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Other Comprehensive Income (Loss) - Reclassifications Out of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Net realized gains (losses) on investments | $ 11 | $ 501 | $ 292 | $ 5,353
Income taxes | (17,602) | (15,811) | (49,811) | (38,662)
NET INCOME | 30,298 | 21,341 | 77,332 | 52,016
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Net realized gains (losses) on investments | 11 | 501 | 292 | 5,353
Income taxes | (4) | (193) | (113) | (2,065)
NET INCOME | $ 7 | $ 308 | $ 179 | $ 3,288

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