Investments - Summary of Company's Investment Securities (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2015	Dec. 31, 2014
Investment Securities [Line Items]
Amortized Cost	$ 131,614	$ 119,119
Gross Unrealized Gains	5,094	6,648
Gross Unrealized Losses	(963)	(682)
Fair Value	135,745	125,085
Fixed Maturities
Investment Securities [Line Items]
Amortized Cost	118,154	107,718
Gross Unrealized Gains	4,818	5,978
Gross Unrealized Losses	(671)	(674)
Fair Value	122,301	113,022
Fixed Maturities \| U.S. government and agencies
Investment Securities [Line Items]
Amortized Cost	13,037	8,039
Gross Unrealized Gains	277	277
Gross Unrealized Losses		(26)
Fair Value	13,314	8,290
Fixed Maturities \| State
Investment Securities [Line Items]
Amortized Cost	698	698
Gross Unrealized Gains	5	27
Fair Value	703	725
Fixed Maturities \| Political subdivisions
Investment Securities [Line Items]
Amortized Cost	499	500
Gross Unrealized Gains		6
Fair Value	499	506
Fixed Maturities \| Revenue and assessment
Investment Securities [Line Items]
Amortized Cost	12,544	14,856
Gross Unrealized Gains	936	1,522
Gross Unrealized Losses		(18)
Fair Value	13,480	16,360
Fixed Maturities \| Corporate bonds
Investment Securities [Line Items]
Amortized Cost	84,579	73,051
Gross Unrealized Gains	2,279	2,698
Gross Unrealized Losses	(669)	(630)
Fair Value	86,189	75,119
Fixed Maturities \| Collateralized mortgage obligations: Agency Backed
Investment Securities [Line Items]
Amortized Cost	1,734	4,647
Gross Unrealized Gains	93	160
Fair Value	1,827	4,807
Fixed Maturities \| Collateralized mortgage obligations: Non-agency backed - residential
Investment Securities [Line Items]
Amortized Cost	3,054	3,513
Gross Unrealized Gains	618	624
Gross Unrealized Losses	(2)
Fair Value	3,670	4,137
Fixed Maturities \| Collateralized mortgage obligations: Non-agency backed - commercial
Investment Securities [Line Items]
Amortized Cost	2,009	2,414
Gross Unrealized Gains	610	664
Fair Value	2,619	3,078
Preferred stock, available-for-sale
Investment Securities [Line Items]
Amortized Cost	1,500	1,500
Gross Unrealized Gains	227	267
Fair Value	1,727	1,767
Mutual funds, available-for-sale
Investment Securities [Line Items]
Amortized Cost	11,960	9,901
Gross Unrealized Gains	49	403
Gross Unrealized Losses	(292)	(8)
Fair Value	$ 11,717	$ 10,296

Investment securities.

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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.2)

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Amount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities.

+ 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 of unrealized loss before deducting unrealized gain on investments in available-for-sale securities.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Trading Securities

-URI http://asc.fasb.org/extlink&oid=6526789

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Available-for-Sale Securities

-URI http://asc.fasb.org/extlink&oid=6505594

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Subparagraph a, f, g

-Article 7

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