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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
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