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Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Revenue | $ 308,616 | $ 278,315 | $ 828,461 | $ 824,612 |
Other Long-Term Assets | Accounting Standards Update 2014-09 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cumulative-effect adjustment, shorter amortization period |  |  |  |  | $ 8,100
Cumulative-effect adjustment, revenue |  |  |  |  | (8,000)
Retained Earnings | Accounting Standards Update 2014-09 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cumulative-effect adjustment, shorter amortization period |  |  |  |  | (8,100)
Cumulative-effect adjustment, revenue |  |  |  |  | $ 8,000
Other Service Fees, net—Affiliates |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Revenue | 39,046 | 44,539 | 119,105 | 134,911 |
Other Service Fees, net—Affiliates | Accounting Standards Update 2014-09 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Revenue | 400 |  | 1,200 |  |
Investment Advisory Fees, net—Affiliates |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Revenue | 159,527 | 149,412 | 425,288 | 442,536 |
Investment Advisory Fees, net—Affiliates | Accounting Standards Update 2014-09 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Revenue | (8,700) |  | (25,600) |  |
Investment Advisory Fees, net—Other |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Revenue | 57,509 | $ 35,474 | 134,141 | $ 102,989 |
Investment Advisory Fees, net—Other | Accounting Standards Update 2014-09 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Revenue | $ 1,500 |  | $ 4,800 |  |

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