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Discontinued Operations - Additional Information (Detail) - USD ($) shares in Millions |  |  |  | 3 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Nov. 23, 2018 | Nov. 07, 2018 | Sep. 05, 2018 | Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018 | Mar. 19, 2018
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Net cash used in operating activities from discontinued operations |  |  |  |  | $ (485,477,000) |  |
Net cash provided by investing activities from discontinued operations |  |  |  |  | 40,822,000 |  |
Equity-based compensation expense |  |  |  | $ 1,100,000 |  |  |
Income allocated to limited partnership units |  |  |  | 4,500,000 | 3,800,000 |  |
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 |  |  |  |  |
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
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 |  |  | $ 150,000,000
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% | 8.125% |  | 8.125% |
Debt maturity year |  |  | 2042 | 2042 |  |  |
Repayments of outstanding borrowings |  |  | $ 112,500,000 |  |  |  |
Interest expense recorded |  |  |  | $ 0 | 0 |  |
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% |  | 5.375% |
Debt maturity year | 2019 |  |  | 2019 |  |  |
Repayments of outstanding borrowings | $ 300,000,000 |  |  |  |  |  |
Interest expense recorded |  |  |  | $ 0 | $ 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 |  |  |  |  |
Newmark [Member] | 8.125% Senior Notes Due 2042 [Member] |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Repayments of outstanding borrowings |  |  | $ 112,500,000 |  |  |  |
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 |  |  |  |  |  |
Limited Partnership Units [Member] |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Number of limited partnership units granted exchangeability |  |  |  |  | 1.5 |  |
Equity-based compensation expense |  |  |  | $ 5,000,000 | $ 34,500,000 |  |
Limited Partnership Units [Member] | Newmark [Member] |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Number of limited partnership units granted exchangeability |  |  |  | 0.1 | 1.4 |  |
Newmark [Member] |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Net cash used in operating activities from discontinued operations |  |  |  |  | $ 485,500,000 |  |
Net cash provided by investing activities from discontinued operations |  |  |  |  | 40,800,000 |  |
Income allocated to limited partnership units |  |  |  |  | 5,300,000 |  |
Interest expense recorded |  |  |  |  | 13,800,000 |  |
Newmark [Member] | Intercompany Credit Agreement [Member] |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Interest expense recorded |  |  |  |  | $ 300,000 |  |
Newmark [Member] | Limited Partnership Units [Member] |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Number of limited partnership units granted exchangeability |  |  |  |  | 0.7 |  |
Equity-based compensation expense |  |  |  |  | $ 21,700,000 |  |

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