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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

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