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Investments - Effect of Trading Activities by Type of Instrument and by Line Item in Condensed Consolidated Statements of Income (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012
Net Investment Income [Line Items] |  |
Total realized gains (losses) on trading portfolio | $ (16,037)us-gaap_TradingSecuritiesRealizedGainLoss | $ (11,943)us-gaap_TradingSecuritiesRealizedGainLoss
Total change in unrealized gains (losses) on trading portfolio | 7,874us-gaap_TradingSecuritiesUnrealizedHoldingGainLoss | 9,443us-gaap_TradingSecuritiesUnrealizedHoldingGainLoss
Net gains (losses) recognized on trading portfolio | (8,163)us-gaap_NetRealizedOrUnrealizedGainLossOnTradingSecurities | (2,500)us-gaap_NetRealizedOrUnrealizedGainLossOnTradingSecurities
Equity Securities [Member] |  |
Net Investment Income [Line Items] |  |
Total realized gains (losses) on trading portfolio | (15,969)us-gaap_TradingSecuritiesRealizedGainLoss / us-gaap_InvestmentTypeAxis = us-gaap_EquitySecuritiesMember | (12,286)us-gaap_TradingSecuritiesRealizedGainLoss / us-gaap_InvestmentTypeAxis = us-gaap_EquitySecuritiesMember
Total change in unrealized gains (losses) on trading portfolio | 7,758us-gaap_TradingSecuritiesUnrealizedHoldingGainLoss / us-gaap_InvestmentTypeAxis = us-gaap_EquitySecuritiesMember | 9,158us-gaap_TradingSecuritiesUnrealizedHoldingGainLoss / us-gaap_InvestmentTypeAxis = us-gaap_EquitySecuritiesMember
Fixed Maturities [Member] |  |
Net Investment Income [Line Items] |  |
Total change in unrealized gains (losses) on trading portfolio | 13us-gaap_TradingSecuritiesUnrealizedHoldingGainLoss / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember | 195us-gaap_TradingSecuritiesUnrealizedHoldingGainLoss / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember
Other Investments [Member] |  |
Net Investment Income [Line Items] |  |
Total change in unrealized gains (losses) on trading portfolio | 14us-gaap_TradingSecuritiesUnrealizedHoldingGainLoss / us-gaap_InvestmentTypeAxis = us-gaap_OtherInvestmentsMember | (55)us-gaap_TradingSecuritiesUnrealizedHoldingGainLoss / us-gaap_InvestmentTypeAxis = us-gaap_OtherInvestmentsMember
Derivatives (Non-Hedging Instruments) [Member] |  |
Net Investment Income [Line Items] |  |
Total realized gains (losses) on trading portfolio | (68)us-gaap_TradingSecuritiesRealizedGainLoss / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 343us-gaap_TradingSecuritiesRealizedGainLoss / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Total change in unrealized gains (losses) on trading portfolio | $ 89us-gaap_TradingSecuritiesUnrealizedHoldingGainLoss / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | $ 145us-gaap_TradingSecuritiesUnrealizedHoldingGainLoss / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember

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- Definition The sum of the realized and unrealized net gain (loss) on trading securities during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 + Details
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- Definition This item represents the gain (loss) realized during the period from the sale of trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph c -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(c)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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- Definition Amount of unrealized holding gain (loss) recognized in the income statement for investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(c)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e24584-111560 + Details
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