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Other Comprehensive Income (Loss) - Reclassifications Out of Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Net realized gains (losses) on investments                 $ 2,294 $ 1,060 $ 5,627
Income taxes, current                 (63,473) (68,539) (54,616)
NET INCOME $ 13,655 $ 26,882 $ 33,647 $ 25,226 $ 29,152 $ 30,298 $ 24,704 $ 22,330 99,410 106,484 72,988
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Net realized gains (losses) on investments                 2,294 1,060 5,627
Income taxes, current                 (877) (406) (2,171)
NET INCOME                 $ 1,417 $ 654 $ 3,456