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Investments - Summary of Amortized Cost, Gross Unrealized Gains and Losses, and Estimated Fair Value of Available-for-Sale Securities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Fixed-maturity securities, Cost or Amortized Cost $ 165,995 $ 96,163
Equity securities, Cost or Amortized Cost 59,557 45,387
Total available-for-sale securities, Cost or Amortized Cost 225,552 141,550
Total available-for-sale securities, Gross Unrealized Gain 1,048 1,454
Total available-for-sale securities, Gross Unrealized Gain 2,327 1,694
Total available-for-sale securities, Gross Unrealized Gain 3,375 3,148
Total Available-for-sale securities, Gross Unrealized Loss (1,608) (533)
Total Available-for-sale securities, Gross Unrealized Loss (1,553) (1,531)
Total Available-for-sale securities, Gross Unrealized Loss (3,161) (2,064)
Total available-for-sale securities, Estimated Fair Value 165,435 97,084
Equity securities, Estimated Fair Value 60,331 45,550
Total available-for-sale securities, Estimated Fair Value 225,766 142,634
Fixed-Maturity Securities [Member] | U.S. Treasury and U.S. Government Agencies [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Fixed-maturity securities, Cost or Amortized Cost 10,918 2,881
Total available-for-sale securities, Gross Unrealized Gain 18 5
Total Available-for-sale securities, Gross Unrealized Loss (9) (8)
Total available-for-sale securities, Estimated Fair Value 10,927 2,878
Fixed-Maturity Securities [Member] | Corporate Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Fixed-maturity securities, Cost or Amortized Cost 43,118 23,645
Total available-for-sale securities, Gross Unrealized Gain 94 57
Total Available-for-sale securities, Gross Unrealized Loss (807) (430)
Total available-for-sale securities, Estimated Fair Value 42,405 23,272
Fixed-Maturity Securities [Member] | Asset-backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Fixed-maturity securities, Cost or Amortized Cost 4,162 697
Total available-for-sale securities, Gross Unrealized Gain 4  
Total Available-for-sale securities, Gross Unrealized Loss (3)  
Total available-for-sale securities, Estimated Fair Value 4,163 697
Fixed-Maturity Securities [Member] | Mortgage-Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Fixed-maturity securities, Cost or Amortized Cost 14,528 3,004
Total available-for-sale securities, Gross Unrealized Gain 5 8
Total Available-for-sale securities, Gross Unrealized Loss (95) (3)
Total available-for-sale securities, Estimated Fair Value 14,438 3,009
Fixed-Maturity Securities [Member] | State, Municipalities, and Political Subdivisions [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Fixed-maturity securities, Cost or Amortized Cost 82,489 56,336
Total available-for-sale securities, Gross Unrealized Gain 705 1,205
Total Available-for-sale securities, Gross Unrealized Loss (657) (38)
Total available-for-sale securities, Estimated Fair Value 82,537 57,503
Fixed-Maturity Securities [Member] | Redeemable Preferred Stock [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Fixed-maturity securities, Cost or Amortized Cost 10,283 9,433
Total available-for-sale securities, Gross Unrealized Gain 221 178
Total Available-for-sale securities, Gross Unrealized Loss (37) (54)
Total available-for-sale securities, Estimated Fair Value 10,467 9,557
Fixed-Maturity Securities [Member] | Other [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Fixed-maturity securities, Cost or Amortized Cost 497 167
Total available-for-sale securities, Gross Unrealized Gain 1 1
Total available-for-sale securities, Estimated Fair Value $ 498 $ 168