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Other Comprehensive Income (Loss) - Reclassifications Out of Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net realized gains (losses) on investments $ 1,710 $ 576 $ 1,647 $ 1,243
Income taxes (18,547) (21,247) (34,719) (37,120)
NET INCOME 29,376 33,647 60,575 58,873
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 1,710 576 1,647 1,243
Income taxes (654) (220) (630) (475)
NET INCOME $ 1,056 $ 356 $ 1,017 $ 768