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Discontinued Operations - Additional Information (Detail) - USD ($) shares in Millions |  |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Nov. 23, 2018 | Nov. 23, 2018 | Nov. 07, 2018 | Sep. 05, 2018 | Nov. 30, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Mar. 19, 2018
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Net cash provided by (used in) operating activities from discontinued operations |  |  |  |  |  | $ 0 | $ 0 | $ (748,231,000) |
Net cash provided by (used in) investing activities from discontinued operations |  |  |  |  |  | 0 | 0 | 18,347,000 |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Repayments of outstanding borrowings |  |  | $ 150,000,000.0 |  |  |  |  |  |
Intercompany Credit Agreement [Member] |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Line of credit facility, outstanding amount |  |  |  |  |  |  |  |  | $ 150,000,000.0
Cantor [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Line of credit facility, outstanding amount |  |  |  |  |  | $ 0 | $ 0 |  | $ 150,000,000.0
8.125% Senior Notes Due 2042 [Member] |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  | 8.125% |  |  |
Debt maturity year |  |  |  |  |  | 2042 |  |  |
Repayments of outstanding borrowings |  |  |  | $ 112,500,000 |  |  |  |  |
5.375% Senior Notes Due 2019 [Member] |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  | 5.375% |  |  |
5.375% Senior Notes Due 2019 [Member] |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Stated interest rate | 5.375% | 5.375% |  |  |  |  |  |  |
Debt maturity year |  | 2019 |  |  |  | 2019 |  |  |
Repayments of outstanding borrowings | $ 300,000,000.0 |  |  |  |  |  |  |  |
Newmark [Member] | Intercompany Credit Agreement [Member] |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Repayments of outstanding borrowings |  |  | $ 150,000,000.0 |  |  |  |  |  |
Newmark [Member] | 5.375% Senior Notes Due 2019 [Member] |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Repayments of outstanding borrowings |  | $ 300,000,000.0 |  |  |  |  |  |  |
LPUs [Member] |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Number of limited partnership units granted exchangeability |  |  |  |  | 8.4 |  |  |  |
Newmark [Member] |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Net cash provided by (used in) operating activities from discontinued operations |  |  |  |  |  |  |  | (748,200,000) |
Net cash provided by (used in) investing activities from discontinued operations |  |  |  |  |  |  |  | 18,300,000 |
Income allocated to limited partnership units |  |  |  |  |  |  |  | 37,000,000.0 |
Interest expense recorded |  |  |  |  |  |  |  | 46,100,000 |
Newmark [Member] | Intercompany Credit Agreement [Member] |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Interest expense recorded |  |  |  |  |  |  |  | 3,500,000 |
Newmark [Member] | LPUs [Member] |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Number of limited partnership units granted exchangeability |  |  |  |  | 3.9 |  |  |  |
Equity-based compensation expense |  |  |  |  |  |  |  | $ 111,100,000 |

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