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Stock Transactions and Unit Redemptions - Gross Unit Redemptions and Share Repurchases of Class A Common Stock (Detail)
 1 Months Ended 3 Months Ended
Mar. 31, 2019
USD ($)
$ / shares
shares
Mar. 31, 2019
USD ($)
$ / shares
shares
Stock Transactions Parenthetical Disclosures [Abstract]    
Redemptions, Number of Units | shares   1,202,948
Repurchases, Number of Shares | shares 233,172 233,172
Total Number of Units Redeemed or Shares Repurchased | shares   1,436,120
Redemptions, Average Price Paid per Unit or Share | $ / shares   $ 6.00
Repurchases, Average Price Paid per Unit or Shares | $ / shares $ 5.30 5.30
Total Redemptions and Repurchases, Average Price Paid per Unit or Shares | $ / shares   $ 5.88
Total Redemptions and Repurchases, Approximate Dollar Value of Units and Shares That May Yet Be Redeemed/Purchased Under the Plan | $ $ 257,796,140 $ 257,796,140