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Reclassifications Out of Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Other net realized investment gains (losses) $ (6,137) $ 1,164 $ (337) $ 40,294
Other than temporary impairment losses on investments (4,641) (6) (6,879) (68)
Income (loss) before income taxes (9,727) 8,128 3,283 59,900
Income tax (benefit) 5,981 1,633 10,882 (8,108)
Net income (loss) (3,746) 9,761 14,165 51,792
Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net income (loss) 2,199 (1,524) (517) (35,312)
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gains and Losses on Available for Sale Securities        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Other net realized investment gains (losses) (2,042) (2,355) (9,168) (53,729)
Other than temporary impairment losses on investments 4,641 6 6,879 68
Income (loss) before income taxes 2,599 (2,349) (2,289) (53,661)
Income tax (benefit) (470) 826 1,376 18,425
Net income (loss) 2,129 (1,523) (913) (35,236)
Reclassification out of Accumulated Other Comprehensive Income | Foreign Currency Items        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Other net realized investment gains (losses) 108 (1) 609 (117)
Income tax (benefit) (38)   (213) 41
Net income (loss) $ 70 $ (1) $ 396 $ (76)