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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Cash flows from operating activities:    
Net income $ 361,952 $ 195,324
Adjustments to reconcile net income to net cash provided by operating activities:    
Deferred income taxes 8,447 9,350
Depreciation and amortization 9,451 9,439
Employee stock plan compensation 21,601 24,181
Losses (gains) on other investments, net 3,509 (636)
Bad debt expense 1,013 1,343
Change in operating assets and liabilities:    
Increase in cash and securities - segregated for regulatory purposes (1,526,993) (230,065)
Increase in securities borrowed (747,740) (433,869)
Decrease (increase) in securities purchased under agreements to resell 111,995 (158,665)
Decrease in financial instruments owned 1,210,691 132,064
Increase in receivables from customers (1,731,306) (1,460,788)
Decrease (increase) in other receivables 86,715 (105,839)
Increase in other assets (10,902) (23,000)
Decrease in financial instruments sold but not yet purchased (522,888) (245,110)
Increase in securities loaned 368,751 629,029
Increase in payable to customers 2,091,682 1,532,913
Increase (decrease) in other payables 60,248 (47,984)
Net cash used in operating activities (203,774) (172,313)
Cash flows from investing activities:    
Purchases of other investments (74,073) (126,870)
Proceeds from sales of other investments 298,060 159,838
Distributions received from and redemptions of equity investments 1,074 11,054
Purchase of property and equipment (9,544) (7,946)
Net cash provided by investing activities 215,517 36,076
Cash flows from financing activities:    
Dividends paid to stockholders (11,176) (9,745)
Distributions to noncontrolling interests (203,502) (70,406)
Decrease in short-term borrowings, net (9,442) (97,594)
Payments made under the Tax Receivable Agreement (15,752)  
Net cash used in financing activities (239,872) (177,745)
Effect of exchange rate changes on cash and cash equivalents 14,518 (62,961)
Net decrease in cash and cash equivalents (213,611) (376,943)
Cash and cash equivalents at beginning of period 1,213,241 1,380,599
Cash and cash equivalents at end of period 999,630 1,003,656
Supplemental disclosures of cash flow information:    
Cash paid for interest 24,890 28,816
Cash paid for taxes 20,826 36,973
Non-cash financing activities:    
Adjustments to additional paid-in capital for changes in proportionate ownership in IBG LLC 27,132 19,826
Adjustments to noncontrolling interests for changes in proportionate ownership in IBG LLC $ (27,132) $ (19,826)