264,567 |
Retained Deficit | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Noncontrolling interest in subsidiaries |  |  |  |  |  |  |  | $ 883 |
Retained deficit |  |  |  |  |  |  | 1,300 |  |
Tax effect impact for increase or decrease to the liability |  |  |  |  |  |  | $ 400 |  |

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