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Acquisitions - Additional Information (Detail) $ in Thousands |  |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Sep. 08, 2017 USD ($) | Sep. 07, 2017 Office | Jul. 26, 2017 | Mar. 31, 2018 USD ($) Business | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |
Number of businesses acquired | Business |  |  |  | 0 |  |
Total consideration transferred |  |  |  |  | $ 55,600 |
Business acquisition, contingent cash consideration |  |  |  | $ 15,971 | 17,207 |
Additional goodwill recognized |  |  |  | $ 474,990 | 477,532 | $ 412,846
Business acquisition, amount deductible for tax |  |  |  |  | 45,400 |
Business acquisition, aggregate revenue contribution |  |  |  |  | $ 13,100 |
BGC's Holding Partnership Units [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business acquisition price paid (Partnership Units) | shares |  |  |  |  | 477,169 |
Business acquisition, contingent non cash consideration, fair value |  |  |  |  | $ 5,000 |
Business acquisition, contingent cash consideration |  |  |  |  | 1,300 |
Additional goodwill recognized |  |  |  |  | 64,300 |
Cantor [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Noncontrolling interest, ownership percentage |  |  | 25.00% |  |  |
BPF [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business acquisition date | Sep. 08, 2017 |  |  |  |  |
Ownership percentage acquired | 100.00% |  |  |  |  |
Business acquisition, deferred tax asset |  |  |  |  | $ 108,600 |
Total consideration transferred | $ 875,000 |  |  |  |  |
Commercial Real Estate Consulting Firm [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business acquisition date |  |  | Jul. 26, 2017 |  |  |
Ownership percentage acquired |  |  | 50.00% |  |  |
Integra Realty Resources [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business acquisition date |  | Sep. 07, 2017 |  |  |  |
Number of offices acquired | Office |  | 6 |  |  |  |

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