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Real Estate Assets (Properties) (Details)	12 Months Ended
	Dec. 31, 2015 ft² Counterparty_Investment Property
Real Estate And Accumulated Depreciation [Line Items]
Number of limited partnerships in which the company is sole General Partner | Counterparty_Investment	3
Industrial Properties [Member]
Real Estate And Accumulated Depreciation [Line Items]
Number of properties	2
Office Properties [Member]
Real Estate And Accumulated Depreciation [Line Items]
Number of properties	18
Office/Industrial Properties [Member]
Real Estate And Accumulated Depreciation [Line Items]
Rentable square feet | ft²	1,614,000
Retail Properties [Member]
Real Estate And Accumulated Depreciation [Line Items]
Number of properties	6
Rentable square feet | ft²	236,000
Residential Properties [Member]
Real Estate And Accumulated Depreciation [Line Items]
Number of properties	64
Number of limited partnerships in which the company is sole General Partner | Counterparty_Investment	3
Number of Limited Liability Companies	1

X

- Definition

Number of limited liability companies.

+ References

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+ Details

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- Definition

The number of limited partnerships in which the company is the sole General Partner.

+ References

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X

- Definition

Area of a real estate property.

+ References

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+ Details

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X

- Definition

The number of real estate properties owned as of the balance sheet date.

+ 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.

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- Details

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