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Shareholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2017 | Sep. 30, 2025 | Dec. 31, 2024 | Dec. 14, 2022 | Jul. 07, 2015
Class B Non Economic Common Shares [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Common shares, issued |  | 0 |  |  |
Common shares, outstanding |  | 0 |  |  |
Class A Common Shares [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Common shares, par value |  | $ 0.01 | $ 0.01 |  | $ 0.01
Common shares, issued |  | 56,324,607 | 56,274,466 |  |
Common shares, outstanding |  | 56,324,607 | 56,274,466 |  |
Series A Cumulative Redeemable Preferred Shares [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred shares, issued | 2,800,000 |  |  |  |
Percentage of preferred dividend rate | 7.00% |  |  |  |
Preferred shares public offering price per share | $ 25.00 |  |  |  |
Net proceeds from public offering | $ 66.4 |  |  |  |
Preferred shares redemption price per share plus any accrued and unpaid dividends |  |  |  | $ 25.00 |

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