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Acquisitions - Additional Information (Detail) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 30, 2019 USD ($) | Apr. 30, 2019 | Dec. 31, 2018 USD ($) | Sep. 30, 2018 | Jul. 31, 2018 Office | Apr. 30, 2018 Office | Jun. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) shares | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Business acquisition, contingent cash consideration | $ 27,195 |  | $ 28,099 |  |  |  | $ 27,195 | $ 27,195 | $ 28,099 |
Additional goodwill recognized | $ 543,125 |  | $ 515,321 |  |  |  | 543,125 | 543,125 | 515,321 | $ 477,532
Business acquisition, aggregate revenue contribution |  |  |  |  |  |  | 1,700 | 1,700 | 28,500 |
MLG Commercial LLC [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Business acquisition date |  | Apr. 30, 2019 |  |  |  |  |  |  |  |
ACRES [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Business acquisition date | Jun. 30, 2019 |  |  |  |  |  |  |  |  |
Two Thousand Nineteen Acquisitions [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Total consideration transferred |  |  |  |  |  |  |  | 31,900 |  |
Business acquisition, contingent cash consideration | $ 7,800 |  |  |  |  |  | 7,800 | 7,800 |  |
Additional goodwill recognized | 27,798 |  |  |  |  |  | 27,798 | 27,798 |  |
Business acquisition, amount deductible for tax | 18,800 |  |  |  |  |  | 18,800 | $ 18,800 |  |
Two Thousand Nineteen Acquisitions [Member] | Newmark Holdings, L.P. [Member] | Limited Partnership Units [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Business acquisition price paid (Partnership Units) | shares |  |  |  |  |  |  |  | 233,779 |  |
Business acquisition, contingent non cash consideration, fair value | $ 1,900 |  |  |  |  |  | $ 1,900 | $ 1,900 |  |
Boston and Pittsburg Acquisitions [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Business acquisition date |  |  |  |  |  | Apr. 30, 2018 |  |  |  |
Number of offices acquired | Office |  |  |  |  |  | 2 |  |  |  |
Denver and Pasadena Acquisitions [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Business acquisition date |  |  |  |  | Jul. 31, 2018 |  |  |  |  |
Number of offices acquired | Office |  |  |  |  | 2 |  |  |  |  |
RKF Retail Holdings LLC Acquisitions [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Business acquisition date |  |  |  | Sep. 30, 2018 |  |  |  |  |  |
MiT National Land Services LLC Acquisitions [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Business acquisition date |  |  | Dec. 31, 2018 |  |  |  |  |  |  |
Two Thousand Eighteen Acquisitions [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Total consideration transferred |  |  |  |  |  |  |  |  | 62,900 |
Business acquisition, contingent cash consideration |  |  | $ 8,600 |  |  |  |  |  | 8,600 |
Additional goodwill recognized |  |  | 42,188 |  |  |  |  |  | 42,188 |
Business acquisition, amount deductible for tax |  |  | 28,600 |  |  |  |  |  | $ 28,600 |
Two Thousand Eighteen Acquisitions [Member] | Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Business acquisition price paid (Partnership Units) | shares |  |  |  |  |  |  |  |  | 216,900 |
Business acquisition, contingent non cash consideration, fair value |  |  | 3,100 |  |  |  |  |  | $ 3,100 |
Two Thousand Eighteen Acquisitions [Member] | Newmark Holdings, L.P. [Member] | Limited Partnership Units [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Business acquisition price paid (Partnership Units) | shares |  |  |  |  |  |  |  |  | 465,316 |
Business acquisition, contingent non cash consideration, fair value |  |  | $ 6,200 |  |  |  |  |  | $ 6,200 |

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