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Company's Invested Assets and Derivative Instruments Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total invested assets $ 1,703,036 $ 1,439,186
Common Shares    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total invested assets 121,238 122,048
Other Invested Assets    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total invested assets 31,176 33,663
Fixed Maturities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total invested assets 1,550,622 1,283,475
Fixed Maturities | U.S. Treasury and Agency Obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total invested assets 90,256 80,767
Fixed Maturities | Obligations of States and Political Subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total invested assets 232,532 191,473
Fixed Maturities | Mortgage Backed Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total invested assets 203,980 208,759
Fixed Maturities | Commercial Mortgage-Backed Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total invested assets 170,968 133,158
Fixed Maturities | Asset-backed Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total invested assets 258,171 178,263
Fixed Maturities | Corporate bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total invested assets 455,848 383,416
Fixed Maturities | Foreign Corporate Bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total invested assets 138,867 107,639
Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total invested assets 1,703,036 1,439,186
Total invested liabilities 11,801 13,675
Fair Value, Measurements, Recurring | Derivative instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total invested liabilities 11,801 13,675
Fair Value, Measurements, Recurring | Common Shares    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total invested assets 121,238 122,048
Fair Value, Measurements, Recurring | Other Invested Assets    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total invested assets 31,176 33,663
Fair Value, Measurements, Recurring | Fixed Maturities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total invested assets 1,550,622 1,283,475
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 90,256 80,767
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 232,532 191,473
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 203,980 208,759
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 170,968 133,158
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 258,171 178,263
Fair Value, Measurements, Recurring | Fixed Maturities | Corporate bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total invested assets 455,848 383,416
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 138,867 107,639
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 201,494 196,813
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 121,238 122,048
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 80,256 74,765
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 80,256 74,765
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 1,470,366 1,208,710
Total invested liabilities 11,801 13,675
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 11,801 13,675
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 1,470,366 1,208,710
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Fixed Maturities | U.S. Treasury and Agency Obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total invested assets 10,000 6,002
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 232,532 191,473
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 203,980 208,759
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 170,968 133,158
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 258,171 178,263
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 455,848 383,416
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 138,867 107,639
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total invested assets 31,176 33,663
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Other Invested Assets    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total invested assets $ 31,176 $ 33,663