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Investments - Summary of Net Investment Income (Detail) - Successor [Member] - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Investment [Line Items] |  |  |  |
Fixed income securities | $ 67,293 | $ 84,339 | $ 197,506 | $ 233,878
Short-term investments | 85 | 832 | 186 | 2,000
Loans | 113 | 123 | 338 | 415
Investment expense | (1,872) | (2,413) | (6,801) | (7,723)
Securities available-for-sale and short-term | 65,619 | 82,881 | 191,229 | 228,570
Other investments | (1,424) | 700 | 10,702 | 5,905
Total net investment income | 64,195 | 83,581 | 201,931 | 234,475
Gains (losses) on securities held as of reporting date [Member] |  |  |  |
Investment [Line Items] |  |  |  |
Net Realized and Unrealized Gain (Loss) on Trading Securities | (2,549) | 329 | 7,493 | 5,534
Trading Securities, Realized Gain (Loss) | 933 | 0 | 7,534 | (431)
Other investments | $ (3,482) | $ 329 | $ (41) | $ 5,965

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- Definition Amount of operating dividend and interest income, including amortization and accretion of premiums and discounts, on available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.2) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e24721-111560 + Details
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