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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 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted Average Number of Shares Outstanding, Basic 16,865 16,849 16,849 16,788
Weighted Average Number of Shares Outstanding, Diluted 16,958 17,078 17,003 17,080
Anti-dilutive shares excluded from calculation 500 400 400 400
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 91 105 152 171
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 2 125 2 120