Financial Information of Registrant (Parent Company) (Detail 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statements of Operations
Investment income									$ 5,123	$ 5,716	$ 6,599
Equity in income (loss) of subsidiaries, net of tax									85	399
Income (loss) before income taxes	3,076	2,377	3,723	547	3,363	2,096	2,254	2,117	9,723	9,830	(9,045)
Benefit for income taxes									(18,345)	650	(5)
Net income (loss)	21,968	2,120	3,469	511	3,158	1,932	2,066	2,024	28,068	9,180	(9,040)
Parent Company [Member]
Statements of Operations
Investment income									61	52	93
Equity in income (loss) of subsidiaries, net of tax									23,804	11,657	(6,830)
Expenses									(2,887)	(2,529)	(2,303)
Income (loss) before income taxes									20,978	9,180	(9,040)
Benefit for income taxes									(7,090)
Net income (loss)									$ 28,068	$ 9,180	$ (9,040)