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Restructuring - Additional Information (Detail) - USD ($)
 3 Months Ended 12 Months Ended 18 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Mar. 31, 2024
Restructuring Cost and Reserve [Line Items]        
Restructuring, description The Company restructured its insurance operations to strengthen its market presence and enhance its focus on GBLI’s core products. As a result, the Company exited its four brokerage divisions: Professional Liability, Excess Casualty, Environmental, and Middle Market Property. The Company ceased writing new business and non-renewed existing policies for these four divisions. The restructuring plan, which was initiated in the fourth quarter of 2022, was completed in the first quarter of 2023.      
Restructuring, initiation date Dec. 31, 2022      
Restructuring, completion date Mar. 31, 2023      
Restructuring cost $ 0 $ 2,000,000 $ 3,400,000 $ 5,400,000
Maximum        
Restructuring Cost and Reserve [Line Items]        
Liability related restructuring plan   $ 100,000