Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Net cash flows from operating activities:
Net income	$ 374,429	$ 91,937
Adjustments to reconcile net income to net cash used for operations:
Deferred income tax provision	214,612	39,754
Depreciation and amortization of property, equipment and leasehold improvements	37,262	29,336
Other amortization	3,066	(265)
Share-based compensation	32,794	38,207
Provision for doubtful accounts	3,636	2,752
Net securities gains	(15,089)	(5,394)
Income related to associated companies	(61,140)	(40,663)
Distributions from associated companies	39,703	20,912
Net gains related to property and equipment, and other assets	(659)	(1,177)
Net change in:
Cash and securities segregated and on deposit for regulatory purposes or deposited with clearing and depository organizations	257,319	(183,710)
Trading assets	(1,095,937)	(1,968,227)
Investments in managed funds	(312,111)	(4,978)
Securities borrowed	285,891	(756,481)
Securities purchased under agreements to resell	179,290	(694,175)
Receivables from brokers, dealers and clearing organizations	(38,561)	(478,066)
Receivables from customers of securities operations	(94,841)	(227,813)
Other receivables	(28,557)	(72,241)
Other assets	(124,643)	(149,111)
Trading liabilities	(966,190)	2,282,870
Securities loaned	575,750	572,285
Securities sold under agreements to repurchase	654,705	(10,772)
Payables to brokers, dealers and clearing organizations	384,163	287,356
Payables to customers of securities operations	(1,481,640)	488,178
Trade payables, expense accruals and other liabilities	(487,782)	(294,047)
Other	(62,857)	(946)
Net cash used for operating activities	(1,727,387)	(1,034,479)
Net cash flows from investing activities:
Acquisitions of property, equipment and leasehold improvements, and other assets	(62,821)	(75,057)
Proceeds from disposals of property and equipment, and other assets	3,103	2,681
Acquisitions, net of cash acquired		(10,178)
Cash paid and cash of real estate operations sold to HomeFed Corporation		(18,100)
Advances on notes and other receivables	(283,000)
Collections on notes, loans and other receivables	21,836	4,432
Loans to and investments in associated companies	(607,025)	(794,498)
Capital distributions and loan repayment from associated companies	560,043	780,503
Deconsolidation of asset management entities		(207,965)
Purchases of investments (other than short-term)	(400,484)	(402,451)
Proceeds from maturities of investments	139,988	282,760
Proceeds from sales of investments	897,246	1,007,243
Other	(966)	(1,883)
Net cash provided by investing activities	267,920	567,487
Net cash flows from financing activities:
Issuance of debt, net of issuance costs	127,486	192,690
Change in short-term borrowings	399,998
Reduction of debt	(15,448)	(21,930)
Net proceeds from other secured financings	245,251	35,683
Issuance of common shares	616	592
Distributions to noncontrolling interests		(778)
Contributions from noncontrolling interests	533	8,604
Purchase of common shares for treasury	(27,010)	(46,710)
Dividends paid	(23,359)	(23,186)
Other	246	953
Net cash provided by financing activities	708,313	145,918
Effect of foreign exchange rate changes on cash	(1,097)	4,006
Net decrease in cash and cash equivalents	(752,251)	(317,068)
Cash and cash equivalents at January 1, including cash classified as assets of discontinued operations	4,276,775	3,907,595
Cash and cash equivalents at March 31, including cash classified as assets of discontinued operations	3,524,524	3,590,527
Supplemental disclosures of cash flow information:
Interest	204,769	266,179
Income tax payments (refunds), net	$ 828	$ (1,359)