Condensed Consolidated Statements of Changes in Equity (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Dividends declared per share of common stock	$ 0.14	$ 0.18
Dividends declared and paid per share of common stock	$ 0.14	$ 0.18
Repurchase of Class A common stock, shares	233,172
Class A Common Stock [Member]
Equity-based compensation, shares	240,335	280,884
Grant of exchangeability and redemption of limited partnership interests, shares	1,820,588	2,787,190
Issuance of Class A common stock (net of costs), shares	61,642	18,925,702
Repurchase of Class A common stock, shares	233,172	0
Issuance of Class A common stock and RSUs for acquisitions, shares	18,217	317,096
Class A Common Stock [Member] | Smith Mack [Member]
Issuance of Class A common stock and RSUs for acquisitions, shares	18,217	317,096
Class A Common Stock [Member] | Partnership Units [Member]
Redemption of FPUs	2,300	5,403