Investments - Schedule of Investments in Fixed Maturity Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Cost	$ 22,830	$ 19,821
Gross Unrealized Gains	118	53
Gross Unrealized Losses	(5)	(12)
Fair Value	22,943	19,862
U.S. Treasury securities, obligations of U.S. Government agencies and Municipals
Schedule of Available-for-sale Securities [Line Items]
Cost	15,640	10,774
Gross Unrealized Gains	74	7
Gross Unrealized Losses	0	(1)
Fair Value	15,714	10,780
Foreign government
Schedule of Available-for-sale Securities [Line Items]
Cost	50	50
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	50	50
Corporate debt
Schedule of Available-for-sale Securities [Line Items]
Cost	5,280	5,854
Gross Unrealized Gains	14	9
Gross Unrealized Losses	(5)	(11)
Fair Value	5,289	5,852
Short duration fixed income fund
Schedule of Available-for-sale Securities [Line Items]
Cost	1,860	3,143
Gross Unrealized Gains	30	37
Gross Unrealized Losses	0
Fair Value	$ 1,890	$ 3,180