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Collateralized Transactions - Narrative (Details) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2017 USD ($) broker-dealer | Dec. 31, 2016 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Securities purchased under agreements to resell, fair value | $ 3,617 | $ 24,006
Fair Value Of Securities Repurchase Agreement | 0 |
U.S. Treasury and agency securities |  | 378,084
Bank call loans | 230,400 | 145,800
Customer securities under customer margin loans available to be pledged | 1,200,000 |
Customer securities under customer margin loans agreement available to be repledged | 114,800 |
Customer securities deposited to secure obligations and margin requirements under option contracts | 235,800 |
Amounts pledged | 644,359 | 438,385
Carrying value of securities owned by the Company loaned or pledged | $ 168,100 | 138,600
Receivable from brokers and clearing organizations, number of major broker-dealers | broker-dealer | 3 |
Receivable from brokers and clearing organizations | $ 79,400 |
Securities Loaned, Gross |  | 179,875
Minimum [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Settlement with Financial Institution, Period to Complete Transactions | 1 day |
Maximum [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Settlement with Financial Institution, Period to Complete Transactions | 3 days |
Securities Borrowed [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Securities received as collateral under securities borrowed transaction with market value | $ 153,300 | 148,700
Reverse Repurchase Agreement [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Securities received as collateral under securities borrowed transaction with market value | 133,200 | 24,000
Securities Loaned [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Customer securities under customer margin loans agreement available to be repledged | 20,900 | 37,400
Repurchase Agreements [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Customer securities under customer margin loans agreement available to be repledged | 133,200 | $ 24,000
Corporate [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Collateralized loans, collateralized by firm | 168,100 |
Other Than Corporate Customer [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Collateralized loans, collateralized by customer securities | 242,300 |
Maturity Overnight and Open [Member] | US Treasury and Government [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
U.S. Treasury and agency securities | $ 586,507 |

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