Noncontrolling Interests - Noncontrolling Interest Summary (Parenthetical) (Detail) - shares shares in Millions	6 Months Ended	12 Months Ended
Jun. 30, 2021	Dec. 31, 2020
Long Term Incentive Plan Units [Member]
Minority Interest [Line Items]
Vested LTIP Units	4.0	3.9
Class A Common [Member]
Minority Interest [Line Items]
Outstanding limited partnership units, exchanged	8.0	8.0
Units outstanding	8.6	8.6
Common Unit [Member]
Minority Interest [Line Items]
Outstanding limited partnership units, exchanged	8.2	8.2
Other Consolidated Entities [Member]
Minority Interest [Line Items]
Outstanding limited partnership units, exchanged	0.3	0.3
Other Consolidated Entities [Member] \| Common Stock [Member]
Minority Interest [Line Items]
Outstanding limited partnership units	2.0	2.0

Outstanding common limited partnership units converted into cash or common shares.

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- Definition

Share based compensation arrangement by share based payment award equity instruments other than options vested LTIP units.

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

The number of each class of partnership units outstanding at the balance sheet date. Units represent shares of ownership of the general, limited, and preferred partners.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-04.16(a))
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
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-Subparagraph (SAB TOPIC 4.F)
-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187171-122770

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- Definition

The number of units converted into shares of each class of partners' capital account. Units represent shares of ownership of the general, limited, and preferred partners.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
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