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Other Comprehensive Income (Loss) - Reclassifications Out of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Net realized gains (losses) on investments | $ 667 | $ 171
Income taxes | (15,873) | (15,693)
NET INCOME | 25,226 | 22,330
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 | 667 | 171
Income taxes | (255) | (65)
NET INCOME | $ 412 | $ 106

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