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Company's Invested Assets and Derivative Instruments Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total invested assets $ 1,479,066 $ 1,459,486
Common Shares    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total invested assets 133,911 140,229
Fixed Maturities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total invested assets 1,262,996 1,241,437
Fixed Maturities | U.S. Treasury and Agency Obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total invested assets 98,129 104,680
Fixed Maturities | Obligations of States and Political Subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total invested assets 95,411 95,114
Fixed Maturities | Mortgage Backed Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total invested assets 173,785 149,350
Fixed Maturities | Commercial Mortgage-Backed Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total invested assets 147,841 139,795
Fixed Maturities | Asset-backed Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total invested assets 202,745 203,701
Fixed Maturities | Corporate Bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total invested assets 424,807 423,390
Fixed Maturities | Foreign Corporate Bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total invested assets 120,278 125,407
Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total invested assets 1,396,907 [1] 1,381,666 [2]
Total invested liabilities 3,168 7,968
Fair Value, Measurements, Recurring | Derivative instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total invested liabilities 3,168 7,968
Fair Value, Measurements, Recurring | Common Shares    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total invested assets 133,911 140,229
Fair Value, Measurements, Recurring | Fixed Maturities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total invested assets 1,262,996 1,241,437
Fair Value, Measurements, Recurring | Fixed Maturities | U.S. Treasury and Agency Obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total invested assets 98,129 104,680
Fair Value, Measurements, Recurring | Fixed Maturities | Obligations of States and Political Subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total invested assets 95,411 95,114
Fair Value, Measurements, Recurring | Fixed Maturities | Mortgage Backed Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total invested assets 173,785 149,350
Fair Value, Measurements, Recurring | Fixed Maturities | Commercial Mortgage-Backed Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total invested assets 147,841 139,795
Fair Value, Measurements, Recurring | Fixed Maturities | Asset-backed Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total invested assets 202,745 203,701
Fair Value, Measurements, Recurring | Fixed Maturities | Corporate Bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total invested assets 424,807 423,390
Fair Value, Measurements, Recurring | Fixed Maturities | Foreign Corporate Bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total invested assets 120,278 125,407
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total invested assets 232,040 [1] 244,909 [2]
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Common Shares    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total invested assets 133,911 140,229
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Fixed Maturities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total invested assets 98,129 104,680
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Fixed Maturities | U.S. Treasury and Agency Obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total invested assets 98,129 104,680
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total invested assets 1,164,867 [1] 1,136,757 [2]
Total invested liabilities 3,168 7,968
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Derivative instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total invested liabilities 3,168 7,968
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Fixed Maturities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total invested assets 1,164,867 1,136,757
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Fixed Maturities | Obligations of States and Political Subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total invested assets 95,411 95,114
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Fixed Maturities | Mortgage Backed Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total invested assets 173,785 149,350
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Fixed Maturities | Commercial Mortgage-Backed Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total invested assets 147,841 139,795
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Fixed Maturities | Asset-backed Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total invested assets 202,745 203,701
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Fixed Maturities | Corporate Bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total invested assets 424,807 423,390
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Fixed Maturities | Foreign Corporate Bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total invested assets $ 120,278 $ 125,407
[1] Excluded from the table above are limited partnerships of $82.2 million at March 31, 2018 whose fair value is based on net asset value as a practical expedient.
[2] Excluded from the table above are limited partnerships of $77.8 million at December 31, 2017 whose fair value is based on net asset value as a practical expedient.