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Description of Business and Basis of Presentation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  | 6 Months Ended
--- | --- | ---
Sep. 16, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Subsidiary, Sale of Stock [Line Items] |  |  |
Deferred offering costs |  | $ 0 | $ 1,946
Common Class A |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |
Proceeds from initial public offer | $ 410,800 |  |
IPO | Common Class A |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |
Common stock new issue shares (in shares) | 11,500,000 |  |
IPO offer price per share (in dollars per share) | $ 39.00 |  |
Deferred offering costs | $ 37,700 |  |
IPO | Common Class A | Underwriter Offer |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |
Common stock new issue shares (in shares) | 1,500,000 |  |

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