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Stock Transactions and Unit Redemptions - Gross Unit Redemptions and Share Repurchases of Class A Common Stock (Parenthetical) (Detail) - USD ($) | 1 Months Ended | 3 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2019 | Mar. 31, 2018
Class of Stock [Line Items] |  |  |
Average price for redemption of limited partnership units |  | $ 6.00 | $ 14.34
Redemptions, number of units |  | 1,202,948 |
Repurchase of Class A common stock, shares Treasury Stock Shares Acquired | 233,172 | 233,172 |
Aggregate purchase price of Class A common stock |  | $ 1,236,000 |
Average price of Class A common stock | $ 5.30 | $ 5.30 |
Class A Common Stock [Member] |  |  |
Class of Stock [Line Items] |  |  |
Repurchase of Class A common stock, shares Treasury Stock Shares Acquired |  | 233,172 | 0
Aggregate purchase price of Class A common stock |  | $ 1,200,000 |
Average price of Class A common stock |  | $ 5.30 |
Class A Common Stock [Member] | Controlled Equity Offerings [Member] |  |  |
Class of Stock [Line Items] |  |  |
Redemptions, number of units |  | 900,000 |
Limited Partnership [Member] |  |  |
Class of Stock [Line Items] |  |  |
Redeemed limited partnership units |  | 1,200,000 | 1,700,000
Aggregate redemption price of limited partnership units |  | $ 7,200,000 | $ 24,600,000
Other Ownership Interest [Member] |  |  |
Class of Stock [Line Items] |  |  |
Redeemed limited partnership units |  | 2,300 | 5,000
Aggregate redemption price of limited partnership units |  | $ 14,100 | $ 74,000
Average price for redemption of founding/working partner units |  | $ 6.11 | $ 13.67

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- Definition Total change in each class of partners' capital accounts during the year due to redemptions and adjustments to redemption value. All partners include general, limited and preferred partners. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 5 -Subparagraph (SAB Topic 4.F) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770 + Details
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