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Organization and Basis of Presentation - Additional Information (Detail)												3 Months Ended			9 Months Ended		12 Months Ended
	Dec. 05, 2018 USD ($)	Nov. 06, 2018 USD ($)	Nov. 05, 2018	Oct. 04, 2018 USD ($)	Aug. 01, 2018 USD ($)	Mar. 19, 2018 USD ($)	Mar. 07, 2018 USD ($) shares	Dec. 26, 2017 USD ($) shares	Dec. 15, 2017 $ / shares shares	Nov. 22, 2017 USD ($)	Sep. 08, 2017 USD ($) shares	Sep. 30, 2018 USD ($) shares	Jun. 30, 2018 USD ($)	Sep. 30, 2017 shares	Sep. 30, 2018 USD ($) Segment shares	Sep. 30, 2017 shares	Dec. 31, 2017 USD ($) shares	Sep. 25, 2018 USD ($)	Sep. 05, 2018 USD ($)	Sep. 04, 2018 USD ($)	Aug. 06, 2018 USD ($)	Jun. 18, 2018 USD ($)	Mar. 18, 2018 USD ($)	Jan. 01, 2018 USD ($)	Apr. 21, 2017 USD ($)	Dec. 09, 2014 USD ($)	Jun. 26, 2012 USD ($)
Description Of Business [Line Items]
Number of servicing segments | Segment															2
Total consideration transferred															$ 61,200,000		$ 1,000,000,000
Equity method investments												$ 136,100,000			$ 136,100,000		135,600,000
Fully diluted weighted-average shares of common stock outstanding | shares												487,636,000		457,341,000	482,711,000	451,348,000
Expected repayment of debt												$ 1,040,862,000			$ 1,040,862,000		946,930,000
Assets												8,732,296,000			8,732,296,000		5,429,712,000
Liabilities												6,791,867,000			6,791,867,000		4,243,556,000
Noncontrolling interest in subsidiaries												867,822,000			867,822,000		505,855,000
Retained deficit												(798,717,000)			(798,717,000)		(859,009,000)
Accumulated other comprehensive income (loss)												$ (21,553,000)			(21,553,000)		$ (10,486,000)
ASU No. 2014-09 [Member]
Description Of Business [Line Items]
Assets																								$ 64,400,000
Liabilities																								41,900,000
Noncontrolling interest in subsidiaries																								2,300,000
Retained deficit																								20,200,000
ASU No. 2014-09 [Member] | Retained Deficit [Member]
Description Of Business [Line Items]
Tax effect impact for increase or decrease to the liability																								3,900,000
ASU No. 2014-09 [Member] | Deferred Tax Liability [Member]
Description Of Business [Line Items]
Tax effect impact for increase or decrease to the liability																								3,900,000
ASU No. 2018-03 [Member]
Description Of Business [Line Items]
Noncontrolling interest in subsidiaries																								800,000
Retained deficit																								2,100,000
Accumulated other comprehensive income (loss)																								2,900,000
ASU No. 2018-03 [Member] | Retained Deficit [Member]
Description Of Business [Line Items]
Tax effect impact for increase or decrease to the liability																								400,000
ASU No. 2018-03 [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
Description Of Business [Line Items]
Tax effect impact for increase or decrease to the liability																								600,000
ASU No. 2018-03 [Member] | Noncontrolling Interest in Subsidiaries [Member]
Description Of Business [Line Items]
Tax effect impact for increase or decrease to the liability																								$ 200,000
Nasdaq [Member]
Description Of Business [Line Items]
Purchase consideration paid in cash															$ 750,000,000
Period for expected payment under Common stock transaction															15 years
Nasdaq [Member] | Maximum [Member]
Description Of Business [Line Items]
Expected payment of shares under common stock transaction | shares															14,900,000
Nasdaq [Member] | Minimum [Member]
Description Of Business [Line Items]
Gross revenue on expected payment per year under common stock transaction.															$ 25,000,000
RBC [Member] | Nasdaq [Member] | Forward Contracts [Member] | Maximum [Member]
Description Of Business [Line Items]
Shares received from transaction | shares															992,247
Cantor [Member]
Description Of Business [Line Items]
Noncontrolling interest, ownership percentage												48.00%			48.00%
Line of credit facility, outstanding amount											$ 150,000,000	$ 0			$ 0
Maximum revolving credit																									$ 150,000,000
Revolving Credit Facility [Member] | Cantor [Member]
Description Of Business [Line Items]
Principal amount of notes						$ 250,000,000															$ 400,000,000		$ 150,000,000
Stated interest rate												5.51%			5.51%
Line of credit facility, outstanding amount												$ 80,000,000			$ 80,000,000
Credit agreement, description															The BGC Credit Agreement will mature on the earlier to occur of (a) March 19, 2019, after which the maturity date of the BGC Credit Agreement will continue to be extended for successive one-year periods unless prior written notice of non-extension is given by a lending party to a borrowing party at least six months in advance of such renewal date and (b) the termination of the BGC Credit Agreement by either party pursuant to its terms.
Credit agreement, interest rate description															The outstanding amounts under the BGC Credit Agreement will bear interest for any rate period at a per annum rate equal to the higher of BGC’s or Cantor’s short-term borrowing rate in effect at such time plus 1.00%
Interest rate						1.00%
Line of credit facility, borrowing amount												$ 80,000,000			$ 80,000,000
8.125% Senior Notes Due 2042 [Member]
Description Of Business [Line Items]
Principal amount of notes																											$ 112,500,000
Stated interest rate												8.125%			8.125%		8.125%
Debt maturity year															2042
Repayments of outstanding borrowings					$ 112,500,000
Expected repayment of debt																	$ 109,396,000
6.125% Senior Notes Due 2023 [Member]
Description Of Business [Line Items]
Stated interest rate												6.125%			6.125%
5.375% Senior Notes Due 2019 [Member]
Description Of Business [Line Items]
Principal amount of notes																										$ 300,000,000
Stated interest rate												5.375%			5.375%		5.375%
Debt maturity year															2019
Expected repayment of debt												$ 298,801,000			$ 298,801,000		$ 298,064,000
5.375% Senior Notes Due 2019 [Member] | Scenario Forecast [Member]
Description Of Business [Line Items]
Repayments of outstanding borrowings	$ 300,000,000
Term Loan Credit Agreement [Member]
Description Of Business [Line Items]
Principal amount of notes										$ 575,000,000
Net proceeds from the IPO to partially repay the term loan										304,300,000
Line of credit facility, outstanding amount																	$ 270,700,000
Revolver Amendment [Member]
Description Of Business [Line Items]
Line of credit facility, outstanding amount										400,000,000
Maximum revolving credit										$ 400,000,000
Revolving Credit Agreement [Member]
Description Of Business [Line Items]
Interest rate						1.00%
Line of credit facility, borrowing amount						$ 150,000,000
5.41% Revolving Credit Facility [Member]
Description Of Business [Line Items]
Stated interest rate												5.41%			5.41%
Line of credit facility, outstanding amount												$ 270,000,000			$ 270,000,000
6.5% Revolving Credit Facility [Member]
Description Of Business [Line Items]
Stated interest rate												6.50%			6.50%
Line of credit facility, outstanding amount												$ 112,500,000			$ 112,500,000
Converted Term Loan [Member] | Subsequent Event [Member] | Unsecured Debt [Member]
Description Of Business [Line Items]
Repayments of outstanding borrowings		$ 134,000,000
Class A Common Stock [Member]
Description Of Business [Line Items]
Issuance of Class A common stock (net of costs), shares | shares															25,975,240		1,994,670
Common stock, shares outstanding | shares												293,512,000			293,512,000		256,968,000
IPO [Member]
Description Of Business [Line Items]
Net proceeds from the IPO to partially repay the term loan															$ 304,300,000
CF Real Estate Finance Holdings, L.P. [Member]
Description Of Business [Line Items]
Equity method investments											$ 100,000,000
BPF [Member]
Description Of Business [Line Items]
Business acquisition date											Jul. 17, 2017
Total consideration transferred											$ 875,000,000
Business acquisition price paid in units											3,200,000
Business acquisition post closing adjustments											$ 508,600,000
Business acquisition date											Sep. 08, 2017
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) | shares											247,099
Newmark [Member]
Description Of Business [Line Items]
Expected repayment of debt												$ 434,000,000			434,000,000
Cash received from transactions												113,200,000	$ 152,900,000
Newmark [Member] | Fannie Mae [Member]
Description Of Business [Line Items]
Loans pledged as collateral												260,600,000			260,600,000
Newmark [Member] | Subsequent Event [Member] | Fannie Mae [Member]
Description Of Business [Line Items]
Proceeds from withdrew of cash pledge				$ 252,000,000
Newmark [Member] | Intercompany Credit Agreement [Member]
Description Of Business [Line Items]
Expected repayment of debt												382,500,000			382,500,000
Newmark [Member] | Intercompany Credit Agreement [Member] | Subsequent Event [Member]
Description Of Business [Line Items]
Repayments of outstanding borrowings		112,500,000		$ 252,000,000
Newmark [Member] | 8.125% Senior Notes Due 2042 [Member]
Description Of Business [Line Items]
Principal amount of notes																				$ 112,500,000
Stated interest rate																			8.125%	6.50%
Redmeed outstanding principal amount of notes																			$ 112,500,000
Newmark [Member] | 6.125% Senior Notes Due 2023 [Member] | Subsequent Event [Member]
Description Of Business [Line Items]
Principal amount of notes		$ 550,000,000
Stated interest rate		6.125%	6.125%
Debt maturity year		2023
Newmark [Member] | 6.125% Senior Notes Due 2023 [Member] | Intercompany Credit Agreement [Member] | Subsequent Event [Member]
Description Of Business [Line Items]
Repayments of outstanding borrowings		$ 112,500,000
Newmark [Member] | 5.375% Senior Notes Due 2019 [Member] | Scenario Forecast [Member]
Description Of Business [Line Items]
Repayments of outstanding borrowings	300,000,000
Newmark [Member] | Converted Term Loan [Member] | Subsequent Event [Member] | Unsecured Debt [Member]
Description Of Business [Line Items]
Repayments of outstanding borrowings		$ 134,000,000
Newmark [Member] | IPO [Member]
Description Of Business [Line Items]
Noncontrolling interest, ownership percentage								9.80%
Fully diluted weighted-average shares of common stock outstanding | shares								234,200,000
Newmark [Member] | IPO [Member] | Class A Common Stock [Member]
Description Of Business [Line Items]
Issuance of Class A common stock (net of costs), shares | shares									20,000,000
Closing price per share | $ / shares									$ 14.00
Option to purchase additional shares | shares								3,000,000
Proceeds from Newmark initial public offering								$ 295,400,000
Noncontrolling interest, ownership percentage								16.60%
Common stock, shares outstanding | shares								138,600,000
Options to purchase additional shares of common stock period									30 days
Newmark [Member] | Limited Partnership Units [Member]
Description Of Business [Line Items]
Aggregate exchangeable limited partnership units purchased | shares							16,600,000
Aggregate consideration amount							$ 242,000,000
Newmark Partners L.P [Member] | RBC [Member]
Description Of Business [Line Items]
Exchangeable preferred limited partnership units issued												$ 325,000,000			$ 325,000,000			$ 150,000,000				$ 175,000,000
Newmark Partners L.P [Member] | 5.375% Senior Notes Due 2019 [Member] | Scenario Forecast [Member]
Description Of Business [Line Items]
Repayments of outstanding borrowings	$ 300,000,000
Newmark Partners L.P [Member] | 5.375% Senior Notes Due 2019 [Member] | Subsequent Event [Member]
Description Of Business [Line Items]
Stated interest rate			5.375%
Debt maturity year			2019

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