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Other Comprehensive Income (Loss) - Reclassifications Out of Accumulated Other Comprehensive Income (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net realized gains (losses) on investments |  |  |  |  |  |  |  |  | $ 5,627us-gaap_MarketableSecuritiesRealizedGainLoss | $ (14,740)us-gaap_MarketableSecuritiesRealizedGainLoss | $ (11,943)us-gaap_MarketableSecuritiesRealizedGainLoss
Income taxes, current |  |  |  |  |  |  |  |  | (53,498)us-gaap_CurrentIncomeTaxExpenseBenefit | (34,216)us-gaap_CurrentIncomeTaxExpenseBenefit | (18,434)us-gaap_CurrentIncomeTaxExpenseBenefit
NET INCOME | 20,972us-gaap_NetIncomeLoss | 21,341us-gaap_NetIncomeLoss | 17,126us-gaap_NetIncomeLoss | 13,549us-gaap_NetIncomeLoss | 15,582us-gaap_NetIncomeLoss | 14,407us-gaap_NetIncomeLoss | 17,029us-gaap_NetIncomeLoss | 11,959us-gaap_NetIncomeLoss | 72,988us-gaap_NetIncomeLoss | 58,977us-gaap_NetIncomeLoss | 30,312us-gaap_NetIncomeLoss
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 |  |  |  |  |  |  |  |  | 5,627us-gaap_MarketableSecuritiesRealizedGainLoss / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | 1,297us-gaap_MarketableSecuritiesRealizedGainLoss / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
Income taxes, current |  |  |  |  |  |  |  |  | (2,171)us-gaap_CurrentIncomeTaxExpenseBenefit / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | (500)us-gaap_CurrentIncomeTaxExpenseBenefit / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
NET INCOME |  |  |  |  |  |  |  |  | $ 3,456us-gaap_NetIncomeLoss / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | $ 797us-gaap_NetIncomeLoss / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |

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