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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

X

- Definition

Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK).

+ References

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