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Fair Value Measurements - Assets and Liabilities Not Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Financial Instruments Not Measured at Fair Value on Recurring Basis [Line items] |  |
Securities Owned and Sold, Not yet Purchased, at Fair Value, Security Owned, Including Disposal Group Securities Owned |  | $ 710,668
Fair value of the reverse repurchase agreements |  | 24,006
Securities purchased under agreements to resell | $ 658 | 24,006
Fair Value, Measurements, Nonrecurring [Member] |  |
Financial Instruments Not Measured at Fair Value on Recurring Basis [Line items] |  |
Cash | 37,664 | 48,671
Fair Value Estimate Not Practicable Cash And Securities Segregated Under Federal And Other Regulations | 0 |
Deposits with clearing organization | 7,929 | 11,748
Securities borrowed | 132,368 | 154,090
Receivables from brokers | 19,298 | 25,768
Securities failed to deliver | 9,442 | 6,172
Clearing organizations | 24,361 | 26,081
Other | 930 | 2,823
Total Receivable from brokers, dealers and clearing organizations | 186,399 | 214,934
Receivable from customers | 848,226 | 847,386
Securities purchased under agreements to resell | 658 |
Fair Value, Estimate Not Practicable, Notes Receivable | 40,520 | 30,099
Drafts payable | 42,412 | 39,228
Bank call loans | 118,300 | 145,800
Securities loaned | 180,270 | 179,875
Fair Value Estimate Not Practicable Payable to Correspondent Brokers | 1,567 | 610
Securities failed to receive | 17,559 | 11,523
Other | 10,707 | 29,381
Total payables to brokers, dealers and clearing organizations | 210,103 | 221,389
Payables to customers | 385,907 | 449,946
Securities sold under agreements to repurchase | 586,478 | 378,084
Senior secured notes | 206,380 | 151,782
Fair Value, Estimate Not Practicable, Investments | 65,404 | 56,300
Level 1 |  |
Financial Instruments Not Measured at Fair Value on Recurring Basis [Line items] |  |
Securities Owned and Sold, Not yet Purchased, at Fair Value, Security Owned, Including Disposal Group Securities Owned |  | 456,129
Level 1 | Fair Value, Measurements, Nonrecurring [Member] |  |
Financial Instruments Not Measured at Fair Value on Recurring Basis [Line items] |  |
Cash | 37,664 | 48,671
Fair Value Estimate Not Practicable Cash And Securities Segregated Under Federal And Other Regulations | 0 |
Deposits with clearing organization | 7,929 | 11,748
Drafts payable | 42,412 | 39,228
Level 2 |  |
Financial Instruments Not Measured at Fair Value on Recurring Basis [Line items] |  |
Securities Owned and Sold, Not yet Purchased, at Fair Value, Security Owned, Including Disposal Group Securities Owned |  | 169,569
Fair value of the reverse repurchase agreements |  | 24,006
Level 2 | Fair Value, Measurements, Nonrecurring [Member] |  |
Financial Instruments Not Measured at Fair Value on Recurring Basis [Line items] |  |
Securities borrowed | 132,368 | 154,090
Receivables from brokers | 19,298 | 25,768
Securities failed to deliver | 9,442 | 6,172
Clearing organizations | 24,361 | 26,081
Other | 930 | 2,823
Total Receivable from brokers, dealers and clearing organizations | 186,399 | 214,934
Receivable from customers | 848,226 | 847,386
Securities purchased under agreements to resell | 658 |
Fair Value, Estimate Not Practicable, Notes Receivable | 40,520 | 30,099
Bank call loans | 118,300 | 145,800
Securities loaned | 180,270 | 179,875
Fair Value Estimate Not Practicable Payable to Correspondent Brokers | 1,567 | 610
Securities failed to receive | 17,559 | 11,523
Other | 10,707 | 29,381
Total payables to brokers, dealers and clearing organizations | 210,103 | 221,389
Payables to customers | 385,907 | 449,946
Securities sold under agreements to repurchase | 586,478 | 378,084
Senior secured notes | 206,380 | 151,782
Fair Value, Estimate Not Practicable, Investments | 65,404 | 56,300
Level 3 |  |
Financial Instruments Not Measured at Fair Value on Recurring Basis [Line items] |  |
Securities Owned and Sold, Not yet Purchased, at Fair Value, Security Owned, Including Disposal Group Securities Owned |  | 84,970
Carrying Value | Fair Value, Measurements, Nonrecurring [Member] |  |
Financial Instruments Not Measured at Fair Value on Recurring Basis [Line items] |  |
Cash | 37,664 | 48,671
Fair Value Estimate Not Practicable Cash And Securities Segregated Under Federal And Other Regulations | 0 |
Deposits with clearing organization | 7,929 | 11,748
Securities borrowed | 132,368 | 154,090
Receivables from brokers | 19,298 | 25,768
Securities failed to deliver | 9,442 | 6,172
Clearing organizations | 24,361 | 26,081
Other | 930 | 2,823
Total Receivable from brokers, dealers and clearing organizations | 186,399 | 214,934
Receivable from customers | 848,226 | 847,386
Securities purchased under agreements to resell | 658 |
Fair Value, Estimate Not Practicable, Notes Receivable | 40,520 | 30,099
Drafts payable | 42,412 | 39,228
Bank call loans | 118,300 | 145,800
Securities loaned | 180,270 | 179,875
Fair Value Estimate Not Practicable Payable to Correspondent Brokers | 1,567 | 610
Securities failed to receive | 17,559 | 11,523
Other | 10,707 | 29,381
Total payables to brokers, dealers and clearing organizations | 210,103 | 221,389
Payables to customers | 385,907 | 449,946
Securities sold under agreements to repurchase | 586,478 | 378,084
Senior secured notes | 200,000 | 150,000
Fair Value, Estimate Not Practicable, Investments | $ 65,404 | $ 56,300

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