Investments - Scheduled Contractual Maturities of Fixed-Maturity Securities (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Available-for-sale
Due in one year or less, Amortized Cost	$ 3,347	$ 2,366
Due after one year through five years, Amortized Cost	31,570	24,829
Due after five years through ten years, Amortized Cost	69,097	59,083
Due after ten years, Amortized Cost	14,799	13,531
Commercial mortgage-backed securities, Amortized Cost	10,867	10,929
Amortized Cost Total	129,680	110,738
Due in one year or less, Fair Value	3,402	2,381
Due after one year through five years, Fair Value	32,140	25,145
Due after five years through ten years, Fair Value	70,901	59,582
Due after ten years, Fair Value	15,392	13,711
Commercial mortgage-backed securities, Fair Value	11,278	11,332
Fair Value Total	$ 133,113	$ 112,151