Business Segments - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012
Segment Reporting [Abstract]
Guaranty fund assessment	$ 1,155	[1]
Guaranty fund assessment, after tax	751		0
Legal settlement related to a non insurance matter	500	[2]
Legal settlement related to a non insurance matter, after tax	$ 325		$ 0

[1] Guaranty Fund Assessment.

[2] Legal settlement expense.