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Composition of Certain Financial Statement Captions (Accrued Liabilities) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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Items Included in Consolidated Statement of Financial Condition [Abstract] |  |
Accrued employee compensation | $ 69,256 | $ 63,996
Accrued employee benefits and other personnel | 9,647 | 7,299
Accrued consulting, outsourcing and professional fees | 19,311 | 16,676
Accrued brokerage fees | 5,251 | 5,733
Accrued sub-advisory, distribution and other asset management fees | 25,018 | 17,548
Accrued dividend payable | 37,314 | 0
Other accrued liabilities | 22,326 | 27,053
Total accrued liabilities | $ 188,123 | $ 138,305

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