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Non-controlling interests - Additional Information (Detail) - shares | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2023 | Dec. 31, 2022 | Jun. 30, 2023 | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021
FAH, LLC |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |
Ownership percentage | 91.70% | 91.60% |  |  |  |
Class A common shares outstanding |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |
Common stock, shares outstanding (in shares) | 48,727,000 | 47,192,000 | 47,497,000 | 47,095,000 | 46,832,000 | 40,088,000
Class A common shares outstanding | FAH, LLC |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |
Common stock, shares outstanding (in shares) | 48,700,000 | 47,200,000 |  |  |  |

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