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)