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Restructuring - Additional Information (Detail) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended 24 Months Ended
Sep. 30, 2024
Sep. 30, 2024
Dec. 31, 2023
Dec. 31, 2022
Sep. 30, 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 $ 0 $ 2,000,000 $ 3,400,000 $ 5,400,000
Maximum          
Restructuring Cost and Reserve [Line Items]          
Liability related restructuring plan     $ 100,000