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Segment Information - Summary of Financial Information by Reportable Segment (Detail) - Successor [Member] - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Revenues: |  |  |  |  |
Total revenues before expenses and reorganization items | $ 106,732 | $ 230,752 | $ 123,634 | $ 386,243 |
Pre-tax income (loss) from continuing operations: |  |  |  |  |
Pre-tax (loss) income from continuing operations | 61,511 | 286,095 | 74,365 | 502,675 |
Total assets | 23,199,111 | 25,513,636 | 23,199,111 | 25,513,636 | $ 23,728,070
Net investment income | 70,758 | 64,753 | 131,579 | 137,736 |
Amortization of insurance intangible assets | 39,013 | 38,088 | 89,903 | 75,520 |
Interest expense | 30,709 | 28,173 | 61,139 | 56,081 |
Unaffiliated Customers [Member] |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues before expenses and reorganization items | 105,582 | 229,697 | 121,353 | 384,160 |
Pre-tax income (loss) from continuing operations: |  |  |  |  |
Pre-tax (loss) income from continuing operations | 60,361 | 285,040 | 72,084 | 500,592 |
Equity Method Investee [Member] |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues before expenses and reorganization items | 1,150 | 1,055 | 2,281 | 2,083 |
Pre-tax income (loss) from continuing operations: |  |  |  |  |
Pre-tax (loss) income from continuing operations | 1,150 | 1,055 | 2,281 | 2,083 |
Inter-segment Eliminations [Member] |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues before expenses and reorganization items |  |  |  | 0 |
Pre-tax income (loss) from continuing operations: |  |  |  |  |
Pre-tax (loss) income from continuing operations |  | 163 |  | 163 |
Financial Guarantee [Member] |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues before expenses and reorganization items | 140,411 | 177,507 | 238,161 | 369,578 |
Pre-tax income (loss) from continuing operations: |  |  |  |  |
Pre-tax (loss) income from continuing operations | 99,744 | 235,895 | 196,539 | 491,361 |
Financial Services [Member] |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues before expenses and reorganization items | (36,507) | 51,008 | (120,059) | 13,070 |
Pre-tax income (loss) from continuing operations: |  |  |  |  |
Pre-tax (loss) income from continuing operations | (37,283) | 50,122 | (121,584) | 11,230 |
Corporate, Non-Segment [Member] |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues before expenses and reorganization items | 3,286 | 2,274 | 6,027 | 3,632 |
Inter-segment Eliminations [Member] |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues before expenses and reorganization items | (458) | (37) | (495) | (37) |
Operating Segments [Member] | Financial Guarantee [Member] |  |  |  |  |
Pre-tax income (loss) from continuing operations: |  |  |  |  |
Pre-tax (loss) income from continuing operations |  | (785) |  |  |
Total assets | 22,437,377 | 24,915,205 | 22,437,377 | 24,915,205 |
Net investment income | 67,531 | 62,508 | 125,245 | 133,978 |
Amortization of insurance intangible assets | 39,013 | 38,088 | 89,903 | 75,520 |
Interest expense | 30,557 | 27,842 | 60,841 | 55,427 |
Operating Segments [Member] | Financial Guarantee [Member] | Unaffiliated Customers [Member] |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues before expenses and reorganization items | 139,947 | 177,502 | 237,322 | 369,316 |
Pre-tax income (loss) from continuing operations: |  |  |  |  |
Pre-tax (loss) income from continuing operations | 99,327 | 236,680 | 197,745 | 492,685 |
Operating Segments [Member] | Financial Guarantee [Member] | Equity Method Investee [Member] |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues before expenses and reorganization items | 0 | 0 | 0 | 0 |
Pre-tax income (loss) from continuing operations: |  |  |  |  |
Pre-tax (loss) income from continuing operations | 0 | 0 | 0 | 0 |
Operating Segments [Member] | Financial Guarantee [Member] | Inter-segment Eliminations [Member] |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues before expenses and reorganization items | 464 | 5 | 839 | 262 |
Pre-tax income (loss) from continuing operations: |  |  |  |  |
Pre-tax (loss) income from continuing operations | 417 |  | (1,206) | (1,324) |
Operating Segments [Member] | Financial Services [Member] |  |  |  |  |
Pre-tax income (loss) from continuing operations: |  |  |  |  |
Pre-tax (loss) income from continuing operations |  | (252) |  |  |
Total assets | 407,942 | 316,954 | 407,942 | 316,954 |
Net investment income | 198 | 134 | 401 | 262 |
Amortization of insurance intangible assets | 0 | 0 | 0 | 0 |
Interest expense | 152 | 331 | 298 | 654 |
Operating Segments [Member] | Financial Services [Member] | Unaffiliated Customers [Member] |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues before expenses and reorganization items | (36,114) | 51,139 | (119,328) | 13,431 |
Pre-tax income (loss) from continuing operations: |  |  |  |  |
Pre-tax (loss) income from continuing operations | (36,771) | 50,374 | (120,618) | 11,794 |
Operating Segments [Member] | Financial Services [Member] | Equity Method Investee [Member] |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues before expenses and reorganization items | 0 | 0 | 0 | 0 |
Pre-tax income (loss) from continuing operations: |  |  |  |  |
Pre-tax (loss) income from continuing operations | 0 | 0 | 0 | 0 |
Operating Segments [Member] | Financial Services [Member] | Inter-segment Eliminations [Member] |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues before expenses and reorganization items | (393) | (131) | (731) | (361) |
Pre-tax income (loss) from continuing operations: |  |  |  |  |
Pre-tax (loss) income from continuing operations | (512) |  | (966) | (564) |
Inter-segment Eliminations [Member] |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues before expenses and reorganization items | 0 | 0 | 0 |  |
Pre-tax income (loss) from continuing operations: |  |  |  |  |
Pre-tax (loss) income from continuing operations | 0 | 0 | 0 | 0 |
Total assets | 4,242 | 5,379 | 4,242 | 5,379 |
Net investment income | 0 | 0 | 0 | 0 |
Amortization of insurance intangible assets | 0 | 0 | 0 | 0 |
Interest expense | 0 | 0 | 0 | 0 |
Inter-segment Eliminations [Member] | Unaffiliated Customers [Member] |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues before expenses and reorganization items | 0 | 0 | 0 | 0 |
Pre-tax income (loss) from continuing operations: |  |  |  |  |
Pre-tax (loss) income from continuing operations | 0 | 0 | 0 | 0 |
Inter-segment Eliminations [Member] | Equity Method Investee [Member] |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues before expenses and reorganization items | 0 | 0 | 0 | 0 |
Pre-tax income (loss) from continuing operations: |  |  |  |  |
Pre-tax (loss) income from continuing operations | 0 | 0 | 0 | 0 |
Inter-segment Eliminations [Member] | Inter-segment Eliminations [Member] |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues before expenses and reorganization items | (458) | (37) | (495) | (37) |
Pre-tax income (loss) from continuing operations: |  |  |  |  |
Pre-tax (loss) income from continuing operations | 0 | 163 | 0 | 163 |
Inter-segment Eliminations [Member] | Corporate, Non-Segment [Member] |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues before expenses and reorganization items | 387 | 163 | 387 | 136 |
Pre-tax income (loss) from continuing operations: |  |  |  |  |
Pre-tax (loss) income from continuing operations | 95 | 874 | 2,172 | 1,725 |
Corporate, Non-Segment [Member] |  |  |  |  |
Pre-tax income (loss) from continuing operations: |  |  |  |  |
Pre-tax (loss) income from continuing operations | (950) | (85) | (590) | (79) |
Total assets | 349,550 | 276,098 | 349,550 | 276,098 |
Net investment income | 3,029 | 2,111 | 5,933 | 3,496 |
Amortization of insurance intangible assets | 0 | 0 | 0 | 0 |
Corporate, Non-Segment [Member] | Unaffiliated Customers [Member] |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues before expenses and reorganization items | 1,749 | 1,056 | 3,359 | 1,413 |
Pre-tax income (loss) from continuing operations: |  |  |  |  |
Pre-tax (loss) income from continuing operations | (2,195) | (2,014) | (5,043) | (3,887) |
Corporate, Non-Segment [Member] | Equity Method Investee [Member] |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues before expenses and reorganization items | 1,150 | 1,055 | 2,281 | 2,083 |
Pre-tax income (loss) from continuing operations: |  |  |  |  |
Pre-tax (loss) income from continuing operations | 1,150 | 1,055 | 2,281 | 2,083 |
Corporate, Non-Segment [Member] | Corporate, Non-Segment [Member] |  |  |  |  |
Pre-tax income (loss) from continuing operations: |  |  |  |  |
Interest expense | $ 0 | $ 0 | $ 0 | $ 0 |

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