Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash Flows From Operating Activities:
Net income	$ 63,985	$ 90,983
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization	14,899	14,306
Amortization of loans and advances to financial advisors and other employees	28,692	32,580
Amortization of premium on investment portfolio	2,222	3,118
Provision for loan losses and allowance for loans and advances to financial advisors and other employees	4,393	4,692
Amortization of intangible assets	3,673	8,204
Deferred income taxes	16,797	25,377
Excess tax benefits from stock-based compensation	(12,454)	(17,208)
Stock-based compensation	81,160	47,087
Gains on sale of investments	(4,941)	(4,945)
Other, net	(7,012)	2,158
Decrease/(increase) in operating assets, net of assets acquired:
Cash segregated for regulatory purposes and restricted cash	49,496	4,265
Receivables:
Brokerage clients	(160,766)	(27,219)
Brokers, dealers, and clearing organizations	(150,642)	(354,142)
Securities purchased under agreements to resell	(187,866)	2,866
Financial instruments owned, including those pledged	(100,353)	(226,505)
Loans originated as held for sale	(969,064)	(490,705)
Proceeds from mortgages held for sale	904,798	472,609
Loans and advances to financial advisors and other employees	(48,472)	(37,632)
Other assets	(27,769)	(14,521)
Increase/(decrease) in operating liabilities, net of liabilities assumed:
Brokerage clients	128,338	4,769
Brokers, dealers, and clearing organizations	57,487	46,634
Drafts	(15,619)	(6,161)
Financial instruments sold, but not yet purchased	(20,539)	204,129
Other liabilities and accrued expenses	(222,792)	(180,887)
Net cash used in operating activities	(572,349)	(396,148)
Cash Flows From Investing Activities:
Maturities, calls, sales, and principal paydowns of available-for-sale securities	728,809	245,570
Calls and principal paydowns of held-to-maturity securities	52,903	46,240
Sale or maturity of investments	50,912	33,737
Sale of other real estate owned		131
Increase in bank loans, net	(356,580)	(357,654)
Payments for:
Purchase of available-for-sale securities	(199)	(132,703)
Purchase of held-to-maturity securities		(7,959)
Purchase of investments	(30,283)	(37,116)
Purchase of fixed assets	(32,309)	(12,107)
Acquisitions, net of cash acquired	18,456	(7,922)
Net cash provided by/(used in) investing activities	431,709	(229,783)
Cash Flows From Financing Activities:
Proceeds from short-term borrowings from banks	327,568	312,300
Increase in securities sold under agreements to repurchase	303,170	25,771
Decrease in bank deposits, net	(476,144)	(9,667)
Increase/(decrease) in securities loaned	99,446	(15,003)
Excess tax benefits from stock-based compensation	12,454	17,208
Issuance of common stock for stock option exercises	245	114
Repayment of senior notes	(175,000)
Extinguishment of subordinated debt		(3,131)
Net cash provided by financing activities	91,739	327,592
Effect of exchange rate changes on cash	1,056	2,069
Decrease in cash and cash equivalents	(47,845)	(296,270)
Cash and cash equivalents at beginning of period	689,782	716,560
Cash and cash equivalents at end of period	641,937	420,290
Supplemental disclosure of cash flow information:
Cash paid for interest	20,073	16,968
Cash paid for income taxes, net of refunds	31,951	31,594
Noncash financing activities:
Unit grants, net of forfeitures	105,448	$ 116,475
Shares surrendered into treasury	223
Issuance of common stock for acquisitions	$ 80,981