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Liability for Unpaid Losses and Loss Adjustment Expenses - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Claims Development [Line Items]        
Unpaid losses and loss adjustment expenses $ (205,069,000) $ 224,404,000 $ 189,931,000  
Unpaid losses and loss adjustment expenses 267,760,000 472,829,000 248,425,000 $ 58,494,000
Policy holder benefits and claims incurred, ceded 481,198,000 910,868,000 428,694,000  
Policyholder benefits and claims incurred, net 603,406,000 414,455,000 350,428,000  
Prior year claims and claims adjustment expense 88,068,000 99,522,000 $ 27,499,000  
Prior years adverse reserve development incurred, net $ 47,400,000      
Insurance claim maximum settlement time 1 year      
Initial case reserve for claims $ 2,500      
LAE case reserves 0      
Subrogation [Member]        
Claims Development [Line Items]        
Salvage and subrogation receivables 73,000,000 $ 99,000,000    
Decrease In salvage and subrogation recoveries, value 40,700,000      
Hurricane [Member]        
Claims Development [Line Items]        
Policy holder benefits and claims incurred, ceded 469,900,000      
Policyholder benefits and claims incurred, net $ 4,500,000