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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
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net realized gains (losses) on investments |  |  |  |  |  |  |  |  | $ 2,570 | $ 2,294 | $ 1,060
Income taxes, current |  |  |  |  |  |  |  |  | (63,549) | (63,473) | (68,539)
NET INCOME | $ 36,396 | $ 9,964 | $ 29,376 | $ 31,199 | $ 13,655 | $ 26,882 | $ 33,647 | $ 25,226 | 106,935 | 99,410 | 106,484
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 |  |  |  |  |  |  |  |  | 2,570 | 2,294 | 1,060
Income taxes, current |  |  |  |  |  |  |  |  | (982) | (877) | (406)
NET INCOME |  |  |  |  |  |  |  |  | $ 1,588 | $ 1,417 | $ 654

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