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Special Purpose Entities, Including Variable Interest Entities - Summary of Fair Value of Fixed Income Securities, by Asset-Type, Held by Consolidated Variable Interest Entities (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Variable Interest Entities [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,480,532 and $3,020,744) | $ 3,472,642 | $ 3,451,149
Investments: |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 147,650 | 133,052
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 8,345 | $ 38,195
Municipal Bonds [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Variable Interest Entities [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,480,532 and $3,020,744) | 259,474 |
Investments: |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 11,117 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | $ 0 |

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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