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Stock Transactions and Unit Redemptions - Unit Redemption and Share Repurchase Activity (Detail)
 3 Months Ended
Mar. 31, 2018
USD ($)
$ / shares
shares
Stock Transactions Parenthetical Disclosures [Abstract]  
Redemptions, Number of Units | shares 1,723,654
Total Redemptions and Repurchases | shares 1,723,654
Redemptions, Average Price Paid per Unit | $ / shares $ 14.34
Total Redemptions and Repurchases | $ / shares $ 14.34
Total Redemptions and Repurchases, Approximate Dollar Value of Units and Shares That May Yet Be Redeemed/Purchased Under the Plan | $ $ 172,167,800