Business Segments - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Segment Reporting Disclosure [Line Items]
Litigation settlement amount	$ 2,337	$ 500
Administrative settlements	(3,057)
Administrative settlement, after tax	(1,987)	0
Guaranty fund assessment		(1,155)
Guaranty fund assessment, after tax	0	751
Litigation Matters [Member]
Segment Reporting Disclosure [Line Items]
Litigation settlement amount	3,700
Litigation settlement expense (after tax)	2,400
Settled Litigation Regarding Investments [Member]
Segment Reporting Disclosure [Line Items]
Litigation settlement amount	1,300
Litigation settlement expense (after tax)	853
Settled Litigation Regarding Non-Insurance Matter [Member]
Segment Reporting Disclosure [Line Items]
Litigation settlement amount		500
Litigation settlement amount (after tax)		$ 325