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Schedule II - Condensed Financial Information of Registrant (Parent Company Only) - Condensed Statements of Cash Flows (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Aug. 03, 2018
Cash flows from operating activities: |  |  |  |
Net income (loss) | $ (437,000) | $ (216,000) | $ 267,000 |
Adjustments to reconcile net income loss to net cash used in operating activities: |  |  |  |
Accretion (Amortization) of Discounts and Premiums, Investments | (15,000) | (63,000) | (137,000) |
Net realized investment gains | (22,000) | (81,000) | (108,000) |
Decrease in current income taxes payable | 17,000 | 35,000 | (35,000) |
Share-based compensation | 11,000 | 12,000 | 12,000 |
Other, net | 59,000 | 79,000 | 68,000 |
Net cash used in operating activities | (175,000) | (311,000) | (1,543,000) |
Cash flows from investing activities: |  |  |  |
Proceeds from matured bonds | 137,000 | 379,000 | 432,000 |
Purchases of bonds | (975,000) | (959,000) | (528,000) |
Change in short-term investments | 158,000 | (218,000) | 127,000 |
Proceeds from Sale and Maturity of Other Investments | 374,000 | 81,000 | 159,000 |
Payments for (Proceeds from) Other Investing Activities | 1,000 | (2,000) | 0 |
Net cash provided by investing activities | 432,000 | 1,000,000 | 1,588,000 |
Capital Contribution to Subsidiaries | (29,000) |  |  |
AMPS Proceeds | 0 | 19,000 | 0 |
Cash flows from financing activities: |  |  |  |
AMPS Exchange Cash Paid | 0 | 0 | (11,000) |
Net Cash Provided by (Used in) Financing Activities | (303,000) | (691,000) | (585,000) |
Cash and Cash Equivalents, Period Increase (Decrease) | (46,000) | (2,000) | (541,000) |
Cash and cash equivalents at beginning of period | 24,000 | 63,000 |  |
Cash and cash equivalents end of period | 20,000 | 24,000 | 63,000 |
Cash paid during the period for: |  |  |  |
Income taxes | 11,000 | 21,000 | 35,000 |
Payments to Acquire Businesses, Net of Cash Acquired | (74,000) |  |  |
Parent Company [Member] |  |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |  |
AMPS Exchange Dollar Value Warrants Issued |  |  |  | $ 8,000
Parent Company [Member] |  |  |  |
Cash flows from operating activities: |  |  |  |
Net income (loss) | (437,000) | (216,000) | 186,000 |
Adjustments to reconcile net income loss to net cash used in operating activities: |  |  |  |
Equity in undistributed net (income) loss of non-debtor subsidiaries | 423,000 | 223,000 | (157,000) |
Accretion (Amortization) of Discounts and Premiums, Investments | (6,000) | (6,000) | (7,000) |
Net realized investment gains | 1,000 | 2,000 | 2,000 |
Decrease in current income taxes payable | 30,000 | 15,000 | (15,000) |
Share-based compensation | 11,000 | 12,000 | 12,000 |
Decrease in other assets | (1,000) | (8,000) | 12,000 |
Other, net | (10,000) | (6,000) | 0 |
Net cash used in operating activities | 11,000 | 16,000 | 32,000 |
Cash flows from investing activities: |  |  |  |
Proceeds from matured bonds | 46,000 | 86,000 | 230,000 |
Purchases of bonds | (45,000) | (2,000) | (137,000) |
Change in short-term investments | 89,000 | (125,000) | (123,000) |
Net cash provided by investing activities | 16,000 | (22,000) | (21,000) |
Cash flows from financing activities: |  |  |  |
AMPS Exchange Cash Paid | 0 |  |  |
Cash and Cash Equivalents, Period Increase (Decrease) | (2,000) | (6,000) | 11,000 |
Cash and cash equivalents at beginning of period | 9,000 | 15,000 | 4,000 |
Cash and cash equivalents end of period | 7,000 | 9,000 | 15,000 |
Cash paid during the period for: |  |  |  |
Income taxes |  | 1,000 | 4,000 |
Payments to Acquire Businesses, Net of Cash Acquired | (74,000) |  |  |
Parent [Member] |  |  |  |
Cash flows from investing activities: |  |  |  |
Proceeds from Sale and Maturity of Other Investments | 0 | 0 | 25,000 |
Payments for (Proceeds from) Other Investing Activities | 0 | 0 | (5,000) |
AMPS Proceeds | $ 0 | 19,000 | 0 |
Cash flows from financing activities: |  |  |  |
AMPS Exchange Cash Paid |  | $ 0 | $ (11,000) |

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