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Components of Net Realized Investment Gains (Losses) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Total net realized investment gains (losses) | $ (10,778) | $ 1,158 | $ (7,216) | $ 40,226
Not Designated as Hedging Instrument | Interest Rate Swap |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Gross realized gains |  | 147 |  |
Gross realized losses | (8,071) | (1,339) | (8,896) | (13,552)
Total net realized investment gains (losses) | (8,071) | (1,192) | (8,896) | (13,552)
Fixed Maturities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Gross realized gains | 110 | 262 | 1,589 | 2,651
Gross realized losses | (1,451) | (471) | (1,692) | (697)
Total net realized investment gains (losses) | (1,341) | (209) | (103) | 1,954
Common Shares |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Gross realized gains | 3,494 | 2,559 | 9,418 | 52,434
Gross realized losses | (4,860) |  | (7,731) | (610)
Total net realized investment gains (losses) | $ (1,366) | $ 2,559 | 1,687 | $ 51,824
Preferred Stock |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Gross realized gains |  |  | 96 |
Total net realized investment gains (losses) |  |  | $ 96 |

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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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