Earnings Per Share and Weighted-Average Shares Outstanding - Additional Information (Detail) - shares shares in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Antidilutive Securities Excluded fom Computation of Earnings Per Share
Anti-dilutive securities excluded from computation of fully diluted earnings per share amount (in shares)	9.2	61.8	6.0	85.4
Limited Partnership Units
Antidilutive Securities Excluded fom Computation of Earnings Per Share
Anti-dilutive securities excluded from computation of fully diluted earnings per share amount (in shares)		61.7		84.9
Restricted Stock Units (RSUs)
Antidilutive Securities Excluded fom Computation of Earnings Per Share
Anti-dilutive securities excluded from computation of fully diluted earnings per share amount (in shares)		0.1		0.5