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Fair Value Measurements - Assets and Liabilities Not Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities Owned and Sold, Not yet Purchased, at Fair Value, Security Owned, Including Disposal Group Securities Owned |  | $ 799,719
Securities purchased under agreements to resell | $ 0 | 0
Due from Employees | 46,161 | 43,670
Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities Owned and Sold, Not yet Purchased, at Fair Value, Security Owned, Including Disposal Group Securities Owned |  | 665,943
Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities Owned and Sold, Not yet Purchased, at Fair Value, Security Owned, Including Disposal Group Securities Owned |  | 133,776
Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities Owned and Sold, Not yet Purchased, at Fair Value, Security Owned, Including Disposal Group Securities Owned |  | 0
Fair Value, Nonrecurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value, Estimate Not Practicable, Cash | 35,424 | 79,550
Deposits with clearing organization | 59,352 | 23,297
Securities borrowed | 110,932 | 99,635
Receivables from brokers | 30,133 | 19,024
Securities failed to deliver | 17,840 | 7,173
Clearing organizations | 28,955 | 36,269
Other | 15,622 | 1,316
Total Receivable from brokers, dealers and clearing organizations | 203,482 | 163,417
Receivable from customers | 1,110,835 | 796,934
Due from Employees | 46,161 | 43,670
Fair Value, Estimate Not Practicable, Investment | 85,552 | 73,971
Securities loaned | 249,499 | 234,343
Fair Value Estimate Not Practicable Payable to Correspondent Brokers | 4,102 | 4,548
Securities failed to receive | 6,218 | 14,603
Other | 70 | 267,214
Total payables to brokers, dealers and clearing organizations | 259,889 | 520,708
Payables to customers | 502,807 | 334,735
Fair Value,Estimate not Practicable, Securities sold under Agreements to Repurchase | 342,438 | 287,265
Fair Value, Estimate not Practicable, Senior Secured Notes | 127,033 | 154,988
Fair Value Estimate Not Practicable Bank Call Loans | 82,000 |
Fair Value, Nonrecurring [Member] | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value, Estimate Not Practicable, Cash | 35,424 | 79,550
Deposits with clearing organization | 59,352 | 23,297
Fair Value, Nonrecurring [Member] | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities borrowed | 110,932 | 99,635
Receivables from brokers | 30,133 | 19,024
Securities failed to deliver | 17,840 | 7,173
Clearing organizations | 28,955 | 36,269
Other | 15,622 | 1,316
Total Receivable from brokers, dealers and clearing organizations | 203,482 | 163,417
Receivable from customers | 1,110,835 | 796,934
Due from Employees | 46,161 | 43,670
Fair Value, Estimate Not Practicable, Investment | 85,552 | 73,971
Securities loaned | 249,499 | 234,343
Fair Value Estimate Not Practicable Payable to Correspondent Brokers | 4,102 | 4,548
Securities failed to receive | 6,218 | 14,603
Other | 70 | 267,214
Total payables to brokers, dealers and clearing organizations | 259,889 | 520,708
Payables to customers | 502,807 | 334,735
Fair Value,Estimate not Practicable, Securities sold under Agreements to Repurchase | 342,438 | 287,265
Fair Value, Estimate not Practicable, Senior Secured Notes | 127,033 | 154,988
Fair Value Estimate Not Practicable Bank Call Loans | 82,000 |
Fair Value, Nonrecurring [Member] | Carrying Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value, Estimate Not Practicable, Cash | 35,424 | 79,550
Deposits with clearing organization | 59,352 | 23,297
Securities borrowed | 110,932 | 99,635
Receivables from brokers | 30,133 | 19,024
Securities failed to deliver | 17,840 | 7,173
Clearing organizations | 28,955 | 36,269
Other | 15,622 | 1,316
Total Receivable from brokers, dealers and clearing organizations | 203,482 | 163,417
Receivable from customers | 1,110,835 | 796,934
Due from Employees | 46,161 | 43,670
Fair Value, Estimate Not Practicable, Investment | 85,552 | 73,971
Securities loaned | 249,499 | 234,343
Fair Value Estimate Not Practicable Payable to Correspondent Brokers | 4,102 | 4,548
Securities failed to receive | 6,218 | 14,603
Other | 70 | 267,214
Total payables to brokers, dealers and clearing organizations | 259,889 | 520,708
Payables to customers | 502,807 | 334,735
Fair Value,Estimate not Practicable, Securities sold under Agreements to Repurchase | 342,438 | 287,265
Fair Value, Estimate not Practicable, Senior Secured Notes | 125,000 | $ 150,000
Fair Value Estimate Not Practicable Bank Call Loans | $ 82,000 |

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- Definition Amount, after the effects of master netting arrangements, of funds outstanding loaned in the form of a security resale agreement between the entity and another party for the purchase and resale of identical or substantially the same securities at a date certain for a specified price. Includes purchases of participations in pools of securities that are subject to a resale agreement, assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(m)(2)(i)(A)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(3)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=49176635&loc=d3e9760-107771 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 + Details
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