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Summary of Non-Vested Restricted Units Activity (Detail) - Restricted Stock Units - $ / shares
12 Months Ended 60 Months Ended 216 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2024
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Non-vested restricted shares/units, beginning balance 51,293 127,838 227,356    
Shares/Units issued 0 0 0 0 378,403
Shares/Units vested (51,293) (61,652) (47,633)    
Shares/Units forfeited 0 (14,893) (51,885)    
Non-vested restricted shares/units, ending balance 0 51,293 127,838 0  
Weighted Average Price Per Share          
Weighted average price per share, beginning balance $ 30.75 $ 30.53 $ 30.33    
Shares/Units issued 0 0 0    
Shares/Units vested 30.75 30.43 30.35    
Shares/Units forfeited 0 30.18 29.82    
Weighted average price per share, ending balance $ 0 $ 30.75 $ 30.53 $ 0