Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Cash Flows from Operating Activities:
Net income	$ 90,983	$ 44,054
Adjustments to reconcile net income to net cash provided by/(used in) operating activities:
Depreciation and amortization	14,306	16,610
Amortization of loans and advances to financial advisors and other employees	32,580	31,004
Amortization of premium/(accretion of discount) on investment portfolio	3,118	1,568
Provision for loan losses and allowance for loans and advances to financial advisors and other employees	4,692	3,451
Amortization of intangible assets	8,204	2,827
Deferred income taxes	25,377	9,484
Excess tax benefits from stock-based compensation	(17,208)	(9,313)
Stock-based compensation	47,087	88,083
(Gains)/losses on investments	(4,945)	620
Other net	2,158	269
Decrease/(increase) in operating assets:
Cash segregated for regulatory purposes and restricted cash	4,265	127,997
Receivables:
Brokerage clients	(27,219)	(64,477)
Brokers, dealers and clearing organizations	(354,142)	(387,739)
Securities purchased under agreements to resell	2,866	33,472
Loans originated as held for sale	(490,705)	(836,888)
Proceeds from mortgages held for sale	472,609	890,865
Trading securities owned, including those pledged	(226,505)	142,728
Loans and advances to financial advisors and other employees	(37,632)	(31,974)
Other assets	(14,521)	(890)
Increase/(decrease) in operating liabilities, net of liabilities assumed:
Brokerage clients	4,769	(7,035)
Brokers, dealers and clearing organizations	46,634	37,147
Drafts	(6,161)	(33,582)
Financial instruments sold, but not yet purchased	204,129	110,235
Other liabilities and accrued expenses	(180,887)	(78,652)
Net cash provided by/(used in) operating activities	(396,148)	89,864
Cash Flows from Investing Activities:
Maturities, calls, sales, and principal paydowns of available-for-sale	245,570	307,424
Calls on held-to-maturity securities	46,240	31,418
Sale or maturity of investments	33,737	49,135
Sale of other real estate owned	131	200
Increase in bank loans, net	(357,654)	(167,216)
Payments for:
Purchase of available-for-sale securities	(132,703)	(1,017,693)
Purchase of held-to-maturity securities	(7,959)	(16,438)
Purchase of investments	(37,116)	(68,523)
Purchase of fixed assets	(12,107)	(13,305)
Acquisitions	(7,922)	(165,104)
Net cash used in investing activities	(229,783)	(1,060,102)
Cash Flows from Financing Activities:
Proceeds from short-term borrowings from banks	312,300	202,000
Increase/(decrease) in securities sold under agreements to repurchase	25,771	19,939
Increase in bank deposits, net	(9,667)	660,917
Increase in securities loaned	(15,003)	63,645
Excess tax benefits from stock-based compensation	17,208	9,313
Issuance of common stock for stock option exercises	114	15
Repurchase of common stock		(13,670)
Reissuance of treasury stock		509
Repayment of non-recourse debt		(5,968)
Extinguishment of subordinated debt	(3,131)	(2,187)
Net cash provided by financing activities	327,592	934,513
Effect of exchange rate changes on cash	2,069	(1,290)
Increase/(decrease) in cash and cash equivalents	(296,270)	(37,015)
Cash and cash equivalents at beginning of period	716,560	403,941
Cash and cash equivalents at end of period	420,290	366,926
Supplemental disclosure of cash flow information:
Cash paid for income taxes, net of refunds	31,594	8,635
Cash paid for interest	16,968	22,326
Noncash investing and financing activities:
Stock units granted, net of forfeitures	116,475	160,386
Issuance of common stock for acquisitions		$ 265,918