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Summary of Non-Vested Book Value Rights (Detail) - shares
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
BVR issued 200,000 140,000 300,000
Non-Vested Book Value Rights      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Non vested book value rights, beginning balance 126,438 0  
BVR issued 179,096 131,438  
BVR vested (17,006) 0  
BVR forfeited (59,505) (5,000)  
Non vested book value rights, ending balance 229,023 126,438 0