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Long-Term Debt - Credit Facility Narratives (Details) - USD ($) |  |  |  | 3 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 16, 2020 | Feb. 26, 2020 | Nov. 28, 2018 | Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Line of Credit Facility |  |  |  |  |  |
Proceeds from warehouse facilities |  |  |  | $ 2,164,595,000 | $ 2,545,715,000 |
Repayments of lines of credit |  |  |  | 2,408,764,000 | $ 2,052,041,000 |
Line of Credit | Revolving Credit Facility |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |
Maximum revolving credit | $ 465,000,000.0 | $ 425,000,000.0 |  |  |  |
Long-term debt term (in years) |  |  | 3 years |  |  |
Proceeds from warehouse facilities |  |  |  | 30,000,000.0 |  |
Repayments of lines of credit |  |  |  | $ 30,000,000.0 |  |
Stated interest rate (in percentage) |  |  |  | 1.86% |  | 2.53%
Line of Credit | Revolving Credit Facility | NEWMARK Group Inc Parent |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |
Maximum revolving credit |  |  | $ 250,000,000.0 |  |  |
LIBOR | Line of Credit | Revolving Credit Facility |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |
Basis spread on variable rate (in percentage) | 1.75% | 1.75% |  |  |  |
Interest Rate Option One | LIBOR | Line of Credit | Revolving Credit Facility | NEWMARK Group Inc Parent |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |
Basis spread on variable rate (in percentage) |  |  | 1.00% |  |  |
Interest Rate Option Two | Federal Funds Rate | Line of Credit | Revolving Credit Facility | NEWMARK Group Inc Parent |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |
Basis spread on variable rate (in percentage) |  |  | 0.50% |  |  |
Interest Rate Option Two | One-month LIBOR | Line of Credit | Revolving Credit Facility | NEWMARK Group Inc Parent |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |
Basis spread on variable rate (in percentage) |  |  | 1.00% |  |  |
Interest Rate Option Two | LIBOR | Line of Credit | Revolving Credit Facility | NEWMARK Group Inc Parent |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |
Basis spread on variable rate (in percentage) |  |  | 2.00% |  |  |
Minimum | Interest Rate Option One | LIBOR | Line of Credit | Revolving Credit Facility | NEWMARK Group Inc Parent |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |
Basis spread on variable rate (in percentage) |  |  | 0.25% |  |  |
Minimum | Interest Rate Option Two | LIBOR | Line of Credit | Revolving Credit Facility | NEWMARK Group Inc Parent |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |
Basis spread on variable rate (in percentage) |  |  | 1.25% |  |  |
Maximum | Interest Rate Option One | LIBOR | Line of Credit | Revolving Credit Facility | NEWMARK Group Inc Parent |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |
Basis spread on variable rate (in percentage) |  |  | 1.25% |  |  |
Maximum | Interest Rate Option Two | LIBOR | Line of Credit | Revolving Credit Facility | NEWMARK Group Inc Parent |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |
Basis spread on variable rate (in percentage) |  |  | 2.25% |  |  |
Weighted Average | Line of Credit | Revolving Credit Facility |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |
Interest rate in the period (in percentage) |  |  |  | 1.88% | 3.43% |

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