Debt - Summary of Consolidated Indebtedness (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Long-term debt, gross	$ 1,491,869	$ 1,438,386
Net unamortized debt issuance costs	(10,919)	(14,833)
Unamortized fair market value of assumed debt	779	856
Mortgage and other notes payable, net	964,796	909,174
Unsecured notes payable, net	488,933	473,735
Unsecured line of credit	28,000	41,500
Total Indebtedness	1,481,729	1,424,409
Fixed Rate
Debt Instrument [Line Items]
Long-term debt, gross	967,667	899,650
Total Debt - Variable Rate
Debt Instrument [Line Items]
Long-term debt, gross	524,202	538,736
Mortgages
Debt Instrument [Line Items]
Net unamortized debt issuance costs	(10,527)	(12,943)
Unamortized fair market value of assumed debt	779	856
Mortgage and other notes payable, net	964,796	909,174
Unsecured Debt
Debt Instrument [Line Items]
Net unamortized debt issuance costs	(392)	(1,890)
Unsecured notes payable, net	488,933	473,735
Line of Credit
Debt Instrument [Line Items]
Unsecured line of credit	$ 28,000	41,500
Core Portfolio \| Minimum
Debt Instrument [Line Items]
Maturity Date	2019-04
Core Portfolio \| Maximum
Debt Instrument [Line Items]
Maturity Date	2020-04
Core Portfolio \| Variable Rate Debt \| LIBOR \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	1.70%
Core Portfolio \| Variable Rate Debt \| LIBOR \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	1.90%
Core Portfolio \| Unsecured Line of Credit \| LIBOR \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	1.35%
Core Portfolio \| Unsecured Notes Payable \| LIBOR \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	1.25%
Core Portfolio \| Mortgages
Debt Instrument [Line Items]
Long-term debt, gross	$ 211,511	254,022
Core Portfolio \| Mortgages \| LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.65%
Core Portfolio \| Mortgages \| Fixed Rate
Debt Instrument [Line Items]
Long-term debt, gross	$ 178,677	$ 179,870
Core Portfolio \| Mortgages \| Fixed Rate \| Minimum
Debt Instrument [Line Items]
Interest rate, stated percentage	3.88%	3.88%
Maturity Date	2024-02
Core Portfolio \| Mortgages \| Fixed Rate \| Maximum
Debt Instrument [Line Items]
Interest rate, stated percentage	6.00%	5.89%
Maturity Date	2035-04
Core Portfolio \| Mortgages \| Variable Rate - Swapped
Debt Instrument [Line Items]
Long-term debt, gross	$ 32,834	$ 74,152
Core Portfolio \| Mortgages \| Variable Rate - Swapped \| Minimum
Debt Instrument [Line Items]
Interest rate, stated percentage	3.41%	3.41%
Maturity Date	2023-01
Core Portfolio \| Mortgages \| Variable Rate - Swapped \| Maximum
Debt Instrument [Line Items]
Interest rate, stated percentage	5.67%	5.67%
Maturity Date	2026-06
Core Portfolio \| Unsecured Debt \| Variable Rate Unsecured Term Loans - Swapped
Debt Instrument [Line Items]
Maturity Date	2023-03
Long-term debt, gross	$ 350,000	$ 300,000
Core Portfolio \| Unsecured Debt \| Variable Rate Unsecured Term Loans - Swapped \| Minimum
Debt Instrument [Line Items]
Interest rate, stated percentage	2.49%	2.54%
Core Portfolio \| Unsecured Debt \| Variable Rate Unsecured Term Loans - Swapped \| Maximum
Debt Instrument [Line Items]
Interest rate, stated percentage	4.05%	3.59%
Core Portfolio \| Line of Credit \| Unsecured Line of Credit
Debt Instrument [Line Items]
Long-term debt, gross	$ 13,324	$ 18,048
Core Portfolio \| Line of Credit \| Unsecured Line of Credit \| LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.35%	1.40%
Maturity Date	2022-03
Core Portfolio \| Line of Credit \| Unsecured Line of Credit - Swapped
Debt Instrument [Line Items]
Maturity Date	2022-03
Long-term debt, gross	$ 14,676	$ 23,452
Core Portfolio \| Line of Credit \| Unsecured Line of Credit - Swapped \| LIBOR \| Minimum
Debt Instrument [Line Items]
Interest rate, stated percentage	4.15%	4.20%
Core Portfolio \| Line of Credit \| Unsecured Line of Credit - Swapped \| LIBOR \| Maximum
Debt Instrument [Line Items]
Interest rate, stated percentage	5.02%	5.07%
Fund Portfolio \| Mortgages \| LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.99%
Fund II \| Fund Portfolio
Debt Instrument [Line Items]
Maturity Date	2020-05
Fund II \| Fund Portfolio \| Variable Rate Debt \| LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.39%
Fund II \| Fund Portfolio \| Mortgages
Debt Instrument [Line Items]
Long-term debt, gross	$ 224,647	$ 224,822
Fund II \| Fund Portfolio \| Mortgages \| Fixed Rate
Debt Instrument [Line Items]
Long-term debt, gross	$ 205,262	$ 205,262
Fund II \| Fund Portfolio \| Mortgages \| Fixed Rate \| Minimum
Debt Instrument [Line Items]
Interest rate, stated percentage	1.00%	1.00%
Maturity Date	2020-05
Fund II \| Fund Portfolio \| Mortgages \| Fixed Rate \| Maximum
Debt Instrument [Line Items]
Interest rate, stated percentage	4.75%	4.75%
Maturity Date	2042-08
Fund II \| Fund Portfolio \| Mortgages \| Variable Rate - Swapped
Debt Instrument [Line Items]
Interest rate, stated percentage	4.27%	4.27%
Maturity Date	2021-11
Long-term debt, gross	$ 19,385	$ 19,560
Fund II \| Fund Portfolio \| Unsecured Debt \| Variable Rate Debt \| LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.65%	1.40%
Fund II \| Fund Portfolio \| Unsecured Debt \| Unsecured Notes Payable
Debt Instrument [Line Items]
Long-term debt, gross	$ 37,000	$ 31,500
Fund II \| Fund Portfolio \| Unsecured Debt \| Unsecured Notes Payable \| LIBOR
Debt Instrument [Line Items]
Maturity Date	2020-09
Fund III \| Fund Portfolio
Debt Instrument [Line Items]
Maturity Date	2020-07
Fund III \| Fund Portfolio \| Variable Rate Debt \| LIBOR \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	2.65%
Fund III \| Fund Portfolio \| Variable Rate Debt \| LIBOR \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	4.65%
Fund III \| Fund Portfolio \| Mortgages \| Variable Rate Debt
Debt Instrument [Line Items]
Long-term debt, gross	$ 75,393	$ 65,866
Fund III \| Fund Portfolio \| Mortgages \| Variable Rate Debt \| LIBOR \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	2.65%
Maturity Date	2020-06
Fund III \| Fund Portfolio \| Mortgages \| Variable Rate Debt \| LIBOR \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	4.65%	4.65%
Maturity Date	2021-12
Fund III \| Fund Portfolio \| Mortgages \| Variable Rate Debt \| Prime Rate \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate		0.50%
Fund IV \| Fund Portfolio
Debt Instrument [Line Items]
Maturity Date	2021-02
Fund IV \| Fund Portfolio \| LIBOR \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	1.60%
Fund IV \| Fund Portfolio \| LIBOR \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	3.95%
Fund IV \| Fund Portfolio \| Mortgages
Debt Instrument [Line Items]
Long-term debt, gross	$ 324,917	$ 347,938
Fund IV \| Fund Portfolio \| Mortgages \| Fixed Rate
Debt Instrument [Line Items]
Long-term debt, gross	$ 8,189	$ 10,503
Fund IV \| Fund Portfolio \| Mortgages \| Fixed Rate \| Minimum
Debt Instrument [Line Items]
Interest rate, stated percentage	3.40%	3.40%
Maturity Date	2025-10
Fund IV \| Fund Portfolio \| Mortgages \| Fixed Rate \| Maximum
Debt Instrument [Line Items]
Interest rate, stated percentage	4.50%	4.50%
Maturity Date	2026-06
Fund IV \| Fund Portfolio \| Mortgages \| Variable Rate - Swapped
Debt Instrument [Line Items]
Long-term debt, gross	$ 72,074	$ 86,851
Fund IV \| Fund Portfolio \| Mortgages \| Variable Rate - Swapped \| Minimum
Debt Instrument [Line Items]
Maturity Date	2019-05
Fund IV \| Fund Portfolio \| Mortgages \| Variable Rate - Swapped \| Maximum
Debt Instrument [Line Items]
Maturity Date	2022-12
Fund IV \| Fund Portfolio \| Mortgages \| Variable Rate - Swapped \| LIBOR \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	3.67%	3.67%
Fund IV \| Fund Portfolio \| Mortgages \| Variable Rate - Swapped \| LIBOR \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	4.23%	4.23%
Fund IV \| Fund Portfolio \| Mortgages \| Variable Rate Debt
Debt Instrument [Line Items]
Long-term debt, gross	$ 244,654	$ 250,584
Fund IV \| Fund Portfolio \| Mortgages \| Variable Rate Debt \| LIBOR \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	1.60%	1.70%
Maturity Date	2018-08
Fund IV \| Fund Portfolio \| Mortgages \| Variable Rate Debt \| LIBOR \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	3.95%	3.95%
Maturity Date	2021-08
Fund IV \| Fund Portfolio \| Unsecured Debt \| Term Loan / Subscription Facility
Debt Instrument [Line Items]
Long-term debt, gross	$ 40,825	$ 40,825
Fund IV \| Fund Portfolio \| Unsecured Debt \| Term Loan / Subscription Facility \| LIBOR \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	1.65%	1.65%
Maturity Date	2018-12
Fund IV \| Fund Portfolio \| Unsecured Debt \| Term Loan / Subscription Facility \| LIBOR \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	2.75%	2.75%
Maturity Date	2019-10
Fund V \| Fund Portfolio \| LIBOR \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	2.15%
Fund V \| Fund Portfolio \| LIBOR \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	2.25%
Fund V \| Fund Portfolio \| Mortgages
Debt Instrument [Line Items]
Long-term debt, gross	$ 138,076	$ 28,613
Fund V \| Fund Portfolio \| Mortgages \| Variable Rate - Swapped
Debt Instrument [Line Items]
Long-term debt, gross	$ 86,570	0
Fund V \| Fund Portfolio \| Mortgages \| Variable Rate - Swapped \| Minimum
Debt Instrument [Line Items]
Maturity Date	2021-02
Fund V \| Fund Portfolio \| Mortgages \| Variable Rate - Swapped \| Maximum
Debt Instrument [Line Items]
Maturity Date	2021-06
Fund V \| Fund Portfolio \| Mortgages \| Variable Rate - Swapped \| LIBOR \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	4.61%
Fund V \| Fund Portfolio \| Mortgages \| Variable Rate - Swapped \| LIBOR \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	4.78%
Fund V \| Fund Portfolio \| Mortgages \| Variable Rate Debt
Debt Instrument [Line Items]
Long-term debt, gross	$ 51,506	$ 28,613
Fund V \| Fund Portfolio \| Mortgages \| Variable Rate Debt \| LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate		2.25%
Fund V \| Fund Portfolio \| Mortgages \| Variable Rate Debt \| LIBOR \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	2.15%
Maturity Date	2020-10
Fund V \| Fund Portfolio \| Mortgages \| Variable Rate Debt \| LIBOR \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	2.25%
Maturity Date	2021-01
Fund V \| Fund Portfolio \| Unsecured Debt \| Subscription Line
Debt Instrument [Line Items]
Long-term debt, gross	$ 61,500	$ 103,300
Fund V \| Fund Portfolio \| Unsecured Debt \| Subscription Line \| LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.60%	1.60%
Maturity Date	2020-05

Debt instrument, maturity month and year.

No definition available.

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ 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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- Definition

Amount, after accumulated amortization, of debt premium.

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- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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- Definition

Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer).

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