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Liability for Unpaid Losses and Loss Adjustment Expenses - Summary of Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Detail)
$ in Thousands
Dec. 31, 2017
USD ($)
Claim
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Claims Development [Line Items]          
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 988,139        
Accident Year 2013 [Member]          
Claims Development [Line Items]          
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 91,065 $ 88,493 $ 96,012 $ 96,993 $ 100,111
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development (Redundancy) on Reported Claims $ (4,704)        
Cumulative Number of Reported Claims | Claim 20,440        
Accident Year 2014 [Member]          
Claims Development [Line Items]          
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 112,278 112,251 118,289 $ 111,739  
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development (Redundancy) on Reported Claims $ (10,886)        
Cumulative Number of Reported Claims | Claim 22,420        
Accident Year 2015 [Member]          
Claims Development [Line Items]          
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 194,600 187,431 $ 170,381    
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development (Redundancy) on Reported Claims $ (15,635)        
Cumulative Number of Reported Claims | Claim 26,703        
Accident Year 2016 [Member]          
Claims Development [Line Items]          
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 286,252 $ 269,814      
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development (Redundancy) on Reported Claims $ (17,785)        
Cumulative Number of Reported Claims | Claim 39,885        
Accident Year 2017 [Member]          
Claims Development [Line Items]          
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 303,944        
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development (Redundancy) on Reported Claims $ 49,600        
Cumulative Number of Reported Claims | Claim 93,080