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Stock Transactions and Unit Redemptions - Gross Unit Redemptions and Share Repurchases of Class A Common Stock (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	1 Months Ended			3 Months Ended		6 Months Ended
	Jun. 30, 2021	May 31, 2021	Apr. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2021
Stock Transactions, Parenthetical Disclosures [Abstract]
Redemptions (in shares)				4,715	20	4,735
Repurchases (in shares)	15,522	1,018	2		965	17,507
Total Redemptions and Repurchases (in shares)						22,242
Redemptions, Weighted Average Price Paid per Unit or Share (in dollars per share)				$ 5.82	$ 4.40	$ 5.82
Repurchases, Weighted Average Price Paid per Unit or Shares (in dollars per share)	$ 6.29	$ 5.59	$ 5.29		$ 4.56	6.16
Total Redemptions and Repurchases, Weighted Average Price Paid per Unit or Shares (in dollars per share)						$ 6.08
Total Redemptions and Repurchases, Approximate Dollar Value of Units and Shares That May Yet Be Redeemed/Purchased Under the Program	$ 114,584			$ 114,584		$ 114,584