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Financial Assets and Liabilities - Measured on a Recurring Basis (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Assets
Financial instruments owned, at fair value	$ 2,211,819	$ 1,848,806
Financial instruments owned, at fair value, counterparty and cash collateral netting	(1,209,506)	(2,790,242)
Financial instruments owned and pledged	740,630	791,115
Other assets	49,046	48,273
Liabilities
Financial instruments sold, not yet purchased	2,294,625	2,475,395
Financial instruments sold, not yet purchased, at fair value, counterparty and cash collateral netting	(1,219,684)	(2,719,954)
Currency forwards
Assets
Financial instruments owned, at fair value	3,405	2,131
Financial instruments owned, at fair value, counterparty and cash collateral netting	(1,209,506)	(2,790,242)
Liabilities
Financial instruments sold, not yet purchased	0	795
Financial instruments sold, not yet purchased, at fair value, counterparty and cash collateral netting	(1,219,684)	(2,719,954)
Options
Assets
Financial instruments owned, at fair value	3,914	11,899
Liabilities
Financial instruments sold, not yet purchased	4,359	11,051
Equity securities
Assets
Financial instruments owned, at fair value	1,931,485	1,609,901
Financial instruments owned and pledged	697,090	748,846
Liabilities
Financial instruments sold, not yet purchased	2,087,833	2,268,330
U.S. and Non-U.S. government obligations
Assets
Financial instruments owned, at fair value	170,442
Financial instruments owned and pledged		0
Liabilities
Financial instruments sold, not yet purchased	70,198	115,112
U.S. and Non-U.S. government obligations
Assets
Financial instruments owned, at fair value		106,013
Corporate Bonds
Assets
Financial instruments owned, at fair value	82,412	87,500
Liabilities
Financial instruments sold, not yet purchased	99,587	40,123
Exchange traded notes
Assets
Financial instruments owned, at fair value	20,161	31,362
Financial instruments owned and pledged	43,540	42,269
Liabilities
Financial instruments sold, not yet purchased	32,648	39,984
Equity investment
Assets
Other assets	46,529	45,856
Exchange stock
Assets
Other assets	2,517	2,417
Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Financial instruments owned, at fair value	904,468	694,441
Financial instruments owned and pledged	376,729	396,778
Other assets	2,517	2,417
Liabilities
Financial instruments sold, not yet purchased	1,083,126	1,055,472
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	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Options
Assets
Financial instruments owned, at fair value	3,914	11,899
Liabilities
Financial instruments sold, not yet purchased	4,359	11,051
Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity securities
Assets
Financial instruments owned, at fair value	733,310	587,680
Financial instruments owned and pledged	376,711	389,810
Liabilities
Financial instruments sold, not yet purchased	1,005,560	931,992
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	152,884
Financial instruments owned and pledged		0
Liabilities
Financial instruments sold, not yet purchased	69,364	112,058
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		91,466
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	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Exchange traded notes
Assets
Financial instruments owned, at fair value	14,360	3,396
Financial instruments owned and pledged	18	6,968
Liabilities
Financial instruments sold, not yet purchased	3,843	371
Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity investment
Assets
Other assets	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Exchange stock
Assets
Other assets	2,517	2,417
Significant Other Observable Inputs (Level 2)
Assets
Financial instruments owned, at fair value	2,516,857	3,944,607
Financial instruments owned and pledged	363,901	394,337
Other assets	0	0
Liabilities
Financial instruments sold, not yet purchased	2,431,183	4,139,877
Significant Other Observable Inputs (Level 2) | Currency forwards
Assets
Financial instruments owned, at fair value	1,212,911	2,792,373
Liabilities
Financial instruments sold, not yet purchased	1,219,684	2,720,749
Significant Other Observable Inputs (Level 2) | Options
Assets
Financial instruments owned, at fair value	0	0
Liabilities
Financial instruments sold, not yet purchased	0	0
Significant Other Observable Inputs (Level 2) | Equity securities
Assets
Financial instruments owned, at fair value	1,198,175	1,022,221
Financial instruments owned and pledged	320,379	359,036
Liabilities
Financial instruments sold, not yet purchased	1,082,273	1,336,338
Significant Other Observable Inputs (Level 2) | U.S. and Non-U.S. government obligations
Assets
Financial instruments owned, at fair value	17,558
Financial instruments owned and pledged		0
Liabilities
Financial instruments sold, not yet purchased	834	3,054
Significant Other Observable Inputs (Level 2) | U.S. and Non-U.S. government obligations
Assets
Financial instruments owned, at fair value		14,547
Significant Other Observable Inputs (Level 2) | Corporate Bonds
Assets
Financial instruments owned, at fair value	82,412	87,500
Liabilities
Financial instruments sold, not yet purchased	99,587	40,123
Significant Other Observable Inputs (Level 2) | Exchange traded notes
Assets
Financial instruments owned, at fair value	5,801	27,966
Financial instruments owned and pledged	43,522	35,301
Liabilities
Financial instruments sold, not yet purchased	28,805	39,613
Significant Other Observable Inputs (Level 2) | Equity investment
Assets
Other assets	0	0
Significant Other Observable Inputs (Level 2) | Exchange stock
Assets
Other assets	0	0
Significant Unobservable Inputs (Level 3)
Assets
Financial instruments owned, at fair value	0	0
Financial instruments owned and pledged	0	0
Other assets	46,529	45,856
Liabilities
Financial instruments sold, not yet purchased	0	0
Significant Unobservable Inputs (Level 3) | Currency forwards
Assets
Financial instruments owned, at fair value	0	0
Liabilities
Financial instruments sold, not yet purchased	0	0
Significant Unobservable Inputs (Level 3) | Options
Assets
Financial instruments owned, at fair value	0	0
Liabilities
Financial instruments sold, not yet purchased	0	0
Significant Unobservable Inputs (Level 3) | Equity securities
Assets
Financial instruments owned, at fair value	0	0
Financial instruments owned and pledged	0	0
Liabilities
Financial instruments sold, not yet purchased	0	0
Significant Unobservable Inputs (Level 3) | U.S. and Non-U.S. government obligations
Assets
Financial instruments owned, at fair value	0
Financial instruments owned and pledged		0
Liabilities
Financial instruments sold, not yet purchased	0	0
Significant Unobservable Inputs (Level 3) | U.S. and Non-U.S. government obligations
Assets
Financial instruments owned, at fair value		0
Significant Unobservable Inputs (Level 3) | Corporate Bonds
Assets
Financial instruments owned, at fair value	0	0
Liabilities
Financial instruments sold, not yet purchased	0	0
Significant Unobservable Inputs (Level 3) | Exchange traded notes
Assets
Financial instruments owned, at fair value	0	0
Financial instruments owned and pledged	0	0
Liabilities
Financial instruments sold, not yet purchased	0	0
Significant Unobservable Inputs (Level 3) | Equity investment
Assets
Other assets	46,529	45,856
Significant Unobservable Inputs (Level 3) | Exchange stock
Assets
Other assets	$ 0	$ 0

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