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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, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2020
Jun. 30, 2019
Stock Transactions Parenthetical Disclosures [Abstract]        
Redemptions, Number of Units 103,000 235,000 338,000  
Repurchases, Number of Shares       233,172
Total Number of Units Redeemed or Shares Repurchased     338,000  
Redemptions, Weighted Average Price Paid per Unit or Share $ 3.05 $ 4.30 $ 3.92  
Total Redemptions and Repurchases, Weighted Average Price Paid per Unit or Shares     $ 3.92  
Total Redemptions and Repurchases, Approximate Dollar Value of Units and Shares That May Yet Be Redeemed/Purchased Under the Program $ 255,365   $ 255,365