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v3.19.3.a.u2

Stockholders' Equity - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Equity [Line Items] |  |  |  |  |  |  |
Series A preferred stock pays a cumulative dividend |  |  |  |  | $ 1.00 | $ 1.00 | $ 1.00
Received distributions from the earnings of subsidiaries |  |  |  |  | $ 121,300,000 | $ 96,600,000 | $ 122,200,000
Capital contributions to subsidiaries |  |  |  |  | 0 | 0 | $ 0
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] |  |  |  |  |  |  |
Statutory capital contribution | $ 30,000,000.0 |  |  |  | $ 30,000,000.0 |  |

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