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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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