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Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2019 | Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 307,216 | $ 308,616 | $ 255,993 | $ 263,852 | $ 278,312 | $ 278,315 | $ 272,796 | $ 273,501 | $ 1,135,677 | $ 1,102,924 | $ 1,143,371 |  |
Other Service Fees, net—Affiliates |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 156,935 | 176,397 | 160,024 |  |
Investment Advisory Fees, net—Affiliates |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 585,832 | 591,112 | 654,224 |  |
Investment Advisory Fees, net—Other |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 187,586 | $ 140,558 | $ 112,601 |  |
Accounting Standards Update 2014-09 | Other Service Fees, net—Affiliates |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 1,500 |  |  |  |
Accounting Standards Update 2014-09 | Investment Advisory Fees, net—Affiliates |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | (34,300) |  |  |  |
Accounting Standards Update 2014-09 | Investment Advisory Fees, net—Other |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 6,300 |  |  |  |
Accounting Standards Update 2014-09 | Retained Earnings |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative-effect adjustment |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,100
Cumulative-effect adjustment |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,000
Subsequent Event | Accounting Standards Update 2016-02 |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Right-of-use asset |  |  |  |  |  |  |  |  |  |  |  | $ 112,000 |
Lease liability |  |  |  |  |  |  |  |  |  |  |  | $ 134,000 |

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