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Subsequent Events - Additional Information (Detail) - USD ($)		12 Months Ended
	Feb. 03, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Mar. 04, 2021
Subsequent Event [Line Items]
Common stock dividends per share declared		$ 0.09	$ 0.09	$ 0.09
Minimum [Member]
Subsequent Event [Line Items]
Collateral value required to be maintained		$ 9,000,000.0
Subsequent Event [Member]
Subsequent Event [Line Items]
Dividend declaration date	Feb. 03, 2021
Common stock dividends per share declared	$ 0.09
Dividend record date	Feb. 18, 2021
Dividend payment date	Mar. 04, 2021
Quarterly dividend payable, aggregate amount					$ 4,400,000
Subsequent Event [Member] | Maximum [Member]
Subsequent Event [Line Items]
Collateral value required to be maintained	$ 15,000,000.0

X

- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
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- Definition

Amount of assets pledged to secure a debt instrument.

+ References

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- Definition

Date the declared dividend will be paid, in CCYY-MM-DD format.

+ References

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- Definition

Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding.

+ References

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- Definition

Date the dividend to be paid was declared, in CCYY-MM-DD format.

+ References

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- Definition

Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format.

+ References

No definition available.

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

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