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Long-Term Debt - Additional Information (Detail) - USD ($) |  |  |  |  |  |  |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 28, 2018 | Nov. 23, 2018 | Nov. 06, 2018 | Sep. 26, 2018 | Sep. 05, 2018 | Sep. 04, 2018 | Jun. 19, 2018 | Dec. 13, 2017 | Sep. 08, 2017 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  | $ 582,840,000 |  | $ 582,840,000 |  | $ 537,926,000
Repayments of credit agreement |  |  |  |  |  |  |  |  |  |  |  | 3,677,675,000 | $ 2,479,696,000 |
Borrowings from credit agreement |  |  |  |  |  |  |  |  |  |  |  | 3,498,483,000 | 2,659,827,000 |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  | 43,600,000 |  | 43,600,000 |  |
Debt issuance cost |  |  |  |  |  |  |  |  |  | 1,400,000 |  | 1,400,000 |  |
Amortization of debt issuance costs |  |  |  |  |  |  |  |  |  | 100,000 |  | $ 300,000 |  |
Maximum revolving credit | $ 250,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Credit agreement maturity period | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, interest rate description |  |  |  |  |  |  |  |  |  |  |  | Borrowings under the Credit Facility will bear an annual interest equal to, at Newmark’s option, either (a) LIBOR for specified periods, or upon the consent of all Lenders, such other period that is 12 months or less, plus an applicable margin, or (b) a base rate equal to the greatest of (i) the federal funds rate plus 0.5%, (ii) the prime rate as established by the administrative agent, and (iii) one-month LIBOR plus 1.0%. |  |
Revolving Credit Facility [Member] | Federal Fund Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable margin | 0.50% |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | One Month LIBOR [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable margin | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable margin | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | LIBOR [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable margin | 0.25% |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | LIBOR [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable margin | 1.25% |  |  |  |  |  |  |  |  |  |  |  |  |
Intercompany Credit Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  | 6.50% |  |  |  |  |  |  |  |
Borrowings from credit agreement |  |  |  |  |  | $ 112,500,000 |  |  |  |  |  |  |  |
Interest Expense, Net [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  | $ 800,000 |  | $ 1,000,000.0 |  |
Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  |  | $ 2,600,000 |  | 2,600,000 |
Maximum revolving credit |  |  |  |  |  |  |  |  | $ 575,000,000.0 |  |  |  |  |
Credit agreement maturity date |  |  |  |  |  |  |  |  |  |  |  | Sep. 08, 2019 |  |
Line of credit facility, description |  |  |  |  |  |  |  |  |  |  |  | Borrowings under the Term Loan bore interest at either LIBOR or a defined base rate plus an additional margin which ranged from 50 basis points to 325 basis points depending on BGC’s debt rating as determined by S&P and Fitch and whether such loan was a LIBOR loan or a base rate loan. |  |
Repayments of credit agreement |  |  |  |  |  |  |  | $ 304,300,000 |  |  |  |  |  | 270,700,000
Term Loan [Member] | LIBOR or Defined Base Rate [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable margin |  |  |  |  |  |  |  |  | 0.50% |  |  |  |  |
Term Loan [Member] | LIBOR or Defined Base Rate [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable margin |  |  |  |  |  |  |  |  | 3.25% |  |  |  |  |
Converted Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0
Interest expense |  |  |  |  |  |  |  |  |  |  | 4,400,000 |  | 9,000,000.0 |
Maximum revolving credit |  |  |  |  |  |  |  |  | $ 400,000,000.0 |  |  |  |  |
Credit agreement maturity date |  |  |  |  |  |  |  |  |  |  |  | Sep. 08, 2019 |  |
Line of credit facility, description |  |  |  |  |  |  |  |  |  |  |  | Borrowings under the Converted Term Loan bore interest at either LIBOR or a defined base rate plus an additional margin, which ranged from 50 basis points to 325 basis points depending on BGC’s debt rating as determined by S&P and Fitch and whether such loan was a LIBOR loan or a base rate loan. The Term Loan was paid in full on March 9, 2018. Since the Term Loan was repaid in full, the pricing of the Converted Term Loan returned to the levels previously described. |  |
Converted Term Loan [Member] | RBC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of convertible debt |  |  |  | $ 113,200,000 |  |  | $ 152,900,000 |  |  |  |  |  |  |
Converted Term Loan [Member] | LIBOR or Defined Base Rate [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable margin |  |  |  |  |  |  |  |  | 0.50% |  |  |  |  |
Converted Term Loan [Member] | LIBOR or Defined Base Rate [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable margin |  |  |  |  |  |  |  |  | 3.25% |  |  |  |  |
6.125% Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  | $ 550,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  | 6.125% |  |  |  |  |  |  | 6.125% |  | 6.125% |  | 6.125%
Issued price percentage |  |  | 98.937% |  |  |  |  |  |  |  |  |  |  |
Yield percentage |  |  | 6.375% |  |  |  |  |  |  |  |  |  |  |
Debt instrument, payment terms |  |  |  |  |  |  |  |  |  |  |  | payable on each May 15 and November 15, beginning on May 15, 2019 |  |
Debt instrument, date of first required payment |  |  |  |  |  |  |  |  |  |  |  | May 15, 2019 |  |
Long-term debt |  |  |  |  |  |  |  |  |  | $ 539,206,000 |  | $ 539,206,000 |  | $ 537,926,000
Maturity date |  |  |  |  |  |  |  |  |  |  |  | Nov. 15, 2023 |  |
Debt instrument, issuance date |  |  |  |  |  |  |  |  |  |  |  | Nov. 01, 2018 |  |
Debt issuance cost |  |  |  |  |  |  |  |  |  | 5,600,000 |  | $ 5,600,000 |  |
Debt discount |  |  |  |  |  |  |  |  |  | 5,200,000 |  | 5,200,000 |  |
Amortization of debt issuance costs |  |  |  |  |  |  |  |  |  | 300,000 |  | 600,000 |  |
6.125% Senior Notes [Member] | Interest Expense, Net [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  | 8,700,000 |  | 17,400,000 |  |
6.125% Senior Notes [Member] | Converted Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of convertible debt |  |  | $ 134,000,000.0 |  |  |  |  |  |  |  |  |  |  |
6.125% Senior Notes [Member] | Straight Line Method [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of debt issuance costs |  |  |  |  |  |  |  |  |  | $ 300,000 |  | $ 600,000 |  |
2019 Promissory Note [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  | 5.375% |  |  |  |  |  |
Maturity date |  |  |  |  |  |  |  |  |  |  |  | Dec. 09, 2019 |  |
Interest expense |  |  |  |  |  |  |  |  |  |  | 4,300,000 |  | 8,600,000 |
Promissory Note |  |  |  |  |  |  |  | $ 300,000,000.0 |  |  |  |  |  |
Repayments of debt |  | $ 300,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |
Prepayment penalty |  | $ 7,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |
2042 Promissory Note [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  | 8.125% |  |  |  |  |  |
Maturity date |  |  |  |  |  |  |  |  |  |  |  | Jun. 26, 2042 |  |
Interest expense |  |  |  |  |  |  |  |  |  |  | $ 2,300,000 |  | $ 4,600,000 |
Promissory Note |  |  |  |  |  |  |  | $ 112,500,000 |  |  |  |  |  |
Repayments of debt |  |  |  |  | $ 112,500,000 | $ 112,500,000 |  |  |  |  |  |  |  |

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