Equity and Redeemable Non-controlling Interest - Schedule of Company's Outstanding Shares of Common Stock (Parenthetical) (Detail) - Class I Shares [Member] $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($)
Class Of Stock [Line Items]
Independent directors' restricted stock grant, value	$ 0.1
Shares vesting, month and year	2021-08