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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			9 Months Ended
	Sep. 30, 2021	Aug. 31, 2021	Jul. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2021
Stock Transactions, Parenthetical Disclosures [Abstract]
Redemptions (in shares)				73	4,715	20	4,808
Repurchases (in shares)	8,534	5,899	10,000		16,542	965	41,940
Total Redemptions and Repurchases (in shares)							46,748
Redemptions, Weighted Average Price Paid per Unit or Share (in dollars per share)				$ 5.14	$ 5.82	$ 4.40	$ 5.81
Repurchases, Weighted Average Price Paid per Unit or Shares (in dollars per share)	$ 5.10	$ 5.64	$ 5.00		$ 6.25	$ 4.56	5.59
Total Redemptions and Repurchases, Weighted Average Price Paid per Unit or Shares (in dollars per share)							$ 5.62
Total Redemptions and Repurchases, Approximate Dollar Value of Units and Shares That May Yet Be Redeemed/Purchased Under the Program	$ 322,835			$ 322,835			$ 322,835