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Stock Transactions and Unit Redemptions - Schedule of Share Repurchase Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Class of Stock            
Shares repurchased (in shares) 10,029,425     10,029,425   5,498,228
Common Class A            
Class of Stock            
Gross units redeemed (shares) 167,894 0   167,894    
Treasury stock repurchases (in shares) 3,613,098 879,243 0 4,492,341  
Shares repurchased (in shares) 4,660,235     4,660,235    
Average price of units redeemed (in dollars per share) $ 11.91 $ 0   $ 11.91    
Average price paid per unit or share (in dollars per share) $ 12.81 $ 10.58   12.36    
Average Price Paid (in dollars per share)       $ 12.34    
Approximate Dollar Value of Units and Shares That May Yet Be Repurchased/ Purchased Under the  Program $ 342,365     $ 342,365