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Fair Value Measurements - Assets and Liabilities Not Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Financial Instruments, Estimate Not Practicable, Fair Value [Line Items] |  |
Securities purchased under agreements to resell, at fair value | $ 1,502 | $ 658
Securities Owned and Sold, Not yet Purchased, at Fair Value, Security Owned, Including Disposal Group Securities Owned | 895,251 | 926,597
Fair Value, Measurements, Nonrecurring [Member] |  |
Financial Instruments, Estimate Not Practicable, Fair Value [Line Items] |  |
Other | 5,183 | 930
Receivable from customers | 797,751 | 848,226
Fair Value, Estimate Not Practicable, Investment | 68,585 | 65,404
Drafts payable | 29,242 | 42,212
Clearing organizations | 29,026 | 24,361
Securities loaned | 197,332 | 180,270
Fair Value, Estimate not Practicable, Due from Employees | 43,278 | 40,520
Total Receivable from brokers, dealers and clearing organizations | 203,790 | 186,399
Securities failed to receive | 18,102 | 17,559
Fair Value Estimate Not Practicable Payable to Correspondent Brokers | 2,004 | 1,567
Bank call loans | 3,000 | 118,300
Securities purchased under agreements to resell, at fair value | 1,502 | 658
Receivables from brokers | 31,396 | 19,298
Securities failed to deliver | 23,390 | 9,442
Securities borrowed | 114,795 | 132,368
Deposits with clearing organization | 22,665 | 7,929
Other | 106 | 10,707
Total payables to brokers, dealers and clearing organizations | 217,544 | 210,103
Payables to customers | 351,750 | 385,907
Fair Value,Estimate not Practicable, Securities sold under Agreements to Repurchase | 606,010 | 586,478
Fair Value, Estimate not Practicable, Senior Secured Notes | 202,938 | 206,380
Fair Value, Estimate Not Practicable, Cash | 27,031 | 37,664
Fair Value, Measurements, Nonrecurring [Member] | Carrying Value [Member] |  |
Financial Instruments, Estimate Not Practicable, Fair Value [Line Items] |  |
Other | 5,183 | 930
Receivable from customers | 797,751 | 848,226
Fair Value, Estimate Not Practicable, Investment | 68,585 | 65,404
Drafts payable | 29,242 | 42,212
Clearing organizations | 29,026 | 24,361
Securities loaned | 197,332 | 180,270
Fair Value, Estimate not Practicable, Due from Employees | 43,278 | 40,520
Total Receivable from brokers, dealers and clearing organizations | 203,790 | 186,399
Securities failed to receive | 18,102 | 17,559
Fair Value Estimate Not Practicable Payable to Correspondent Brokers | 2,004 | 1,567
Bank call loans | 3,000 | 118,300
Securities purchased under agreements to resell, at fair value | 1,502 | 658
Receivables from brokers | 31,396 | 19,298
Securities failed to deliver | 23,390 | 9,442
Securities borrowed | 114,795 | 132,368
Deposits with clearing organization | 22,665 | 7,929
Other | 106 | 10,707
Total payables to brokers, dealers and clearing organizations | 217,544 | 210,103
Payables to customers | 351,750 | 385,907
Fair Value,Estimate not Practicable, Securities sold under Agreements to Repurchase | 606,010 | 586,478
Fair Value, Estimate not Practicable, Senior Secured Notes | 200,000 | 200,000
Fair Value, Estimate Not Practicable, Cash | 27,031 | 37,664
Fair Value, Measurements, Nonrecurring [Member] | Level 1 |  |
Financial Instruments, Estimate Not Practicable, Fair Value [Line Items] |  |
Drafts payable | 29,242 | 42,212
Deposits with clearing organization | 22,665 | 7,929
Fair Value, Estimate Not Practicable, Cash | 27,031 | 37,664
Fair Value, Measurements, Nonrecurring [Member] | Level 2 |  |
Financial Instruments, Estimate Not Practicable, Fair Value [Line Items] |  |
Other | 5,183 | 930
Receivable from customers | 797,751 | 848,226
Fair Value, Estimate Not Practicable, Investment | 68,585 | 65,404
Clearing organizations | 29,026 | 24,361
Securities loaned | 197,332 | 180,270
Fair Value, Estimate not Practicable, Due from Employees | 43,278 | 40,520
Total Receivable from brokers, dealers and clearing organizations | 203,790 | 186,399
Securities failed to receive | 18,102 | 17,559
Fair Value Estimate Not Practicable Payable to Correspondent Brokers | 2,004 | 1,567
Bank call loans | 3,000 | 118,300
Securities purchased under agreements to resell, at fair value | 1,502 | 658
Receivables from brokers | 31,396 | 19,298
Securities failed to deliver | 23,390 | 9,442
Securities borrowed | 114,795 | 132,368
Other | 106 | 10,707
Total payables to brokers, dealers and clearing organizations | 217,544 | 210,103
Payables to customers | 351,750 | 385,907
Fair Value,Estimate not Practicable, Securities sold under Agreements to Repurchase | 606,010 | 586,478
Fair Value, Estimate not Practicable, Senior Secured Notes | $ 202,938 | $ 206,380

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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 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(m)(2)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: 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 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=6876686&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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