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At-the-Market Equity Offerings - Additional Information (Detail) - Class A - USD ($) $ / shares in Units, $ in Millions |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 09, 2022 | Jun. 14, 2021 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021
At Market Equity Offerings [Line Items] |  |  |  |  |  |
Common stock, shares issued |  |  |  | 18,038,000 |  | 18,006,000
Jefferies LLC | 2021 Open Market Offering |  |  |  |  |  |
At Market Equity Offerings [Line Items] |  |  |  |  |  |
Cumulative aggregate offering price of shares sold under the agreement |  | $ 1,000.0 |  |  |  |
Maximum commission percentage on stock sales |  | 2.00% |  |  |  |
2021 Open Market Offering | Jefferies LLC |  |  |  |  |  |
At Market Equity Offerings [Line Items] |  |  |  |  |  |
Cumulative aggregate offering price of shares sold under the agreement |  |  |  |  |  | $ 1,000.0
Common stock, shares issued |  |  | 555,179 |  | 555,179 |
Common stock, average price per share |  |  | $ 727.64 |  | $ 727.64 |
Sales commissions and expenses |  |  | $ 4.5 |  | $ 4.5 |
Proceeds from sale of class A common stock under public offerings |  |  | $ 399.5 |  | $ 399.5 |
Sales Agents | 2022 Sales Agreement |  |  |  |  |  |
At Market Equity Offerings [Line Items] |  |  |  |  |  |
Maximum commission percentage on stock sales | 2.00% |  |  |  |  |
Common stock, shares issued |  |  |  | 0 |  |
Sales commissions and expenses |  |  |  | $ 0.4 |  |
Aggregate offering | $ 500.0 |  |  |  |  |

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