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Investments - Schedule of Investments in Fixed Maturity Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Debt Maturities, Single Maturity Date	$ 9,200	$ 9,500
Cost	34,131	28,638
Gross Unrealized Gains	17	24
Gross Unrealized Losses	(94)	(60)
Fair Value	34,054	28,602
U.S. Treasury securities, obligations of U.S. Government agencies and Municipalities
Schedule of Available-for-sale Securities [Line Items]
Cost	32,724	26,280
Gross Unrealized Gains	1	11
Gross Unrealized Losses	(94)	(59)
Fair Value	32,631	26,232
Corporate debt
Schedule of Available-for-sale Securities [Line Items]
Cost	1,407	2,358
Gross Unrealized Gains	16	13
Gross Unrealized Losses	0	(1)
Fair Value	$ 1,423	$ 2,370

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- Definition

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

+ References

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

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