Investments - Major Categories of Investment Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Net Investment Income [Line Items]
Investment expenses	$ (118)	$ (169)	$ (245)	$ (336)
Investment income	1,257	1,268	2,794	2,544
Fixed maturities, available-for-sale [Member]
Net Investment Income [Line Items]
Investment income	1,162	1,270	2,401	2,553
Mutual funds, available-for-sale [Member]
Net Investment Income [Line Items]
Investment income	147	145	307	285
Limited partnership interests [Member]
Net Investment Income [Line Items]
Investment income	49		124
Equity in income (loss) of limited partnership interest [Member]
Net Investment Income [Line Items]
Investment income	(11)		153
Other [Member]
Net Investment Income [Line Items]
Investment income	$ 28	$ 22	$ 54	$ 42