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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
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2020
Stock Transactions Parenthetical Disclosures [Abstract]          
Redemptions, Number of Units 720 1,481 103 235 2,539
Repurchases, Number of Shares   2     2
Total Number of Units Redeemed or Shares Repurchased         2,541
Redemptions, Weighted Average Price Paid per Unit or Share $ 1.78 $ 2.80 $ 3.05 $ 4.30 $ 2.67
Repurchases, Weighted Average Price Paid per Unit or Shares   $ 2.58     2.58
Total Redemptions and Repurchases, Weighted Average Price Paid per Unit or Shares         $ 2.67
Total Redemptions and Repurchases, Approximate Dollar Value of Units and Shares That May Yet Be Redeemed/Purchased Under the Program $ 249,908       $ 249,908