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Organization and Basis of Presentation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  |  |  |  |  |  | 3 Months Ended | 6 Months Ended |  |  |  |  |  |
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Nov. 30, 2018 | Nov. 23, 2018 | Sep. 05, 2018 | Sep. 04, 2018 | Mar. 19, 2018 | Mar. 07, 2018 | Dec. 26, 2017 | Dec. 15, 2017 | Sep. 08, 2017 | Jun. 28, 2013 | Jun. 30, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Jan. 01, 2019 | Dec. 31, 2018 | Sep. 26, 2018 | Jun. 18, 2018 | Jan. 01, 2018 | Dec. 13, 2017
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investments |  |  |  |  |  |  |  |  |  |  | $ 106,010 |  |  | $ 106,010 |  |  | $ 101,275 |  |  |  |
Purchase of units |  |  |  |  |  | 16,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase value of units |  |  |  |  |  | $ 242,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of exchangeable preferred partnership units |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 152,886 |  |  |  |  |  |
Exchange Ratio Number of Common Shares Received Under Spin Off Transaction |  |  |  |  |  |  |  |  |  |  | 94.95% |  |  | 94.95% |  |  |  |  |  |  |
Number of common shares under spin off transaction | 14,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest percentage | 94.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Economic interest ownership percentage | 87.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock units issued | 1,458,931 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  | $ 3,506,858 |  |  | $ 3,506,858 |  |  | 3,454,157 |  |  |  |
Liabilities |  |  |  |  |  |  |  |  |  |  | 2,464,140 |  |  | 2,464,140 |  |  | 2,371,188 |  |  |  |
Retained earnings |  |  |  |  |  |  |  |  |  |  | 277,115 |  |  | 277,115 |  |  | 277,952 |  |  |  |
Noncontrolling interests |  |  |  |  |  |  |  |  |  |  | 456,078 |  |  | 456,078 |  |  | $ 489,230 |  |  |  |
ROU asset |  |  |  |  |  |  |  |  |  |  | 192,498 |  |  | 192,498 |  |  |  |  |  |  |
ROU liability |  |  |  |  |  |  |  |  |  |  | 243,683 |  |  | 243,683 |  |  |  |  |  |  |
ASU No. 2014-09 [Member] | Impact of ASC 606 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 64,400 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 45,600 |
Retained earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 16,500 |
Noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,300 |
ASU 2016-02 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ROU asset |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 178,800 |  |  |  |  |
ROU liability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 226,700 |  |  |  |  |
Newmark OpCo [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common shares under spin off transaction | 7,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
RBC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of exchangeable preferred partnership units |  |  |  |  |  |  |  |  |  |  |  | $ 113,200 | $ 152,900 |  |  |  |  |  |  |  |
RBC [Member] | Newmark OpCo [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchangeable preferred limited partnership units issued |  |  |  |  |  |  |  |  |  |  | $ 325,000 |  |  | $ 325,000 |  |  |  | $ 150,000 | $ 175,000 |  |
NASDAQ [Member] | Maximum [Member] | Forward Contracts [Member] | RBC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares received from transaction |  |  |  |  |  |  |  |  |  |  |  |  |  | 992,247 |  |  |  |  |  |  |
Intercompany Credit Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 6.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BGC Partners Inc [Member] | NASDAQ [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration received on sale of assets |  |  |  |  |  |  |  |  |  | $ 750,000 |  |  |  |  |  |  |  |  |  |  |
Period for expected payment under Common stock transaction |  |  |  |  |  |  |  |  |  | 15 years |  |  |  |  |  |  |  |  |  |  |
BGC Partners Inc [Member] | NASDAQ [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected payment of shares under common stock transaction |  |  |  |  |  |  |  |  |  | 14,883,705 |  |  |  |  |  |  |  |  |  |  |
BGC Partners Inc [Member] | NASDAQ [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross revenue on expected payment per year under common stock transaction. |  |  |  |  |  |  |  |  |  | $ 25,000 |  |  |  |  |  |  |  |  |  |  |
BGC Partners Inc [Member] | Intercompany Credit Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from debt |  |  |  |  | $ 150,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2042 Promissory Note [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.125%
Repayments of debt |  |  | $ 112,500 | $ 112,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2019 Promissory Note [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.375%
Repayments of debt |  | $ 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class A Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued during period, shares, new issues |  |  |  |  |  |  |  |  |  |  | 28,484 |  |  | 36,935 |  |  |  |  |  |  |
Exchange Ratio Number of Common Shares Received Under Spin Off Transaction | 46.3895% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common shares under spin off transaction | 9,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued | 131,886,409 |  |  |  |  |  |  |  |  |  | 158,342,559 |  |  | 158,342,559 |  |  | 156,966,336 |  |  |  |
Common stock units issued | 449,917 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class A Common Stock [Member] | Newmark OpCo [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common shares under spin off transaction | 6,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class B Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange Ratio Number of Common Shares Received Under Spin Off Transaction | 46.3895% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common shares under spin off transaction | 5,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued | 21,285,537 |  |  |  |  |  |  |  |  |  | 21,285,533 |  |  | 21,285,533 |  |  | 21,285,533 |  |  |  |
IPO [Member] | Class A Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued during period, shares, new issues |  |  |  |  |  |  |  | 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Closing price per share |  |  |  |  |  |  |  | $ 14.00 |  |  |  |  |  |  |  |  |  |  |  |  |
Options to purchase additional shares of common stock period |  |  |  |  |  |  |  | 30 days |  |  |  |  |  |  |  |  |  |  |  |  |
Option to purchase additional shares |  |  |  |  |  |  | 3,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
CF Real Estate Finance Holdings, L.P. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investments |  |  |  |  |  |  |  |  | $ 100,000 |  |  |  |  |  |  |  |  |  |  |  |
BPF [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition date |  |  |  |  |  |  |  |  | Sep. 08, 2017 |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage acquired |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |

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