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Organization and Basis of Presentation - Additional Information (Detail) - USD ($) |  |  |  |  |  |  | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 19, 2018 | Mar. 07, 2018 | Dec. 26, 2017 | Dec. 15, 2017 | Nov. 22, 2017 | Sep. 08, 2017 | Mar. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2018 | Dec. 09, 2014 | Jun. 26, 2012
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total consideration transferred |  |  |  |  |  |  |  | $ 55,600,000 |  |  |
Equity method investments |  |  |  |  |  |  | $ 104,718,000 | 101,562,000 |  |  |
Fully diluted weighted-average shares of common stock outstanding |  |  |  |  |  |  | 246,834,000 |  |  |  |
Assets |  |  |  |  |  |  | $ 3,057,150,000 | 2,273,007,000 |  |  |
Liabilities |  |  |  |  |  |  | 2,503,468,000 | 2,029,593,000 |  |  |
Retained earnings |  |  |  |  |  |  | 238,096,000 | 199,492,000 |  |  |
Noncontrolling interests |  |  |  |  |  |  | 237,460,000 | $ (38,092,000) |  |  |
ASU No. 2014-09 [Member] | Impact of ASC 606 [Member] |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  | $ 64,400,000 |  |
Liabilities |  |  |  |  |  |  |  |  | 45,600,000 |  |
Retained earnings |  |  |  |  |  |  |  |  | 16,500,000 |  |
Noncontrolling interests |  |  |  |  |  |  |  |  | $ 2,300,000 |  |
Intercompany Credit Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, outstanding amount |  |  |  |  |  |  | $ 202,000,000 |  |  |  |
Stated interest rate |  |  |  |  |  |  | 4.99% |  |  |  |
Interest rate | 1.00% |  |  |  |  |  |  |  |  |  |
Intercompany Credit Agreement [Member] | Interest Income, Net [Member] |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  | $ 1,000,000 |  |  |  |
Term Loan Credit Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |
Expected repayment of long-term debt owed |  |  |  |  |  |  | 0 |  |  |  |
Principal amount of notes |  |  |  |  | $ 575,000,000 |  |  |  |  |  |
Net proceeds from the IPO to partially repay the term loan |  |  |  |  | 304,300,000 |  |  |  |  |  |
Repayments of debt |  |  |  |  |  |  | $ 270,700,000 |  |  |  |
8.125% Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal amount of notes |  |  |  |  |  |  |  |  |  |  | $ 112,500,000
Stated interest rate |  |  |  |  |  |  | 8.125% |  |  |  |
Debt maturity year |  |  |  |  |  |  | 2042 |  |  |  |
5.375% Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal amount of notes |  |  |  |  |  |  |  |  |  | $ 300,000,000 |
Stated interest rate |  |  |  |  |  |  | 5.375% |  |  |  |
Debt maturity year |  |  |  |  |  |  | 2019 |  |  |  |
Class A Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock issued during period, shares, new issues |  |  |  |  |  |  |  | 23,000,000 |  |  |
Common stock, shares outstanding |  |  |  |  |  |  | 138,922,000 | 138,594,000 |  |  |
IPO [Member] |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interest, ownership percentage |  |  | 9.80% |  |  |  |  |  |  |  |
Fully diluted weighted-average shares of common stock outstanding |  |  | 234,200,000 |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |
Proceeds from Newmark initial public offering, net of underwriting discounts and commissions |  |  | $ 295,400,000 |  |  |  |  |  |  |  |
Noncontrolling interest, ownership percentage |  |  | 16.60% |  |  |  |  |  |  |  |
Common stock, shares outstanding |  |  | 138,600,000 |  |  |  |  |  |  |  |
Newmark Units [Member] |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |
Expected repayment of long-term debt owed |  |  |  |  |  |  | $ 812,500,000 |  |  |  |
Newmark Units [Member] | BGC Partners LP and its Operating Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |
Closing price per share |  | $ 14.57 |  |  |  |  |  |  |  |  |
Purchase of units |  | 16,600,000 |  |  |  |  |  |  |  |  |
Purchase value of units |  | $ 242,000,000 |  |  |  |  |  |  |  |  |
BPF [Member] |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |
Business acquisition date |  |  |  |  |  | Sep. 08, 2017 |  |  |  |  |
Ownership percentage acquired |  |  |  |  |  | 100.00% |  |  |  |  |
Total consideration transferred |  |  |  |  |  | $ 875,000,000 |  |  |  |  |
Business acquisition price paid in units |  |  |  |  |  | 3,200,000 |  |  |  |  |
Business acquisition post closing adjustments |  |  |  |  |  | $ 508,600,000 |  |  |  |  |
Number of trading days prior to closing |  |  |  |  |  | 3 days |  |  |  |  |
BPF [Member] | Partnership Units [Member] |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |
Business acquisition price paid (Partnership Units) |  |  |  |  |  | 247,099 |  |  |  |  |
CF Real Estate Finance Holdings, L.P. [Member] |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity method investments |  |  |  |  |  | $ 100,000,000 |  |  |  |  |
Revolver Amendment [Member] |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum revolving credit |  |  |  |  | 400,000,000 |  |  |  |  |  |
Line of credit facility, outstanding amount |  |  |  |  | $ 400,000,000 |  |  |  |  |  |

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