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Investments - Schedule of Credit Quality of Fixed Maturities (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Fair Value	$ 323,145	$ 289,418
Percentage of total Fair Value	100.00%	100.00%
Standard & Poor's, AAA Rating [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value	30,547	82,889
Percentage of total Fair Value	9.50%	28.60%
Standard & Poor's, AA Rating [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value	191,775	120,976
Percentage of total Fair Value	59.30%	41.80%
Standard & Poor's, A Rating [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value	49,930	46,689
Percentage of total Fair Value	15.50%	16.10%
Standard & Poor's, BBB Rating [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value	41,812	38,114
Percentage of total Fair Value	12.90%	13.20%
Standard & Poor's, BB- Rating [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value	1,504
Percentage of total Fair Value	0.50%
Standard & Poor's, Not Rated [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value	$ 7,577	$ 750
Percentage of total Fair Value	2.30%	0.30%