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Net Investment Income (Detail) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
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Jun. 30, 2012
|
Jun. 30, 2011
|
Jun. 30, 2012
|
Jun. 30, 2011
|
|
| Schedule of Investment Income, Reported Amounts, by Category [Line Items] | ||||
| Gross investment income | $ 16,544 | $ 13,388 | $ 31,197 | $ 27,834 |
| Less: Investment expenses and interest expense on securities sold under agreement to repurchase | 200 | 221 | 335 | 475 |
| Net investment income | 16,344 | 13,167 | 30,862 | 27,359 |
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Fixed maturities
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| Schedule of Investment Income, Reported Amounts, by Category [Line Items] | ||||
| Gross investment income | 16,059 | 12,302 | 29,723 | 25,976 |
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Equity securities
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| Schedule of Investment Income, Reported Amounts, by Category [Line Items] | ||||
| Gross investment income | 100 | 120 | 498 | 286 |
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Cash and cash equivalents
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| Schedule of Investment Income, Reported Amounts, by Category [Line Items] | ||||
| Gross investment income | $ 385 | $ 966 | $ 976 | $ 1,572 |