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Reclassifications Out of Accumulated Other Comprehensive Income (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Other net realized investment gains $ 1,164 $ 1,818 $ 40,294 $ 11,434
Other than temporary impairment losses on investments (6) (177) (68) (1,230)
Income before income taxes 8,128 5,056 59,900 25,554
Income tax benefit 1,633 1,892 (8,108) 2,423
Net income 9,761 6,948 51,792 27,977
Reclassification out of Accumulated Other Comprehensive Income
        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net income (1,524) (1,004) (35,312) (6,656)
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 (2,355) (1,818) (53,729) (11,724)
Other than temporary impairment losses on investments 6 177 68 1,230
Income before income taxes (2,349) (1,641) (53,661) (10,494)
Income tax benefit 826 637 18,425 3,650
Net income (1,523) (1,004) (35,236) (6,844)
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 (1)   (117) 290
Income tax benefit     41 (102)
Net income $ (1)   $ (76) $ 188