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Stock Transactions and Unit Redemptions - Changes in Shares of Class A Common Stock Outstanding (Detail) - shares | 1 Months Ended | 3 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2019 | Mar. 31, 2018
Share issuances: |  |  |
Treasury stock repurchases | (233,172) | (233,172) |
Class A Common Stock [Member] |  |  |
Class of Stock [Line Items] |  |  |
Shares outstanding at beginning of period |  | 291,474,768 | 256,968,372
Share issuances: |  |  |
Redemptions/Exchanges of limited partnership interests |  | 1,820,588 | 2,787,190
Vesting of restricted stock units (RSUs) |  | 240,335 | 280,884
Acquisition related issuances |  | 18,217 | 317,096
Other issuances of Class A common stock |  | 61,642 | 22,644
Issuance of Class A common stock for general corporate purposes |  |  | 17,923,714
Deferred stock awards |  |  | 979,344
Treasury stock repurchases |  | (233,172) | 0
Shares outstanding at end of period | 293,382,378 | 293,382,378 | 279,279,244

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