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Stockholders' Equity - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Equity [Line Items] |  |  |  |  |  |  |
Series A preferred stock pays a cumulative dividend |  |  |  |  | $ 1.00 | $ 1.00 | $ 1.00
Received distributions from the earnings of subsidiaries |  |  |  |  | $ 151,000,000.0 | $ 121,300,000 | $ 96,600,000
Series A [Member] |  |  |  |  |  |  |
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 |
UPCIC [Member] |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |
Capital contributions to affiliates |  |  |  |  | 114,000,000.0 | 0 | 0
APPCIC [Member] |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |
Capital contributions to affiliates |  |  |  |  | $ 0 | $ 0 | $ 0

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