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Related Party Transactions - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Millions |  |  |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 19, 2018 | Mar. 07, 2018 | Dec. 13, 2017 | Sep. 08, 2017 | Mar. 11, 2015 | Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Fees to related parties |  |  |  |  |  | $ 6,894,000 | $ 4,718,000 |
Employee loans |  |  |  |  |  | 226,744,000 |  | $ 209,549,000
Total consideration transferred |  |  |  |  |  |  |  | 55,600,000
Mortgage servicing right recognized |  |  |  |  |  | 17,817,000 | 15,952,000 |
Equity method investments |  |  |  |  |  | 104,718,000 |  | 101,562,000
Receivables from related parties |  |  |  |  |  |  |  | 0
Current portion of payables to related parties |  |  |  |  |  | $ 197,199,000 |  | 34,169,000
Intercompany Credit Agreement [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Interest rate | 1.00% |  |  |  |  |  |  |
Interest rate terms |  |  |  |  |  | The interest rate on the Intercompany Credit Agreement can be the higher of BGC’s or Newmark’s short term borrowings rate in effect at such time plus 100 basis points, or such other interest rate as may be mutually agreed between BGC and Newmark. |  |
Stated interest rate |  |  |  |  |  | 4.99% |  |
Line of credit facility, outstanding amount |  |  |  |  |  | $ 202,000,000 |  |
CF Real Estate Finance Holdings, L.P. [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Equity method investments |  |  |  | $ 100,000,000 |  |  |  |
Loan to related parties |  |  |  |  |  | 339,200,000 |  |
Note Receivable/Payable [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  | 2,100,000 |  |
One Month LIBOR [Member] | Note Receivable/Payable [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Interest rate |  |  |  |  | 1.00% |  |  |
BPF [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Total consideration transferred |  |  |  | 875,000,000 |  |  |  |
Business acquisition price paid in units |  |  |  | $ 3,200,000 |  |  |  |
Business acquisition date |  |  |  | Sep. 08, 2017 |  |  |  |
Business acquisition, transaction agreement date |  |  |  | Jul. 17, 2017 |  |  |  |
Net assets exceeded |  |  |  | $ 508,600,000 |  |  |  |
Gains from Mortgage Banking Activities, Net [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Broker fees and commissions |  |  |  |  |  | 700,000 | 200,000 |
Interest Income, Net [Member] | Intercompany Credit Agreement [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  | 1,000,000 |  |
Loan Referral Agreement [Member] | Gains from Mortgage Banking Activities, Net [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Revenue from loan referral agreement |  |  |  |  |  | 3,700,000 | 300,000 |
Cantor and BGC [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Fees to related parties |  |  |  |  |  | 6,900,000 |  | 4,700,000
Employee Loans [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Employee loans |  |  |  |  |  | 226,700,000 |  | $ 209,600,000
Compensation expense related to employee loans |  |  |  |  |  | 6,000,000 | 2,000,000 |
CCRE [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Fees to related parties |  |  |  |  |  | 0 | 0 |
Recognized related party revenues |  |  |  |  |  | 0 | 60,900,000 |
CCRE [Member] | Primary Servicing Rights [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Servicing rights of loans originated |  |  |  |  |  | 300,000,000 | 0 |
Purchase of loans originated |  |  |  |  |  | 500,000 |  |
Mortgage servicing right recognized |  |  |  |  |  | 0 |  |
Servicing fees |  |  |  |  |  | $ 900,000 | $ 1,000,000 |
Cantor and CCRE and Cantor Commercial Real Estate Sponsor, L.P. [Member] | BPF [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Transaction agreement, distribution |  |  |  | 89,100,000 |  |  |  |
Net assets exceeded |  |  |  | $ 508,600,000 |  |  |  |
CF & Co [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Percentage of gross proceeds paid to underwriter |  |  | 5.50% |  |  |  |  |
Stated interest rate |  |  |  |  |  | 2.18% |  |
BGC Partners LP and its Operating Subsidiaries [Member] | Newmark Units [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Purchase of units |  | 16.6 |  |  |  |  |  |
Purchase value of units |  | $ 242,000,000 |  |  |  |  |  |
Closing price per share |  | $ 14.57 |  |  |  |  |  |

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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66022249&loc=d3e33749-111570 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Income from mortgage banking activities (fees and commissions) and servicing real estate mortgages, credit cards, and other financial assets held by others net of any related impairment of capitalized service costs. Also includes any premiums received in lieu of regular servicing fees on such loans only as earned over the life of the loans. + References No definition available. + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition The cash outflow to obtain servicing rights, which contractually entitle the servicer to receive fees and ancillary revenues for performing billing, collection, disbursement and recordkeeping services in connection with a mortgage portfolio. Rights may be obtained via (1) acquisition or assumption of a servicing obligation that does not relate to financial assets of the servicer or its consolidated affiliates; or (2) by originating mortgage loans and then (a) transferring the loans to a Variable Interest Entity (VIE) in a transaction that meets the necessary transfer and classification requirements, or (b) transferring the loans in a transaction that meets the requirements for sale accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7524895&loc=d3e120260-111741 + Details
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