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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
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Accounting Policies [Abstract]        
Net income $ 79,425 $ 83,983 $ 250,276 $ 241,616
Depreciation 6,108 5,579 17,946 16,494
Amortization 10,837 9,813 31,806 28,611
Equity in earnings of unconsolidated affiliates (33,595) (37,963) (104,917) (104,080)
Distributions received from unconsolidated affiliate     116,913 103,592
Stock-based compensation 3,867 3,786 11,476 9,481
Provision for losses on receivables     (196) 387
Deferred income tax expense     (4,942) 4,768
Gain on sale of SEI AK $ 0 $ 0 (2,791) (5,582)
Net gain from investments     544 (49)
Change in other long-term liabilities     1,926 2,663
Change in other assets     (706) (2,769)
Write off of capitalized and purchased software     6,055 0
Other     (2,364) (1,242)
Decrease (increase) in Receivables from regulated investment companies     2,601 (7,169)
Decrease (increase) in Receivables     (23,081) (24,951)
Decrease (increase) in Other current assets     (11,013) (4,862)
Increase (decrease) in Accounts payable     (5,950) (9,723)
Increase (decrease) in Accrued liabilities     (11,808) (1,988)
Increase (decrease) in Deferred revenue     2,708 (879)
Total adjustments     24,207 2,702
Net cash provided by operating activities     $ 274,483 $ 244,318