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Company's Invested Assets and Derivative Instruments Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total invested assets | $ 1,689,106 | $ 1,439,186
Common Shares |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total invested assets | 106,666 | 122,048
Other Invested Assets |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total invested assets | 33,555 | 33,663
Fixed Maturities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total invested assets | 1,548,885 | 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 | 97,275 | 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 | 235,400 | 191,473
Fixed Maturities | Mortgage Backed Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total invested assets | 188,403 | 208,759
Fixed Maturities | Commercial Mortgage-Backed Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total invested assets | 160,076 | 133,158
Fixed Maturities | Asset-backed Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total invested assets | 278,834 | 178,263
Fixed Maturities | Corporate bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total invested assets | 461,294 | 383,416
Fixed Maturities | Foreign Corporate Bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total invested assets | 127,603 | 107,639
Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total invested assets | 1,689,106 | 1,439,186
Total invested liabilities | 18,522 | 13,675
Fair Value, Measurements, Recurring | Derivative instruments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total invested liabilities | 18,522 | 13,675
Fair Value, Measurements, Recurring | Common Shares |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total invested assets | 106,666 | 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 | 33,555 | 33,663
Fair Value, Measurements, Recurring | Fixed Maturities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total invested assets | 1,548,885 | 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 | 97,275 | 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 | 235,400 | 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 | 188,403 | 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 | 160,076 | 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 | 278,834 | 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 | 461,294 | 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 | 127,603 | 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 | 198,007 | 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 | 106,666 | 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 | 91,341 | 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 | 91,341 | 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 | 1,457,544 | 1,208,710
Total invested liabilities | 18,522 | 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 | 18,522 | 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 | 1,457,544 | 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 | 5,934 | 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 | 235,400 | 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 | 188,403 | 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 | 160,076 | 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 | 278,834 | 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 | 461,294 | 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 | 127,603 | 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 | 33,555 | 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 | $ 33,555 | $ 33,663

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