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Shareholders' Equity - Additional Information (Detail) $ / shares in Units, $ in Thousands |  |  | 1 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
May 19, 2020 shares | May 15, 2020 USD ($) $ / shares shares | May 31, 2020 USD ($) shares | Sep. 30, 2020 USD ($) Vote shares | Dec. 31, 2019 shares
Class of Stock [Line Items] |  |  |  |  |
Preferred stock, issued (in shares) |  |  |  | 0 | 0
Preferred stock, outstanding (in shares) |  |  |  | 0 | 0
Value of capital stock issuance | $ |  |  |  | $ 411,523 |
Over-Allotment Option |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Shares issued and sold (in shares) | 800,000 |  |  |  |
Class A Common Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Common stock holders voting right | Vote |  |  |  | 1 |
Conversion of common stock conversion ratio |  |  |  | 1 |
Class B Common Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Common stock holders voting right | Vote |  |  |  | 10 |
Class C Capital Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Shares issued and sold (in shares) |  | 8,000,000 |  |  |
Shares issued (in shares) |  | 753,936 |  |  |
Shares issued (usd per share) | $ / shares |  | $ 48.00 |  |  |
Value of capital stock issuance | $ |  | $ 36,200 |  |  |
Shares received in unwinding of capped call transactions (in shares) |  | 317,865 | 317,865 |  |
Value based on trading price of Class C capital stock at time of unwind | $ |  | $ 14,800 | $ 14,800 |  |
Class C Capital Stock | Public Stock Offering |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Shares issued and sold (in shares) |  | 8,800,000 |  |  |
Public offering price (usd per share) | $ / shares |  | $ 48.00 |  |  |
Net proceeds from public offering | $ |  | $ 411,500 |  |  |

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