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Investments - Summary of Amortized Cost, Gross Unrealized Gains and Losses, and Estimated Fair Value Available-for-Sale Securities (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 48,994 $ 42,192
Gross Unrealized Gain 2,076 2,831
Gross Unrealized Loss (616) (194)
Debt securities 40,119 35,953
Equity securities 10,335 8,876
Total available-for-sale securities 50,454 44,829
Fixed-Maturity Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 38,838 33,436
Gross Unrealized Gain 1,510 2,528
Gross Unrealized Loss (229) (11)
Debt securities 40,119 35,953
Fixed-Maturity Securities [Member] | U.S. Treasury and U.S. Government Agencies [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 1,671 1,359
Gross Unrealized Gain 45 88
Gross Unrealized Loss (3)  
Debt securities 1,713 1,447
Fixed-Maturity Securities [Member] | Corporate Bonds [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 15,017 10,298
Gross Unrealized Gain 375 572
Gross Unrealized Loss (86) (10)
Debt securities 15,306 10,860
Fixed-Maturity Securities [Member] | Commercial Mortgage-Backed Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 11,133 10,708
Gross Unrealized Gain 589 936
Gross Unrealized Loss (82)  
Debt securities 11,640 11,644
Fixed-Maturity Securities [Member] | State, Municipalities, and Political Subdivisions [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 10,251 10,152
Gross Unrealized Gain 489 914
Gross Unrealized Loss (56)  
Debt securities 10,684 11,066
Fixed-Maturity Securities [Member] | Redeemable Preferred Stock [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 766 919
Gross Unrealized Gain 12 18
Gross Unrealized Loss (2) (1)
Debt securities 776 936
Equity Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 10,156 8,756
Gross Unrealized Gain 566 303
Gross Unrealized Loss (387) (183)
Equity securities $ 10,335 $ 8,876