Investments - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Schedule of Investments [Line Items]
Non-credit OTTI on fixed maturities in an unrealized gain position	$ 600,000	$ 500,000
Equity Securities | Maximum
Schedule of Investments [Line Items]
Percentage of fair value under carrying value	80.00%
Mortgage-backed and asset-backed securities
Schedule of Investments [Line Items]
Securities, effective maturities	4 years 1 month 6 days
Non-government backed securities
Schedule of Investments [Line Items]
Gross Unrealized Loss	$ 600,000	$ 1,100,000
Non-government backed securities | Maximum
Schedule of Investments [Line Items]
Percentage of investment	5.00%	5.00%