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Supplemental Balance Sheet Information - Summary of Components of Balance Sheet Accounts (Parenthetical) (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Accrued expenses and other liabilities | [1] | $ 856,215 | $ 466,306
Operating lease, right-of-use asset | [2] | 169,065 |
Operating lease, liability | [2] | 187,398 |
GFI Merger liability | [3] |  | 25,863
Besso and Ed Broking [Member] |  |  |
Accrued expenses and other liabilities |  | $ 583,200 |
Besso [Member] |  |  |
Accrued expenses and other liabilities |  |  | $ 195,000
[1] | As of December 31, 2019, $583.2 million is attributable to Besso and Ed Broking. As of December 31, 2018, $195.0 million, is attributable to Besso. See “Cash Segregated Under Regulatory Requirements” and “Accrued Commissions and Other Receivables, Net” in Note 3—“Summary of Significant Accounting Policies” for additional information.
[2] | As of December 31, 2019, $169.1 million and $187.4 million, relating to lease ROU assets and lease liabilities, respectively, is attributable to the adoption of ASU No. 2016-02, Leases (Topic 842). See Note 25—“Leases”, in addition to the information under the heading “Recently Adopted Accounting Pronouncements” included in Note 1—“Organization and Basis of Presentation” for additional information.
[3] | On January 12, 2016, BGC completed the GFI Merger, which allowed BGC to acquire the remaining outstanding shares of GFI common stock that BGC did not already own. Following the closing of the GFI Merger, BGC and its affiliates owned 100% of the outstanding shares of GFI’s common stock. The liability of $25.9 million as of December 31, 2018 represented a liability still remaining with respect to the completion of the GFI Merger and was settled in March 2019.

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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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