Investments - Summary of Company's Investment Securities (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2016	Dec. 31, 2015
Investment Securities [Line Items]
Amortized Cost	$ 125,019	$ 128,304
Gross Unrealized Gains	6,496	4,710
Gross Unrealized Losses	(617)	(1,432)
Fair Value	130,898	131,582
Fixed Maturities
Investment Securities [Line Items]
Amortized Cost	111,560	114,845
Gross Unrealized Gains	6,055	4,367
Gross Unrealized Losses	(74)	(770)
Fair Value	117,541	118,442
Fixed Maturities \| U.S. government and agencies
Investment Securities [Line Items]
Amortized Cost	13,036	13,036
Gross Unrealized Gains	330	162
Gross Unrealized Losses		(85)
Fair Value	13,366	13,113
Fixed Maturities \| State
Investment Securities [Line Items]
Amortized Cost	698	698
Gross Unrealized Gains	5	4
Fair Value	703	702
Fixed Maturities \| Political subdivisions
Investment Securities [Line Items]
Amortized Cost	4,323	4,354
Gross Unrealized Gains	51	9
Fair Value	4,374	4,363
Fixed Maturities \| Revenue and assessment
Investment Securities [Line Items]
Amortized Cost	10,117	11,770
Gross Unrealized Gains	1,161	895
Gross Unrealized Losses		(21)
Fair Value	11,278	12,644
Fixed Maturities \| Corporate bonds
Investment Securities [Line Items]
Amortized Cost	78,181	79,426
Gross Unrealized Gains	3,480	2,022
Gross Unrealized Losses	(63)	(663)
Fair Value	81,598	80,785
Fixed Maturities \| Collateralized mortgage obligations: Agency Backed
Investment Securities [Line Items]
Amortized Cost	782	793
Gross Unrealized Gains	85	80
Fair Value	867	873
Fixed Maturities \| Collateralized mortgage obligations: Non-agency backed - residential
Investment Securities [Line Items]
Amortized Cost	2,750	2,877
Gross Unrealized Gains	491	579
Gross Unrealized Losses	(11)	(1)
Fair Value	3,230	3,455
Fixed Maturities \| Collateralized mortgage obligations: Non-agency backed - commercial
Investment Securities [Line Items]
Amortized Cost	1,673	1,891
Gross Unrealized Gains	452	616
Fair Value	2,125	2,507
Preferred stock, available-for-sale
Investment Securities [Line Items]
Amortized Cost	1,500	1,500
Gross Unrealized Gains	265	223
Fair Value	1,765	1,723
Mutual funds, available-for-sale
Investment Securities [Line Items]
Amortized Cost	11,959	11,959
Gross Unrealized Gains	176	120
Gross Unrealized Losses	(543)	(662)
Fair Value	$ 11,592	$ 11,417

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)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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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)
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563

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Amount of unrealized loss before deducting unrealized gain on investments in 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 (c)
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563

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- Definition

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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 35
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e24584-111560

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Available-for-Sale Securities
-URI http://asc.fasb.org/extlink&oid=6505594

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 1
-Subparagraph a, f, g
-Article 7

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