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Schedule of Total Investment Return (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Net Investment Income [Line Items] |  |  |  |  |
Net investment income |  | $ 8,852 | $ 6,527 | $ 26,234 | $ 22,488
Net realized investment gains (losses) |  | (10,778) | 1,158 | (7,216) | 40,226
Change in unrealized holding gains and losses |  | (10,420) | (11,876) | (15,575) | (43,650)
Net realized and unrealized investment returns |  | (21,198) | (10,718) | (22,791) | (3,424)
Total investment return |  | $ (12,346) | $ (4,191) | $ 3,443 | $ 19,064
Total investment return % | [1] | (0.70%) | (0.30%) | 0.20% | 1.20%
Average investment portfolio | [2] | $ 1,800,993 | $ 1,558,501 | $ 1,788,777 | $ 1,541,336
[1] | Not annualized.
[2] | Average of total cash and invested assets, net of receivable/payable for securities purchased and sold, as of the beginning and end of the period.

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- Definition This item represents the total realized gain (loss) included in earnings for the period as a result of selling marketable securities categorized as trading, available-for-sale, or held-to-maturity. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity 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(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 -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27405-111563 + 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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