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Summary Of Significant Accounting Policies (Adjustments To Reconcile Net Income To Net Cash Provided By Operating Activities) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Accounting Policies [Abstract]        
Net income $ 67,195 $ 51,086 $ 222,959 $ 151,060
Depreciation 5,616 5,761 17,050 16,823
Amortization 8,829 10,384 25,498 25,413
Equity in earnings of unconsolidated affiliates (31,028) (24,928) (86,204) (74,970)
Distributions received from unconsolidated affiliate     109,173 72,306
Stock-based compensation 11,097 3,879 26,997 11,777
Provision for losses on receivables     (180) (112)
Deferred income tax expense     (21,443) 2,117
Gain on sale of SEI AK (See Note 13) 0 0 (22,112) 0
Net gain from investments     (638) (7,577)
Change in other long-term liabilities     1,671 2,803
Change in other assets     80 (1,063)
Other     (4,199) 4,759
Decrease (increase) in restricted cash for broker-dealer operations     500 0
Decrease (increase) in receivables from regulated investment companies     (8,495) (3,203)
Decrease (increase) in receivables     (17,255) (54,995)
Decrease (increase) in other current assets     (1,208) (863)
Increase (decrease) in Accounts payable     (3,960) 1,568
Increase (decrease) in Accrued liabilities     3,149 967
Increase (decrease) in Deferred revenue     (1,088) (911)
Total adjustments     17,336 (5,161)
Net cash provided by operating activities     $ 240,295 $ 145,899