Net Capital and Minimum Capital Requirements - Additional Information (Details) - USD ($) $ in Thousands |
Dec. 31, 2021 |
Dec. 31, 2020 |
|---|---|---|
| AssetMark Trust Company | ||
| Net Capital And Minimum Capital Requirements [Line Items] | ||
| Liquid capital | $ 12,375 | $ 9,375 |
| AssetMark Brokerage, LLC | ||
| Net Capital And Minimum Capital Requirements [Line Items] | ||
| Net capital | $ 5 | $ 5 |