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Organization and Basis of Presentation - Additional Information (Detail) |  |  |  |  |  |  | 3 Months Ended | 12 Months Ended |  |  |  |  |
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Mar. 19, 2018 USD ($) | Mar. 07, 2018 USD ($) shares | Dec. 26, 2017 USD ($) shares | Dec. 15, 2017 $ / shares shares | Nov. 22, 2017 USD ($) | Sep. 08, 2017 USD ($) shares | Mar. 31, 2018 USD ($) Segment shares | Mar. 31, 2017 USD ($) shares | Dec. 31, 2017 USD ($) shares | Mar. 18, 2018 USD ($) | Jan. 01, 2018 USD ($) | Apr. 21, 2017 USD ($) | Dec. 09, 2014 USD ($) | Jun. 26, 2012 USD ($)
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of servicing segments | Segment |  |  |  |  |  |  | 2 |  |  |  |  |  |  |
Total consideration transferred |  |  |  |  |  |  |  |  | $ 1,000,000,000 |  |  |  |  |
Equity method investments |  |  |  |  |  |  | $ 139,700 | $ 135,600 |  |  |  |  |  |
Fully diluted weighted-average shares of common stock outstanding | shares |  |  |  |  |  |  | 478,935,000 | 444,826,000 |  |  |  |  |  |
Expected repayment of debt owed |  |  |  |  |  |  | $ 946,258,000 |  | 946,930,000 |  |  |  |  |
Assets |  |  |  |  |  |  | 6,777,496,000 |  | 5,429,712,000 |  |  |  |  |
Liabilities |  |  |  |  |  |  | 5,290,789,000 |  | 4,243,556,000 |  |  |  |  |
Noncontrolling interest in subsidiaries |  |  |  |  |  |  | 561,353,000 |  | 505,855,000 |  |  |  |  |
Retained deficit |  |  |  |  |  |  | (837,753,000) |  | (859,009,000) |  |  |  |  |
Accumulated other comprehensive income (loss) |  |  |  |  |  |  | $ (8,754,000) |  | $ (10,486,000) |  |  |  |  |
ASU No. 2014-09 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  | $ 64,400,000 |  |  |
Liabilities |  |  |  |  |  |  |  |  |  |  | 41,900,000 |  |  |
Noncontrolling interest in subsidiaries |  |  |  |  |  |  |  |  |  |  | 2,300,000 |  |  |
Retained deficit |  |  |  |  |  |  |  |  |  |  | 20,200,000 |  |  |
ASU No. 2014-09 [Member] | Retained Deficit [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax effect impact for increase or decrease to the liability |  |  |  |  |  |  |  |  |  |  | 3,900,000 |  |  |
ASU No. 2014-09 [Member] | Deferred Tax Liability [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax effect impact for increase or decrease to the liability |  |  |  |  |  |  |  |  |  |  | 3,900,000 |  |  |
ASU No. 2018-03 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interest in subsidiaries |  |  |  |  |  |  |  |  |  |  | 800,000 |  |  |
Retained deficit |  |  |  |  |  |  |  |  |  |  | 2,100,000 |  |  |
Accumulated other comprehensive income (loss) |  |  |  |  |  |  |  |  |  |  | 2,900,000 |  |  |
ASU No. 2018-03 [Member] | Retained Deficit [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax effect impact for increase or decrease to the liability |  |  |  |  |  |  |  |  |  |  | 400,000 |  |  |
ASU No. 2018-03 [Member] | Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax effect impact for increase or decrease to the liability |  |  |  |  |  |  |  |  |  |  | 600,000 |  |  |
ASU No. 2018-03 [Member] | Noncontrolling Interest in Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax effect impact for increase or decrease to the liability |  |  |  |  |  |  |  |  |  |  | $ 200,000 |  |  |
Cantor [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interest, ownership percentage |  |  |  |  |  |  | 48.00% |  |  |  |  |  |  |
Line of credit facility, outstanding amount |  |  |  |  |  | $ 150,000,000 | $ 0 |  |  |  |  |  |  |
Maximum revolving credit |  |  |  |  |  |  |  |  |  |  |  | $ 150,000,000 |  |
Revolving Credit Facility [Member] | Cantor [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of notes | $ 250,000,000 |  |  |  |  |  |  |  |  | $ 150,000 |  |  |  |
Stated interest rate |  |  |  |  |  |  | 5.13% |  |  |  |  |  |  |
Line of credit facility, outstanding amount |  |  |  |  |  |  | $ 180,000,000 |  |  |  |  |  |  |
Credit agreement, description |  |  |  |  |  |  | The BGC Credit Agreement will mature on the earlier to occur of (a) March 19, 2019, after which the maturity date of the BGC Credit Agreement will continue to be extended for successive one-year periods unless prior written notice of non-extension is given by a lending party to a borrowing party at least six months in advance of such renewal date and (b) the termination of the BGC Credit Agreement by either party pursuant to its terms. |  |  |  |  |  |  |
Credit agreement, interest rate description |  |  |  |  |  |  | The outstanding amounts under the BGC Credit Agreement will bear interest for any rate period at a per annum rate equal to the higher of BGC’s or Cantor’s short-term borrowing rate in effect at such time plus 1.00% |  |  |  |  |  |  |
Interest rate | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, borrowing amount |  |  |  |  |  |  | $ 180,000,000 |  |  |  |  |  |  |
8.125% Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of notes |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 112,500,000
Stated interest rate |  |  |  |  |  |  | 8.125% |  | 8.125% |  |  |  |  |
Debt maturity year |  |  |  |  |  |  | 2042 |  |  |  |  |  |  |
Expected repayment of debt owed |  |  |  |  |  |  | $ 109,427,000 |  | $ 109,396,000 |  |  |  |  |
5.375% Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of notes |  |  |  |  |  |  |  |  |  |  |  |  | $ 300,000,000 |
Stated interest rate |  |  |  |  |  |  | 5.375% |  | 5.375% |  |  |  |  |
Debt maturity year |  |  |  |  |  |  | 2019 |  |  |  |  |  |  |
Expected repayment of debt owed |  |  |  |  |  |  | $ 298,310,000 |  | $ 298,064,000 |  |  |  |  |
Term Loan Credit Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of notes |  |  |  |  | $ 575,000,000 |  |  |  |  |  |  |  |  |
Net proceeds from the IPO to partially repay the term loan |  |  |  |  | 304,300,000 |  |  |  |  |  |  |  |  |
Line of credit facility, outstanding amount |  |  |  |  |  |  |  |  | $ 270,700,000 |  |  |  |  |
Revolver Amendment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, outstanding amount |  |  |  |  | 400,000,000 |  |  |  |  |  |  |  |  |
Maximum revolving credit |  |  |  |  | $ 400,000,000 |  |  |  |  |  |  |  |  |
Revolving Credit Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate | 4.99% |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, outstanding amount |  |  |  |  |  |  | $ 202,000,000 |  |  |  |  |  |  |
Interest rate | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, borrowing amount | $ 150,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Class A Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of Class A common stock (net of costs), shares | shares |  |  |  |  |  |  | 18,925,702 |  | 1,994,670 |  |  |  |  |
Common stock, shares outstanding | shares |  |  |  |  |  |  | 279,279,000 |  | 256,968,000 |  |  |  |  |
IPO [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from the IPO to partially repay the term loan |  |  |  |  |  |  | $ 304,300,000 |  |  |  |  |  |  |
CF Real Estate Finance Holdings, L.P. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investments |  |  |  |  |  | $ 100,000,000 |  |  |  |  |  |  |  |
BPF [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition date |  |  |  |  |  | Jul. 17, 2017 |  |  |  |  |  |  |  |
Total consideration transferred |  |  |  |  |  | $ 875,000,000 |  |  |  |  |  |  |  |
Business acquisition price paid in units |  |  |  |  |  | 3,200,000 |  |  |  |  |  |  |  |
Business acquisition post closing adjustments |  |  |  |  |  | $ 508,600,000 |  |  |  |  |  |  |  |
Business acquisition date |  |  |  |  |  | Sep. 08, 2017 |  |  |  |  |  |  |  |
Number of trading days prior to closing |  |  |  |  |  | 3 days |  |  |  |  |  |  |  |
BPF [Member] | Partnership Units [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition price paid (Partnership Units) | shares |  |  |  |  |  | 247,099 |  |  |  |  |  |  |  |
Newmark [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected repayment of debt owed |  |  |  |  |  |  | $ 812,500 |  |  |  |  |  |  |
Newmark [Member] | IPO [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interest, ownership percentage |  |  | 9.80% |  |  |  |  |  |  |  |  |  |  |
Fully diluted weighted-average shares of common stock outstanding | shares |  |  | 234,200,000 |  |  |  |  |  |  |  |  |  |  |
Newmark [Member] | IPO [Member] | Class A Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of Class A common stock (net of costs), shares | shares |  |  |  | 20,000,000 |  |  |  |  |  |  |  |  |  |
Closing price per share | $ / shares |  |  |  | $ 14.00 |  |  |  |  |  |  |  |  |  |
Option to purchase additional shares | shares |  |  | 3,000,000 |  |  |  |  |  |  |  |  |  |  |
Proceeds from Newmark initial public offering |  |  | $ 295,400,000 |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interest, ownership percentage |  |  | 16.60% |  |  |  |  |  |  |  |  |  |  |
Common stock, shares outstanding | shares |  |  | 138,600,000 |  |  |  |  |  |  |  |  |  |  |
Options to purchase additional shares of common stock period |  |  |  | 30 days |  |  |  |  |  |  |  |  |  |
Newmark [Member] | Limited Partnership Units [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate exchangeable limited partnership units purchased | shares |  | 16,600,000 |  |  |  |  |  |  |  |  |  |  |  |
Aggregate consideration amount |  | $ 242,000,000 |  |  |  |  |  |  |  |  |  |  |  |

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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 Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future. + 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 210.5-02.19-26) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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