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Debt - Summary of Consolidated Indebtedness (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 1,467,712 | $ 1,438,386
Mortgage and other notes payable, net | 911,527 | 909,174
Unsecured notes payable, net | 529,756 | 473,735
Unsecured line of credit | 14,000 | 41,500
Net unamortized debt issuance costs | (13,259) | (14,833)
Unamortized fair market value of assumed debt | 830 | 856
Total indebtedness | 1,455,283 | 1,424,409
Letters of credit, outstanding amount | 19,700 | 19,700
Total Debt - Fixed and Effectively Fixed Rate |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | 915,483 | 899,650
Total Debt - Variable Rate |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | 552,229 | 538,736
Total Debt - Variable Rate Fixed and Effectively Fixed Rate During Period |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | 520,200 | 504,000
Variable-rate debt that subject to interest cap agreements |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | 143,800 | 141,100
Mortgages |  |
Debt Instrument [Line Items] |  |
Mortgage and other notes payable, net | 911,527 | 909,174
Net unamortized debt issuance costs | (12,590) | (12,943)
Unamortized fair market value of assumed debt | 830 | 856
Unsecured Debt |  |
Debt Instrument [Line Items] |  |
Unsecured notes payable, net | 529,756 | 473,735
Net unamortized debt issuance costs | (669) | (1,890)
Line of Credit |  |
Debt Instrument [Line Items] |  |
Unsecured line of credit | $ 14,000 | 41,500
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 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 | $ 212,798 | 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 | $ 179,475 | $ 179,870
Core Portfolio | Mortgages | Fixed Rate | Minimum |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 3.88% | 3.88%
Core Portfolio | Mortgages | Fixed Rate | Maximum |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 6.00% | 5.89%
Core Portfolio | Mortgages | Variable Rate - Swapped |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 33,323 | $ 74,152
Core Portfolio | Mortgages | Variable Rate - Swapped | Minimum |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 3.41% | 1.71%
Core Portfolio | Mortgages | Variable Rate - Swapped | Maximum |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 3.77% | 3.77%
Core Portfolio | Unsecured Debt | Variable Rate Unsecured Term Loans - Swapped |  |
Debt Instrument [Line Items] |  |
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% | 1.24%
Core Portfolio | Unsecured Debt | Variable Rate Unsecured Term Loans - Swapped | Maximum |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 4.05% | 3.77%
Core Portfolio | Line of Credit | Unsecured Line of Credit |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 0 | $ 18,048
Core Portfolio | Line of Credit | Unsecured Line of Credit | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate |  | 1.40%
Core Portfolio | Line of Credit | Unsecured Line of Credit - Swapped |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 14,000 | $ 23,452
Core Portfolio | Line of Credit | Unsecured Line of Credit - Swapped | LIBOR | Minimum |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 2.59% | 1.24%
Core Portfolio | Line of Credit | Unsecured Line of Credit - Swapped | LIBOR | Maximum |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 4.15% | 3.77%
Fund Portfolio | Mortgages | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 2.17% |
Fund II | Fund Portfolio | Variable Rate Debt | LIBOR | Minimum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 1.39% |
Fund II | Fund Portfolio | Mortgages |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 224,765 | $ 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%
Fund II | Fund Portfolio | Mortgages | Fixed Rate | Maximum |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 4.75% | 4.75%
Fund II | Fund Portfolio | Mortgages | Variable Rate - Swapped |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 2.88% | 2.88%
Long-term debt, gross | $ 19,503 | $ 19,560
Fund II | Fund Portfolio | Unsecured Debt | Unsecured Notes Payable |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 31,500 | $ 31,500
Fund II | Fund Portfolio | Unsecured Debt | Unsecured Notes Payable | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 1.65% | 1.40%
Fund III | Fund Portfolio | Variable Rate Debt | LIBOR | Maximum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 4.65% |
Fund III | Fund Portfolio | Variable Rate Debt | Prime Rate | Minimum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 0.50% |
Fund III | Fund Portfolio | Mortgages | Variable Rate Debt |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 70,344 | $ 65,866
Fund III | Fund Portfolio | Mortgages | Variable Rate Debt | LIBOR | Maximum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 4.65% | 4.65%
Fund III | Fund Portfolio | Mortgages | Variable Rate Debt | Prime Rate | Minimum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 0.50% | 0.50%
Fund IV | Fund Portfolio | Variable Rate Debt | LIBOR | Minimum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 1.85% |
Fund IV | Fund Portfolio | Variable Rate Debt | LIBOR | Maximum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 2.25% |
Fund IV | Fund Portfolio | Mortgages |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 346,974 | $ 347,938
Fund IV | Fund Portfolio | Mortgages | Fixed Rate |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 10,503 | $ 10,503
Fund IV | Fund Portfolio | Mortgages | Fixed Rate | Minimum |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 3.40% | 3.40%
Fund IV | Fund Portfolio | Mortgages | Fixed Rate | Maximum |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 4.50% | 4.50%
Fund IV | Fund Portfolio | Mortgages | Variable Rate - Swapped |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 86,517 | $ 86,851
Fund IV | Fund Portfolio | Mortgages | Variable Rate - Swapped | LIBOR | Minimum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 3.67% | 1.78%
Fund IV | Fund Portfolio | Mortgages | Variable Rate - Swapped | LIBOR | Maximum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 4.23% | 2.11%
Fund IV | Fund Portfolio | Mortgages | Variable Rate Debt |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 249,954 | $ 250,584
Fund IV | Fund Portfolio | Mortgages | Variable Rate Debt | LIBOR | Minimum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 1.70% | 1.70%
Fund IV | Fund Portfolio | Mortgages | Variable Rate Debt | LIBOR | Maximum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 3.95% | 3.95%
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%
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%
Fund V | Fund Portfolio | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 2.20% |
Fund V | Fund Portfolio | Mortgages |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 68,406 | $ 28,613
Fund V | Fund Portfolio | Mortgages | Variable Rate - Swapped |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 16,900 | 0
Fund V | Fund Portfolio | Mortgages | Variable Rate - Swapped | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 4.61% |
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% |
Fund V | Fund Portfolio | Mortgages | Variable Rate Debt | LIBOR | Maximum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 2.25% |
Fund V | Fund Portfolio | Unsecured Debt | Subscription Line |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 108,100 | $ 103,300
Fund V | Fund Portfolio | Unsecured Debt | Subscription Line | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 1.60% | 1.60%
Revolving Credit Facility | Core Portfolio | Unsecured Debt |  |
Debt Instrument [Line Items] |  |
Letters of credit, outstanding amount | $ 12,300 | $ 12,300

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