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Fair Value Measurements - Assets Measured for at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities $ 416,083 $ 353,949
Equity securities 42,214 19,642
Short-term investments 25,021 49,990
Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 25,021 37,490
Total assets accounted for at fair value 483,318 411,081
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 125,342 120,038
Fair Value, Measurements, Recurring | Corporate Bonds [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities 125,517 119,832
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 150,160 107,223
Fair Value, Measurements, Recurring | Redeemable Preferred Stock [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities 10,065 6,856
Fair Value, Measurements, Recurring | Other [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities 4,999  
Fair Value, Measurements, Recurring | Common Stock [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities 10,762 270
Fair Value, Measurements, Recurring | Mutual Funds [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities 31,452 19,372
Fair Value, Measurements, Recurring | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets accounted for at fair value 42,214 19,642
Fair Value, Measurements, Recurring | Level 1 [Member] | Common Stock [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities 10,762 270
Fair Value, Measurements, Recurring | Level 1 [Member] | Mutual Funds [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities 31,452 19,372
Fair Value, Measurements, Recurring | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 25,021 37,490
Total assets accounted for at fair value 441,104 391,439
Fair Value, Measurements, Recurring | Level 2 [Member] | U.S. Government Obligations and Agencies [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities 125,342 120,038
Fair Value, Measurements, Recurring | Level 2 [Member] | Corporate Bonds [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities 125,517 119,832
Fair Value, Measurements, Recurring | Level 2 [Member] | Mortgage-Backed and Asset-Backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities 150,160 107,223
Fair Value, Measurements, Recurring | Level 2 [Member] | Redeemable Preferred Stock [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities 10,065 $ 6,856
Fair Value, Measurements, Recurring | Level 2 [Member] | Other [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities $ 4,999