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v3.19.3.a.u2

Stock Transactions and Unit Redemptions - Changes in Shares of Class A Common Stock Outstanding (Detail) - shares | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share issuances: |  |  |  |
Exchange from Class A to Class B common stock |  |  | (11,036,273) |
Treasury stock repurchases | (233,000) | (233,000) |  |
Forfeitures of restricted Class A common stock |  | (22,000) | (232,000) |
Class A Common Stock [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares outstanding at beginning of period | 291,475,000 | 291,475,000 | 256,968,000 |
Share issuances: |  |  |  |
Redemption/exchanges of limited partnership interests |  | 15,008,431 | 18,287,721 | 9,179,295
Issuance of Class A common stock for general corporate purposes |  |  | 24,924,000 |
Deferred stock awards |  |  | 979,000 |
Vesting of restricted stock units (RSUs) |  | 435,000 | 528,000 |
Acquisitions |  | 1,039,000 | 1,744,000 |
Other issuances of Class A common stock |  | 213,000 | 101,000 |
Exchange from Class A to Class B common stock |  |  | (11,036,000) |
Treasury stock repurchases |  | (233,172) | (788,788) | (1,386,769)
Forfeitures of restricted Class A common stock |  | (22,000) | (231,602) | (183,246)
Shares outstanding at end of period |  | 307,915,000 | 291,475,000 | 256,968,000

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