Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Net cash flows from operating activities:
Net income (loss)	$ (218,602)	$ 374,429
Adjustments to reconcile net income (loss) to net cash used for operations:
Deferred income tax provision (benefit)	(81,521)	214,612
Depreciation and amortization	35,167	40,328
Share-based compensation	6,933	32,794
Provision for doubtful accounts	11,003	3,636
Net securities gains	(728)	(15,089)
(Income) loss related to associated companies	3,364	(61,140)
Distributions from associated companies	13,908	39,703
Net (gains) losses related to property and equipment, and other assets	5,874	(659)
Net change in:
Cash and securities segregated and on deposit for regulatory purposes or deposited with clearing and depository organizations	70,939	257,319
Trading assets	3,041,330	(1,095,937)
Investments in managed funds	49,350	(312,111)
Securities borrowed	(385,463)	285,891
Securities purchased under agreements to resell	298,260	179,290
Receivables from brokers, dealers and clearing organizations	(204,142)	(38,561)
Receivables from customers of securities operations	6,966	(94,841)
Other receivables	(22,889)	(28,557)
Other assets	(370,398)	(124,643)
Trading liabilities	761,729	(966,190)
Securities loaned	(295,559)	575,750
Securities sold under agreements to repurchase	(1,721,276)	654,705
Payables to brokers, dealers and clearing organizations	(1,492,311)	384,163
Payables to customers of securities operations	(180,980)	(1,481,640)
Trade payables, expense accruals and other liabilities	(262,392)	(487,782)
Other	8,645	(62,857)
Net cash used for operating activities	(922,793)	(1,727,387)
Net cash flows from investing activities:
Acquisitions of property, equipment and leasehold improvements, and other assets	(90,722)	(62,821)
Proceeds from disposals of property and equipment, and other assets	5,298	3,103
Advances on notes, loans and other receivables	(148,622)	(283,000)
Collections on notes, loans and other receivables	11,686	21,836
Loans to and investments in associated companies	(284,820)	(607,025)
Capital distributions and loan repayments from associated companies	193,952	560,043
Purchases of investments (other than short-term)	(295,088)	(400,484)
Proceeds from maturities of investments	18,358	139,988
Proceeds from sales of investments	83,460	897,246
Other	(5,959)	(966)
Net cash provided by (used for) investing activities	(512,457)	267,920
Net cash flows from financing activities:
Issuance of debt, net of issuance costs	262,249	127,486
Change in short-term borrowings	1,226	399,998
Reduction of debt	(34,937)	(15,448)
Net proceeds from other secured financings	119,794	245,251
Issuance of common shares	531	616
Distributions to noncontrolling interests	(271)	0
Contributions from noncontrolling interests	94,904	533
Purchase of common shares for treasury	(9,624)	(27,010)
Dividends paid	(23,001)	(23,359)
Other	153	246
Net cash provided by financing activities	411,024	708,313
Effect of foreign exchange rate changes on cash	(10,356)	(1,097)
Net decrease in cash and cash equivalents	(1,034,582)	(752,251)
Cash and cash equivalents at January 1,	3,638,648	4,276,775
Cash and cash equivalents at March 31,	2,604,066	3,524,524
Supplemental disclosures of cash flow information:
Interest	195,300	204,769
Income tax payments (refunds), net	$ (8,596)	$ 828