Business Segments - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Segment Reporting Disclosure [Line Items]
Litigation settlement amount related to insurance operations			$ 2,337
Administrative settlement expense	$ 3,100		3,057
Administrative settlement, after tax	$ 2,000	$ 0	1,987
Settled Litigation Regarding Investments [Member]
Segment Reporting Disclosure [Line Items]
Litigation settlement expense, after tax			853
Litigation settlement amount related to investments			1,300
Settled Litigation Regarding Non-Insurance Matter [Member]
Segment Reporting Disclosure [Line Items]
Litigation settlement amount related to insurance operations			3,700
Prior Year Litigation Matter [Member]
Segment Reporting Disclosure [Line Items]
Litigation settlement expense, after tax			$ 2,400