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Quantitative Information About Level 3 Fair Value Measurements (Detail) (USD $)
In Thousands, unless otherwise specified |
9 Months Ended | ||||||||
|---|---|---|---|---|---|---|---|---|---|
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Sep. 30, 2012
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Dec. 31, 2011
|
Sep. 30, 2012
Fixed maturity securities available for sale
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Dec. 31, 2011
Fixed maturity securities available for sale
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Sep. 30, 2012
Level 3
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Dec. 31, 2011
Level 3
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Sep. 30, 2012
Level 3
Fixed maturity securities available for sale
|
Sep. 30, 2012
Level 3
Minimum
Fixed maturity securities available for sale
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Sep. 30, 2012
Level 3
Maximum
Fixed maturity securities available for sale
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |||||||||
| Fixed maturity securities | $ 2,916,078 | $ 2,718,831 | $ 2,878,625 | $ 2,682,142 | $ 53,001 | $ 44,882 | $ 51,792 | ||
| Fair Value of Fixed maturity securities on Valuation Technique | Market comparable | ||||||||
| Fair Value Measurements Unobservable Inputs | Spread adjustment | ||||||||
| Fair value inputs spread adjustment, range | 0.69% | 3.53% | |||||||
| Fair value input Spread adjustment percentage of Weighted Average for Fair Value Measurement | 2.04% | ||||||||