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Investments - Gross Unrealized Gains and Losses and Cost or Amortized Cost and Fair Value of Investments Classified as Available-for-Sale (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Investment [Line Items]
Available-for-Sale, Cost or Amortized Cost	$ 418,364	$ 386,109
Available-for-Sale, Gross Unrealized Gains	11,650	9,447
Available-for-Sale, Gross Unrealized Losses	(2,025)	(3,286)
Available-for-Sale, Fair Value	427,989	392,270
Total Fixed Maturity [Member]
Investment [Line Items]
Available-for-Sale, Cost or Amortized Cost	408,364	376,109
Available-for-Sale, Gross Unrealized Gains	10,229	7,199
Available-for-Sale, Gross Unrealized Losses	(2,025)	(3,286)
Available-for-Sale, Fair Value	416,568	380,022
Other Investments [Member]
Investment [Line Items]
Available-for-Sale, Cost or Amortized Cost	10,000	10,000
Available-for-Sale, Gross Unrealized Gains	1,390	2,217
Available-for-Sale, Fair Value	11,390	12,217
States and Political Subdivisions [Member]
Investment [Line Items]
Available-for-Sale, Cost or Amortized Cost	165,016	164,684
Available-for-Sale, Gross Unrealized Gains	7,752	6,942
Available-for-Sale, Gross Unrealized Losses	(172)	(207)
Available-for-Sale, Fair Value	172,596	171,419
Corporate Bonds [Member]
Investment [Line Items]
Available-for-Sale, Cost or Amortized Cost	212,938	202,537
Available-for-Sale, Gross Unrealized Gains	2,241	253
Available-for-Sale, Gross Unrealized Losses	(723)	(1,486)
Available-for-Sale, Fair Value	214,456	201,304
U.S. Agency-Based Mortgage-Backed Securities [Member]
Investment [Line Items]
Available-for-Sale, Cost or Amortized Cost	13,009	8,888
Available-for-Sale, Gross Unrealized Gains	3	4
Available-for-Sale, Gross Unrealized Losses	(1,130)	(1,593)
Available-for-Sale, Fair Value	11,882	7,299
Equity Securities [Member]
Investment [Line Items]
Available-for-Sale, Gross Unrealized Gains	31	31
Available-for-Sale, Fair Value	31	$ 31
U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member]
Investment [Line Items]
Available-for-Sale, Cost or Amortized Cost	17,401
Available-for-Sale, Gross Unrealized Gains	233
Available-for-Sale, Fair Value	$ 17,634

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

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