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Real Estate - Real Estate Under Development and Construction in Progress - Additional Information (Details) - property	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Number of unconsolidated project in development		1
Number of properties under development	4	5
Fund Portfolio | Fund IV
Property, Plant and Equipment [Line Items]
Number of unconsolidated project in development		4
Number of projects put into service during period		3
Number of properties under development	1	1
Core Portfolio
Property, Plant and Equipment [Line Items]
Number of projects put into service during period	1	1
Number of properties under development	1	2

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- Definition

Number of real estate projects put into service during period.

+ References

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+ Details

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- Definition

Number of real estate properties under development.

+ References

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- Definition

Number of unconsolidated real estate project in development.

+ References

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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.

+ Details

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