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Stockholders' equity (Detail) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 $ / shares shares | Dec. 31, 2023 $ / shares shares | Dec. 31, 2022 USD ($) item $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Purchase of common shares |  |  | 78,900
Acquired | 0 | 0 | (78,900)
Shares available for purchase | 523,647 |  |
Common Stock Dividend declared by directors | $ / shares | $ 0.30 | $ 0.25 | $ 0.25
Special cash dividends per share | $ / shares | $ 2 |  | $ 1.75
Shares Repurchased in Market Transaction |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Purchase of common shares |  |  | 70,000
Shares Repurchased from Affiliates |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Purchase of common shares |  |  | 8,900
Number of affiliates | item |  |  | 2
Number of private transactions | item |  |  | 2
Class A Common Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Purchase of common shares |  |  | 78,900
Purchase of common shares value | $ |  |  | $ 1.7
Class A Common Stock | Non-Employee | 2013 Director Stock Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Common stock shares authorized to be issued under the plan | 200,000 |  |
Shares available for award | 119,650 |  |

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