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Reclassifications Out of Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Other net realized investment gains $ (316) $ 885
Other than temporary impairment losses on investments   (110)
Income before income taxes 4,448 9,280
Income tax expense 1,253 3,002
Net income 5,701 12,282
Total reclassifications, net of tax 75 (406)
Unrealized Gains and Losses on Available for Sale Securities    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Total reclassifications, net of tax 75 (399)
Foreign Currency Items    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Total reclassifications, net of tax   (7)
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 93 (701)
Other than temporary impairment losses on investments   110
Income before income taxes 93 (591)
Income tax expense (18) 192
Net income $ 75 (399)
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   (11)
Income tax expense   4
Net income   $ (7)