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Fair Value Measurements - Assets Measured for at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturities | $ 639,334 | $ 584,361
Equity securities | 62,215 | 50,803
Short-term investments | 10,000 | 5,002
Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments | 10,000 | 5,002
Total assets accounted for at fair value | 711,549 | 640,166
Fair Value, Measurements, Recurring | U.S. Government Obligations and Agencies [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturities | 59,604 | 74,267
Fair Value, Measurements, Recurring | Corporate Bonds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturities | 227,504 | 191,430
Fair Value, Measurements, Recurring | Mortgage-Backed and Asset-Backed Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturities | 219,452 | 214,776
Fair Value, Measurements, Recurring | Municipal Bonds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturities | 120,295 | 91,197
Fair Value, Measurements, Recurring | Redeemable Preferred Stock [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturities | 12,479 | 12,691
Fair Value, Measurements, Recurring | Common Stock [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 18,811 | 93
Fair Value, Measurements, Recurring | Mutual Funds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 43,404 | 50,710
Level 1 [Member] | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total assets accounted for at fair value | 62,215 | 50,803
Level 1 [Member] | Fair Value, Measurements, Recurring | Common Stock [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 18,811 | 93
Level 1 [Member] | Fair Value, Measurements, Recurring | Mutual Funds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 43,404 | 50,710
Level 2 [Member] | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments | 10,000 | 5,002
Total assets accounted for at fair value | 649,334 | 589,363
Level 2 [Member] | Fair Value, Measurements, Recurring | U.S. Government Obligations and Agencies [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturities | 59,604 | 74,267
Level 2 [Member] | Fair Value, Measurements, Recurring | Corporate Bonds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturities | 227,504 | 191,430
Level 2 [Member] | Fair Value, Measurements, Recurring | Mortgage-Backed and Asset-Backed Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturities | 219,452 | 214,776
Level 2 [Member] | Fair Value, Measurements, Recurring | Municipal Bonds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturities | 120,295 | 91,197
Level 2 [Member] | Fair Value, Measurements, Recurring | Redeemable Preferred Stock [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturities | $ 12,479 | $ 12,691

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