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Investments - Effect of Trading Activities by Type of Instrument and by Line Item in Condensed Consolidated Statements of Income (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2013 USD ($)
Net Investment Income [Line Items]
Total realized gains (losses) on trading portfolio	$ (16,037)
Total change in unrealized gains (losses) on trading portfolio	7,874
Net gains (losses) recognized on trading portfolio	(8,163)
Equity Securities [Member]
Net Investment Income [Line Items]
Total realized gains (losses) on trading portfolio	(15,969)
Total change in unrealized gains (losses) on trading portfolio	7,758
Fixed Maturities [Member]
Net Investment Income [Line Items]
Total change in unrealized gains (losses) on trading portfolio	13
Other Investments [Member]
Net Investment Income [Line Items]
Total change in unrealized gains (losses) on trading portfolio	14
Derivatives (Non-Hedging Instruments) [Member]
Net Investment Income [Line Items]
Total realized gains (losses) on trading portfolio	(68)
Total change in unrealized gains (losses) on trading portfolio	$ 89

X

- 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
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27476-111563

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

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+ References

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- Definition

Amount of gain (loss) realized from securities 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

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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
-Glossary Trading Securities
-URI http://asc.fasb.org/extlink&oid=6526789

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
-Topic 320
-SubTopic 10
-Section 35
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e24584-111560

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

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