Investments - Fair Value and Gross Unrealized Losses of Fixed Maturity Securities in Continuous Unrealized Loss Position for Greater than 12 Months (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014 Security	Dec. 31, 2013 Security
Schedule of Available-for-sale Securities [Line Items]
Number of Securities	7	7
Fair Value	$ 14,328	$ 13,980
Gross Unrealized Losses	(892)	(1,270)
Less Than or Equal to 10% [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of Securities	7	7
Fair Value	14,328	13,980
Gross Unrealized Losses	(892)	(1,270)
Greater Than 10% [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of Securities
Fair Value
Gross Unrealized Losses