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Net Income Per Common Unit - Additional Information (Detail) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Jun. 30, 2018	Jul. 16, 2019	Apr. 16, 2018
Unit Repurchase Program [Line Items]
Amount remaining available for repurchases	$ 115,400,000	$ 115,400,000
Common stock repurchased, units	7,000,000.0	8,500,000	2,200,000
Common stock repurchased, cost	$ 290,900,000	$ 343,100,000	$ 71,700,000
Common Class A
Unit Repurchase Program [Line Items]
Amount authorized to repurchase under unit repurchase program				$ 1,000,000,000.0
Blackstone
Unit Repurchase Program [Line Items]
Amount authorized to repurchase under unit repurchase program					$ 1,000,000,000.0

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- Definition

Disclosure of information about unit repurchase program, including, but not limited to, average cost per share, description of unit repurchase program, units repurchased and amount available for repurchase.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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