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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 | 3 Months Ended | 9 Months Ended
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Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Net Investment Income [Line Items] |  |  |  |
Total realized gains (losses) on trading portfolio |  | $ (3,142) | $ (16,037) | $ (12,296)
Total change in unrealized gains (losses) on trading portfolio |  | 8,091 | 7,874 | 11,490
Net gains (losses) recognized on trading portfolio |  | 4,949 | (8,163) | (806)
Fixed Maturities [Member] |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Total realized gains (losses) on trading portfolio |  |  |  |
Total change in unrealized gains (losses) on trading portfolio |  | 55 | 13 | 192
Equity Securities [Member] |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Total realized gains (losses) on trading portfolio |  | (3,299) | (15,969) | (12,728)
Total change in unrealized gains (losses) on trading portfolio |  | 8,119 | 7,758 | 11,291
Derivatives (Non-Hedging Instruments) [Member] |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Total realized gains (losses) on trading portfolio |  | 157 | (68) | 432
Total change in unrealized gains (losses) on trading portfolio |  | (55) | 89 | 62
Other Investments [Member] |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Total change in unrealized gains (losses) on trading portfolio |  | $ (28) | $ 14 | $ (55)

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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 Marketable Securities, Realized Gain (Loss) Trading Portfolio + References No definition available. + Details
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- Definition Marketable Securities, Unrealized Gain (Loss) Trading Portfolio + References No definition available. + Details
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