Acquisition - Additional Information (Detail) (USD $)	2 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2012		Dec. 31, 2011	Dec. 31, 2010	Nov. 30, 2012
Business Acquisition [Line Items]
Business acquisition purchase price						$ 234,000,000
Debt assumed						20,000,000
Fair value of debt securities						20,000,000
Purchase price funded with cash						214,000,000
Acquisition expenses		2,944,000	[1]
Acquisition expenses net of tax		1,914,000		0	0
Business Acquisition, Purchase Price Allocation, Goodwill, Expected Tax Deductible Amount	0	0
Revenue	33,000,000
Net Income	$ 3,100,000

[1] Family Heritage Life acquisition expense.