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Business Combinations - Additional Information (Details) - USD ($) $ in Thousands | Jul. 01, 2018 | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Goodwill |  | $ 290,366 | $ 290,366
Sustainable Growth Advisers, LP |  |  |
Business Acquisition [Line Items] |  |  |
Percentage of voting interests acquired | 70.00% |  |
Purchase price | $ 129,500 |  |
Goodwill | 120,213 |  |
Intangible assets | 62,000 |  |
Expected tax deductible amount of goodwill and other intangible assets | $ 127,500 |  |
Sustainable Growth Advisers, LP | SGIA, LLC | Sustainable Growth Advisers, LP |  |  |
Business Acquisition [Line Items] |  |  |
Percentage of membership interests | 100.00% |  |

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