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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Class of Stock [Line Items] |  |  |  |
Weighted-average price for redemption of limited partnership units (in dollars per share) | $ 5.84 | $ 3.05 | $ 5.83 | $ 3.92
Aggregate purchase price of Class A common stock |  |  | $ 107,783 | $ 0
Limited Partnership |  |  |  |
Class of Stock [Line Items] |  |  |  |
Redeemed limited partnership units (in shares) | 4,700 | 100 | 4,700 | 300
Aggregate redemption price of limited partnership units | $ 27,300 | $ 300 | $ 27,300 | $ 1,300
FPUs |  |  |  |
Class of Stock [Line Items] |  |  |  |
Redeemed limited partnership units (in shares) | 44 | 1 | 51 | 1
Aggregate redemption price of limited partnership units | $ 181 | $ 4 | $ 209 | $ 4
Weighted-average price for redemption of founding/working partner units (in dollars per share) | $ 4.06 | $ 3.07 | $ 4.11 | $ 3.07
Class A Common Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common stock, shares issued for redemption/cancellation of units (in shares) | 13,800 | 700 | 15,400 | 2,100
Common stock, shares issued for exchange of units | 16,800 | 1,300 | 25,900 | 1,800
Stock repurchased during period (in shares) | 16,500 |  | 17,500 |
Aggregate purchase price of Class A common stock | $ 103,400 |  | $ 107,800 |
Weighted-average price of Class A common stock (in dollars per share) | $ 6.25 |  | $ 6.16 |

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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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