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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, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2019
Stock Transactions Parenthetical Disclosures [Abstract] |  |  |  |  |
Redemptions, Number of Units | 35 | 73 | 97 | 1,203 | 1,408
Repurchases, Number of Shares |  |  |  | 233 | 233
Total Number of Units Redeemed or Shares Repurchased |  |  |  |  | 1,641
Redemptions, Weighted Average Price Paid per Unit or Share | $ 5.57 | $ 5.24 | $ 5.45 | $ 6.00 | $ 5.91
Repurchases, Weighted Average Price Paid per Unit or Shares |  |  |  | $ 5.30 | 5.30
Total Redemptions and Repurchases, Weighted Average Price Paid per Unit or Shares |  |  |  |  | $ 5.82
Total Redemptions and Repurchases, Approximate Dollar Value of Units and Shares That May Yet Be Redeemed/Purchased Under the Program | $ 256,691 |  |  |  | $ 256,691

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