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Stockholders' Equity - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Equity [Line Items] |  |  |  |  |  |  |
Series A preferred stock pays a cumulative dividend |  |  |  |  | $ 1.00 | $ 1.00 | $ 1.00
Dividend paid to immediate parent company |  |  |  |  | $ 164,100,000 | $ 231,900,000 | $ 149,900,000
UPCIC |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |
Dividend paid to immediate parent company |  |  |  |  | 0 | 0 |
Capital contribution to subsidiaries |  |  |  |  | 72,000,000 | 84,000,000 | 92,000,000
APPCIC |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |
Dividend paid to immediate parent company |  |  |  |  | 0 | 0 |
Capital contribution to subsidiaries |  |  |  |  | 0 | 3,000,000 | $ 0
Series A |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |
Series A preferred stock pays a cumulative dividend | $ 0.25 | $ 0.25 | $ 0.25 | $ 0.25 |  |  |
Preferred stock aggregate dividends |  |  |  |  | $ 10,000 | $ 10,000 |

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- Definition Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480008/505-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 2 -SubTopic 405 -Topic 942 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481071/942-405-45-2 + Details
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