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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			9 Months Ended		12 Months Ended
	Sep. 30, 2018	Aug. 31, 2018	Jul. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Share issuances:
Treasury stock repurchases	(5,574)	(696)	(1,993)		(726,539)		(734,802)
Forfeitures of restricted Class A common stock							(194,000)	(107,000)
Class A Common Stock [Member]
Class of Stock [Line Items]
Shares outstanding at beginning of period			290,909,843	290,909,843		251,057,086	256,968,372	244,869,624	244,869,624
Share issuances:
Issuance of Class A common stock for general corporate purposes							24,923,714
Exchanges of limited partnership interests				2,474,658		1,434,050	9,949,679	6,795,187	9,179,295
Compensation awards							979,344
Acquisition related issuances				78,678		82,907	1,083,150	1,424,690
Vesting of restricted stock units (RSUs)				82,345		42,295	464,019	479,313
Other issuances of Class A common stock				23,767		11,874	72,182	45,490
Treasury stock repurchases				(8,263)		(295,871)	(734,802)	(1,246,365)	(1,386,769)
Forfeitures of restricted Class A common stock				(49,189)		(71,251)	(193,819)	(106,849)	(183,246)
Shares outstanding at end of period	293,511,839			293,511,839	290,909,843	252,261,090	293,511,839	252,261,090	256,968,372

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