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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, 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

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