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Financial Assets and Liabilities - Level 3 financial instruments (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017
Fair value measurements measured on a recurring basis |  |  |
Transfers of financial assets between levels | $ 0 |  | $ 0
Assets |  |  |
Financial instruments owned, at fair value | 2,297,070,000 | $ 2,117,579,000 |
Financial instruments owned, pledged as collateral | 610,536,000 | 595,043,000 |
Other assets | 100,811,000 | 98,364,000 |
Liabilities |  |  |
Financial instruments sold, not yet purchased, at fair value | 2,846,453,000 | 2,384,598,000 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Beginning Balance | 40,588,000 | 36,031,000 |
Purchases | 0 | 3,000,000 |
Total Realized and Unrealized Gains / (Losses) | 1,890,000 | 4,557,000 |
Net Transfers into (out of) Level 3 | 0 | 0 |
Settlement | 0 | (3,000,000) |
Ending Balance | 42,478,000 | 40,588,000 |
Change in Net Unrealized Gains / (Losses) On Investments Held | 1,890,000 | 4,557,000 |
Equities |  |  |
Assets |  |  |
Financial instruments owned, pledged as collateral | 571,997,000 | 586,251,000 |
U.S. and Non-U.S. government obligations |  |  |
Assets |  |  |
Financial instruments owned, pledged as collateral | 200,000 | 99,000 |
Exchange traded notes |  |  |
Assets |  |  |
Financial instruments owned, pledged as collateral | 38,339,000 | 8,693,000 |
Equity investment |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Beginning Balance | 40,588,000 | 36,031,000 |
Purchases | 0 | 0 |
Total Realized and Unrealized Gains / (Losses) | 1,890,000 | 4,557,000 |
Net Transfers into (out of) Level 3 | 0 | 0 |
Settlement | 0 | 0 |
Ending Balance | 42,478,000 | 40,588,000 |
Change in Net Unrealized Gains / (Losses) On Investments Held | 1,890,000 | 4,557,000 |
Other |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Beginning Balance | 0 | 0 |
Purchases |  | 3,000,000 |
Total Realized and Unrealized Gains / (Losses) |  | 0 |
Net Transfers into (out of) Level 3 |  | 0 |
Settlement |  | (3,000,000) |
Ending Balance |  | 0 |
Change in Net Unrealized Gains / (Losses) On Investments Held |  | 0 |
Fair value measurements measured on a recurring basis | Fair Value |  |  |
Assets |  |  |
Financial instruments owned, at fair value | 2,297,070,000 | 2,117,579,000 |
Financial instruments owned, pledged as collateral | 610,536,000 | 595,043,000 |
Other assets | 100,811,000 | 98,364,000 |
Liabilities |  |  |
Financial instruments sold, not yet purchased, at fair value | 2,846,453,000 | 2,384,598,000 |
Fair value measurements measured on a recurring basis | Fair Value | Currency forwards |  |  |
Assets |  |  |
Financial instruments owned, at fair value | 2,234,000 | 17,790,000 |
Liabilities |  |  |
Financial instruments sold, not yet purchased, at fair value | 4,958,000 | 7,026,000 |
Fair value measurements measured on a recurring basis | Fair Value | Options |  |  |
Assets |  |  |
Financial instruments owned, at fair value | 9,210,000 | 7,045,000 |
Liabilities |  |  |
Financial instruments sold, not yet purchased, at fair value | 15,548,000 | 5,839,000 |
Fair value measurements measured on a recurring basis | Fair Value | Equities |  |  |
Assets |  |  |
Financial instruments owned, at fair value | 2,095,987,000 | 1,926,591,000 |
Financial instruments owned, pledged as collateral | 571,997,000 | 586,251,000 |
Liabilities |  |  |
Financial instruments sold, not yet purchased, at fair value | 2,716,628,000 | 2,203,432,000 |
Fair value measurements measured on a recurring basis | Fair Value | U.S. and Non-U.S. government obligations |  |  |
Assets |  |  |
Financial instruments owned, at fair value | 19,007,000 | 22,783,000 |
Financial instruments owned, pledged as collateral | 200,000 | 99,000 |
Liabilities |  |  |
Financial instruments sold, not yet purchased, at fair value | 27,205,000 |  |
Fair value measurements measured on a recurring basis | Fair Value | Corporate Bonds |  |  |
Assets |  |  |
Financial instruments owned, at fair value | 75,534,000 | 60,975,000 |
Liabilities |  |  |
Financial instruments sold, not yet purchased, at fair value | 40,007,000 |  |
Fair value measurements measured on a recurring basis | Fair Value | Exchange traded notes |  |  |
Assets |  |  |
Financial instruments owned, at fair value | 95,098,000 | 82,395,000 |
Financial instruments owned, pledged as collateral | 38,339,000 | 8,693,000 |
Liabilities |  |  |
Financial instruments sold, not yet purchased, at fair value | 42,107,000 | 55,762,000 |
Fair value measurements measured on a recurring basis | Fair Value | Exchange stock |  |  |
Assets |  |  |
Other assets | 2,154,000 | 1,952,000 |
Fair value measurements measured on a recurring basis | Fair Value | Equity investment |  |  |
Assets |  |  |
Other assets | 42,478,000 | 40,588,000 |
Fair value measurements measured on a recurring basis | Fair Value | Other |  |  |
Assets |  |  |
Other assets | 56,179,000 | 55,824,000 |
Fair value measurements measured on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Assets |  |  |
Financial instruments owned, at fair value | 1,031,258,000 | 785,185,000 |
Financial instruments owned, pledged as collateral | 331,931,000 | 410,851,000 |
Other assets | 2,154,000 | 1,952,000 |
Liabilities |  |  |
Financial instruments sold, not yet purchased, at fair value | 1,645,535,000 | 874,109,000 |
Fair value measurements measured on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Currency forwards |  |  |
Assets |  |  |
Financial instruments owned, at fair value | 0 | 0 |
Liabilities |  |  |
Financial instruments sold, not yet purchased, at fair value | 0 | 0 |
Fair value measurements measured on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Options |  |  |
Assets |  |  |
Financial instruments owned, at fair value | 9,210,000 | 7,045,000 |
Liabilities |  |  |
Financial instruments sold, not yet purchased, at fair value | 15,548,000 | 5,839,000 |
Fair value measurements measured on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Equities |  |  |
Assets |  |  |
Financial instruments owned, at fair value | 956,518,000 | 758,596,000 |
Financial instruments owned, pledged as collateral | 309,313,000 | 410,670,000 |
Liabilities |  |  |
Financial instruments sold, not yet purchased, at fair value | 1,584,268,000 | 847,816,000 |
Fair value measurements measured on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. and Non-U.S. government obligations |  |  |
Assets |  |  |
Financial instruments owned, at fair value | 800,000 | 5,968,000 |
Financial instruments owned, pledged as collateral | 200,000 | 99,000 |
Liabilities |  |  |
Financial instruments sold, not yet purchased, at fair value | 1,998,000 |  |
Fair value measurements measured on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate Bonds |  |  |
Assets |  |  |
Financial instruments owned, at fair value | 0 | 0 |
Liabilities |  |  |
Financial instruments sold, not yet purchased, at fair value | 40,007,000 |  |
Fair value measurements measured on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Exchange traded notes |  |  |
Assets |  |  |
Financial instruments owned, at fair value | 64,730,000 | 13,576,000 |
Financial instruments owned, pledged as collateral | 22,418,000 | 82,000 |
Liabilities |  |  |
Financial instruments sold, not yet purchased, at fair value | 3,714,000 | 1,514,000 |
Fair value measurements measured on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Exchange stock |  |  |
Assets |  |  |
Other assets | 2,154,000 | 1,952,000 |
Fair value measurements measured on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity investment |  |  |
Assets |  |  |
Other assets | 0 | 0 |
Fair value measurements measured on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other |  |  |
Assets |  |  |
Other assets | 0 | 0 |
Fair value measurements measured on a recurring basis | Significant Other Observable Inputs (Level 2) |  |  |
Assets |  |  |
Financial instruments owned, at fair value | 1,966,467,000 | 3,360,091,000 |
Financial instruments owned, at fair value, counterparty and cash collateral netting | (700,655,000) | (2,027,697,000) |
Financial instruments owned, pledged as collateral | 278,605,000 | 184,192,000 |
Other assets | 56,179,000 | 55,824,000 |
Liabilities |  |  |
Financial instruments sold, not yet purchased, at fair value | 1,921,382,000 | 3,535,480,000 |
Financial instruments sold, not yet purchased, at fair value, counterparty and cash collateral netting | (720,464,000) | (2,024,991,000) |
Fair value measurements measured on a recurring basis | Significant Other Observable Inputs (Level 2) | Currency forwards |  |  |
Assets |  |  |
Financial instruments owned, at fair value | 702,889,000 | 2,045,487,000 |
Financial instruments owned, at fair value, counterparty and cash collateral netting | (700,655,000) | (2,027,697,000) |
Liabilities |  |  |
Financial instruments sold, not yet purchased, at fair value | 725,422,000 | 2,032,017,000 |
Financial instruments sold, not yet purchased, at fair value, counterparty and cash collateral netting | (720,464,000) | (2,024,991,000) |
Fair value measurements measured on a recurring basis | Significant Other Observable Inputs (Level 2) | Options |  |  |
Assets |  |  |
Financial instruments owned, at fair value | 0 | 0 |
Liabilities |  |  |
Financial instruments sold, not yet purchased, at fair value | 0 | 0 |
Fair value measurements measured on a recurring basis | Significant Other Observable Inputs (Level 2) | Equities |  |  |
Assets |  |  |
Financial instruments owned, at fair value | 1,139,469,000 | 1,167,995,000 |
Financial instruments owned, pledged as collateral | 262,684,000 | 175,581,000 |
Liabilities |  |  |
Financial instruments sold, not yet purchased, at fair value | 1,132,360,000 | 1,355,616,000 |
Fair value measurements measured on a recurring basis | Significant Other Observable Inputs (Level 2) | U.S. and Non-U.S. government obligations |  |  |
Assets |  |  |
Financial instruments owned, at fair value | 18,207,000 | 16,815,000 |
Financial instruments owned, pledged as collateral | 0 | 0 |
Liabilities |  |  |
Financial instruments sold, not yet purchased, at fair value | 25,207,000 |  |
Fair value measurements measured on a recurring basis | Significant Other Observable Inputs (Level 2) | Corporate Bonds |  |  |
Assets |  |  |
Financial instruments owned, at fair value | 75,534,000 | 60,975,000 |
Liabilities |  |  |
Financial instruments sold, not yet purchased, at fair value | 0 |  |
Fair value measurements measured on a recurring basis | Significant Other Observable Inputs (Level 2) | Exchange traded notes |  |  |
Assets |  |  |
Financial instruments owned, at fair value | 30,368,000 | 68,819,000 |
Financial instruments owned, pledged as collateral | 15,921,000 | 8,611,000 |
Liabilities |  |  |
Financial instruments sold, not yet purchased, at fair value | 38,393,000 | 54,248,000 |
Fair value measurements measured on a recurring basis | Significant Other Observable Inputs (Level 2) | Exchange stock |  |  |
Assets |  |  |
Other assets | 0 | 0 |
Fair value measurements measured on a recurring basis | Significant Other Observable Inputs (Level 2) | Equity investment |  |  |
Assets |  |  |
Other assets | 0 | 0 |
Fair value measurements measured on a recurring basis | Significant Other Observable Inputs (Level 2) | Other |  |  |
Assets |  |  |
Other assets | 56,179,000 | 55,824,000 |
Fair value measurements measured on a recurring basis | Significant Unobservable Inputs (Level 3) |  |  |
Assets |  |  |
Financial instruments owned, at fair value | 0 | 0 |
Financial instruments owned, pledged as collateral | 0 | 0 |
Other assets | 42,478,000 | 40,588,000 |
Liabilities |  |  |
Financial instruments sold, not yet purchased, at fair value | 0 | 0 |
Fair value measurements measured on a recurring basis | Significant Unobservable Inputs (Level 3) | Currency forwards |  |  |
Assets |  |  |
Financial instruments owned, at fair value | 0 | 0 |
Liabilities |  |  |
Financial instruments sold, not yet purchased, at fair value | 0 | 0 |
Fair value measurements measured on a recurring basis | Significant Unobservable Inputs (Level 3) | Options |  |  |
Assets |  |  |
Financial instruments owned, at fair value | 0 | 0 |
Liabilities |  |  |
Financial instruments sold, not yet purchased, at fair value | 0 | 0 |
Fair value measurements measured on a recurring basis | Significant Unobservable Inputs (Level 3) | Equities |  |  |
Assets |  |  |
Financial instruments owned, at fair value | 0 | 0 |
Financial instruments owned, pledged as collateral | 0 | 0 |
Liabilities |  |  |
Financial instruments sold, not yet purchased, at fair value | 0 | 0 |
Fair value measurements measured on a recurring basis | Significant Unobservable Inputs (Level 3) | U.S. and Non-U.S. government obligations |  |  |
Assets |  |  |
Financial instruments owned, at fair value | 0 | 0 |
Financial instruments owned, pledged as collateral | 0 | 0 |
Liabilities |  |  |
Financial instruments sold, not yet purchased, at fair value | 0 |  |
Fair value measurements measured on a recurring basis | Significant Unobservable Inputs (Level 3) | Corporate Bonds |  |  |
Assets |  |  |
Financial instruments owned, at fair value | 0 | 0 |
Liabilities |  |  |
Financial instruments sold, not yet purchased, at fair value | 0 |  |
Fair value measurements measured on a recurring basis | Significant Unobservable Inputs (Level 3) | Exchange traded notes |  |  |
Assets |  |  |
Financial instruments owned, at fair value | 0 | 0 |
Financial instruments owned, pledged as collateral | 0 | 0 |
Liabilities |  |  |
Financial instruments sold, not yet purchased, at fair value | 0 | 0 |
Fair value measurements measured on a recurring basis | Significant Unobservable Inputs (Level 3) | Exchange stock |  |  |
Assets |  |  |
Other assets | 0 | 0 |
Fair value measurements measured on a recurring basis | Significant Unobservable Inputs (Level 3) | Equity investment |  |  |
Assets |  |  |
Other assets | 42,478,000 | 40,588,000 |
Fair value measurements measured on a recurring basis | Significant Unobservable Inputs (Level 3) | Other |  |  |
Assets |  |  |
Other assets | $ 0 | $ 0 |

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