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Earnings per Common Share - Reconciliation of Number of Common Shares Used in Calculating Basic and Diluted Net Earnings Per Share (Detail) - shares shares in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted Average Number of Shares Outstanding, Basic | 16,620 | 16,682 | 16,629 | 16,800
Weighted Average Number of Shares Outstanding, Diluted | 16,620 | 16,895 | 16,629 | 17,051
Anti-dilutive shares excluded from calculation | 300 | 300 | 300 | 400
Restricted Stock Units (RSUs) [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements | 0 | 120 | 0 | 139
Performance Shares [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements | 0 | 94 | 0 | 112

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- Definition Line items represent financial concepts included in a table. 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