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Stock Transactions and Unit Redemptions - Gross Unit Redemptions and Share Repurchases of Class A Common Stock Table Footnote (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Class of Stock [Line Items] |  |  |  |
Weighted-average price for redemption of limited partnership units (in dollars per share) | $ 4.47 | $ 2.81 | $ 5.83 |
Aggregate purchase price of Class A common stock |  |  | $ 227,052 | $ 6
Limited Partnership |  |  |  |
Class of Stock [Line Items] |  |  |  |
Redeemed limited partnership units (in shares) | 16 | 1,500 | 4,700 | 1,800
Aggregate redemption price of limited partnership units | $ 71 | $ 4,100 | $ 27,400 | $ 5,400
Weighted-average price for redemption of founding/working partner units (in dollars per share) |  |  |  | $ 3.02
FPUs |  |  |  |
Class of Stock [Line Items] |  |  |  |
Redeemed limited partnership units (in shares) | 57 | 27 | 100 | 28
Aggregate redemption price of limited partnership units | $ 302 | $ 73 | $ 500 | $ 77
Weighted-average price for redemption of founding/working partner units (in dollars per share) | $ 5.33 | $ 2.74 | $ 4.75 | $ 2.75
Class A Common Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common stock, shares issued for redemption/cancellation of units (in shares) | 5,800 | 500 | 21,200 | 2,600
Common stock, shares issued for exchange of units | 2,900 | 1,300 | 28,800 | 3,100
Stock repurchased during period (in shares) | 24,400 | 2 | 41,900 | 2
Aggregate purchase price of Class A common stock | $ 126,800 | $ 6 | $ 234,600 | $ 6
Weighted-average price of Class A common stock (in dollars per share) | $ 5.19 | $ 2.58 | $ 5.59 | $ 2.58

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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=120397183&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=120397183&loc=d3e187171-122770 + Details
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