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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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