Business Segments - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Litigation settlement amount		$ 2,337	$ 9,125
Administrative settlements	$ 1,394	8,178
Administrative settlement, after tax	$ 906	5,316	0
Guaranty fund assessment			1,155
Guaranty fund assessment, after tax			751
Family Heritage [Member]
Segment Reporting Information [Line Items]
Acquisition adjustment, after tax			522
Settled Litigation Regarding Non-Insurance Matter [Member]
Segment Reporting Information [Line Items]
Litigation settlement amount		3,700	500
Litigation settlement expense, after tax		2,400	325
Settled Litigation Regarding Investments [Member]
Segment Reporting Information [Line Items]
Litigation settlement amount		1,300
Litigation settlement amount, after tax		$ 853
Prior Years Litigation Matter [Member]
Segment Reporting Information [Line Items]
Litigation settlement amount			8,600
Litigation settlement expense, after tax			$ 5,600