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Earnings Per Share - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Schedule Of Earnings Per Share [Line Items]
Forward equity agreement	1,700,000			1,700,000
Performance Restricted Stock Units [Member]
Schedule Of Earnings Per Share [Line Items]
Mark-to-market adjustment			$ (0.3)	$ (5.6)	$ 1.6
Common shares, shares issued		570,295

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Mark to market adjustment.

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Earnings Per Share Line Items.

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Number, before forfeiture, of shares issued under share-based payment arrangement. Excludes employee stock ownership plan (ESOP).

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