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Stock Transactions and Unit Redemptions - Schedule of Share Repurchase Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended			3 Months Ended
	Mar. 31, 2021	Feb. 28, 2021	Jan. 31, 2021	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Class of Stock
Shares repurchased (in shares)	6,337,471			6,337,471		5,498,228
Common Class A
Class of Stock
Gross units redeemed (shares)	28,962	0	0
Treasury stock repurchases (in shares)		0	0	879,243	0
Shares repurchased (in shares)	908,205			908,205
Average price of units redeemed (in dollars per share)	$ 11.09	$ 0	$ 0
Average price paid per unit or share (in dollars per share)		$ 0	$ 0	$ 10.57
Average Price Paid (in dollars per share)				$ 10.59
Approximate Dollar Value of Units and Shares That May Yet Be Repurchased/ Purchased Under the  Program	$ 390,386			$ 390,386

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