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Schedule of Investment Income (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Investment income | $ 10,044 | $ 8,835 | $ 19,121 | $ 18,248
Investment expense | (903) | (1,158) | (1,739) | (2,287)
Net investment income | 9,141 | 7,677 | 17,382 | 15,961
Fixed Maturities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Investment income | 8,022 | 6,797 | 16,036 | 14,052
Equity Securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Investment income | 924 | 1,941 | 1,716 | 4,081
Cash and Cash Equivalents |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Investment income | 9 | 10 | 27 | 28
Other Invested Assets |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Investment income | $ 1,089 | $ 87 | $ 1,342 | $ 87

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- Definition Amount before accretion (amortization) of purchase discount (premium) of interest income and dividend income on nonoperating securities. + 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(a),(b)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.2) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 16 -Article 12 + Details
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