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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 | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed-maturity securities, Cost or Amortized Cost | $ 167,223 | $ 128,614
Equity securities, Cost or Amortized Cost | 46,323 | 47,548
Total available-for-sale securities, Cost or Amortized Cost | 213,546 | 176,162
Total available-for-sale securities, Gross Unrealized Gain | 4,246 | 1,896
Total available-for-sale securities, Gross Unrealized Gain | 5,487 | 2,139
Total available-for-sale securities, Gross Unrealized Gain | 9,733 | 4,035
Total available-for-sale securities, Gross Unrealized Loss | (1,453) | (5,501)
Total available-for-sale securities, Gross Unrealized Loss | (350) | (1,450)
Total available-for-sale securities, Gross Unrealized Loss | (1,803) | (6,951)
Fixed-maturity securities, Estimated Fair Value | 170,016 | 125,009
Equity securities, Estimated Fair Value | 51,460 | 48,237
Total available-for-sale securities, Estimated Fair Value | 221,476 | 173,246
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 | 430 | 108
Total available-for-sale securities, Gross Unrealized Gain | 10 | 5
Fixed-maturity securities, Estimated Fair Value | 440 | 113
Fixed-Maturity Securities [Member] | Corporate Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed-maturity securities, Cost or Amortized Cost | 77,432 | 42,560
Total available-for-sale securities, Gross Unrealized Gain | 1,007 | 74
Total available-for-sale securities, Gross Unrealized Loss | (1,191) | (4,815)
Fixed-maturity securities, Estimated Fair Value | 77,248 | 37,819
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 | 77,040 | 75,812
Total available-for-sale securities, Gross Unrealized Gain | 2,921 | 1,632
Total available-for-sale securities, Gross Unrealized Loss | (194) | (120)
Fixed-maturity securities, Estimated Fair Value | 79,767 | 77,324
Fixed-Maturity Securities [Member] | Exchange-Traded Debt [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed-maturity securities, Cost or Amortized Cost | 12,084 | 9,817
Total available-for-sale securities, Gross Unrealized Gain | 300 | 177
Total available-for-sale securities, Gross Unrealized Loss | (68) | (565)
Fixed-maturity securities, Estimated Fair Value | 12,316 | 9,429
Fixed-Maturity Securities [Member] | Redeemable Preferred Stock [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed-maturity securities, Cost or Amortized Cost | 237 | 317
Total available-for-sale securities, Gross Unrealized Gain | 8 | 8
Total available-for-sale securities, Gross Unrealized Loss |  | (1)
Fixed-maturity securities, Estimated Fair Value | $ 245 | $ 324

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