Noncontrolling Interests - Noncontrolling Interest Summary (Parenthetical) (Detail) - shares shares in Millions	9 Months Ended	12 Months Ended
Sep. 30, 2018	Dec. 31, 2017
DCT Transaction [Member]
Noncontrolling Interest [Line Items]
Limited partnership units, issued	3.6
Class A Common [Member]
Noncontrolling Interest [Line Items]
Outstanding limited partnership units, exchanged	8.4	8.5
Units outstanding	8.8	8.9
Common Unit [Member]
Noncontrolling Interest [Line Items]
Outstanding limited partnership units, exchanged	7.3	4.1
Other Consolidated Entities [Member]
Noncontrolling Interest [Line Items]
Outstanding limited partnership units, exchanged	0.9	1.0
Other Consolidated Entities [Member] \| Common Stock [Member]
Noncontrolling Interest [Line Items]
Outstanding limited partnership units	0.9	1.0

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

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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

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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

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- Definition

Change in the number of units for each class of partners' capital accounts during the year due to acquisitions. Partners include general, limited and preferred partners.

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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.

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