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Debt - Summary of Consolidated Indebtedness (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 1,438,386 | $ 1,505,671
Mortgage and other notes payable, net | 909,174 | 1,055,728
Unsecured notes payable, net | 473,735 | 432,990
Unsecured line of credit | 41,500 | 0
Net unamortized debt issuance costs | (14,833) | (18,289)
Unamortized fair market value of assumed debt | 856 | 1,336
Total indebtedness | 1,424,409 | 1,488,718
Letters of credit, outstanding amount | 19,700 | 11,300
Total Debt - Fixed and Effectively Fixed Rate |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | 899,650 | 860,486
Total Debt - Variable Rate |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | 538,736 | 645,185
Total Debt - Variable Rate Fixed and Effectively Fixed Rate During Period |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | 504,018 | 365,343
Variable-rate debt that subject to interest cap agreements |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | 141,100 | 186,600
Mortgages |  |
Debt Instrument [Line Items] |  |
Mortgage and other notes payable, net | 909,174 | 1,055,728
Net unamortized debt issuance costs | (12,943) | (16,642)
Unamortized fair market value of assumed debt | $ 856 | 1,336
Mortgages | LIBOR |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 3.90% |
Unsecured Debt |  |
Debt Instrument [Line Items] |  |
Unsecured notes payable, net | $ 473,735 | 432,990
Net unamortized debt issuance costs | (1,890) | (1,646)
Line of Credit |  |
Debt Instrument [Line Items] |  |
Unsecured line of credit | $ 41,500 | 0
Core Portfolio | Variable Rate Debt | LIBOR | Minimum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 1.65% |
Core Portfolio | Variable Rate Debt | LIBOR | Maximum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 1.90% |
Core Portfolio | Variable Rate Unsecured Term Loans - Swapped | LIBOR | Minimum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 1.30% |
Core Portfolio | Variable Rate Unsecured Term Loans - Swapped | LIBOR | Maximum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 1.60% |
Core Portfolio | Mortgages |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 254,022 | 317,125
Core Portfolio | Mortgages | Fixed Rate |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 179,870 | $ 234,875
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 | 5.89% | 5.89%
Core Portfolio | Mortgages | Variable Rate - Swapped |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 74,152 | $ 82,250
Core Portfolio | Mortgages | Variable Rate - Swapped | Minimum |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 1.71% | 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 |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 300,000 | $ 300,000
Core Portfolio | Unsecured Debt | Unsecured Term Loans |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 0 | $ 51,194
Core Portfolio | Unsecured Debt | Unsecured Term Loans | LIBOR | Minimum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 1.30% | 1.30%
Core Portfolio | Unsecured Debt | Unsecured Term Loans | LIBOR | Maximum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 1.60% | 1.60%
Core Portfolio | Unsecured Debt | Variable Rate Unsecured Term Loans - Swapped |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 300,000 | $ 248,806
Core Portfolio | Unsecured Debt | Variable Rate Unsecured Term Loans - Swapped | Minimum |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 1.24% | 1.24%
Core Portfolio | Unsecured Debt | Variable Rate Unsecured Term Loans - Swapped | Maximum |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 3.77% | 3.77%
Core Portfolio | Line of Credit | Unsecured Line of Credit |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 18,048 | $ 0
Core Portfolio | Line of Credit | Unsecured Line of Credit | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 1.40% | 1.40%
Core Portfolio | Line of Credit | Unsecured Line of Credit - Swapped |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 23,452 | $ 0
Core Portfolio | Line of Credit | Unsecured Line of Credit - Swapped | LIBOR | Minimum |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 1.24% |
Core Portfolio | Line of Credit | Unsecured Line of Credit - Swapped | LIBOR | Maximum |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 3.77% |
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 | $ 224,822 | 412,291
Fund II | Fund Portfolio | Mortgages | Fixed Rate |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 205,262 | $ 249,762
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% | 5.80%
Fund II | Fund Portfolio | Mortgages | Variable Rate - Swapped |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 2.88% | 2.88%
Long-term debt, gross | $ 19,560 | $ 19,779
Fund II | Fund Portfolio | Mortgages | Variable Rate Debt |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 0 | $ 142,750
Fund II | Fund Portfolio | Mortgages | Variable Rate Debt | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 1.39% |
Fund II | Fund Portfolio | Mortgages | Variable Rate Debt | LIBOR | Minimum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate |  | 0.62%
Fund II | Fund Portfolio | Mortgages | Variable Rate Debt | LIBOR | Maximum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate |  | 2.50%
Fund II | Fund Portfolio | Unsecured Debt | Unsecured Notes Payable |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 31,500 | $ 0
Fund II | Fund Portfolio | Unsecured Debt | Unsecured Notes Payable | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 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 | $ 65,866 | $ 83,467
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 | 1.70% |
Fund IV | Fund Portfolio | Variable Rate Debt | 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 | $ 347,938 | $ 258,151
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] |  |
Interest rate, stated percentage | 1.78% | 1.78%
Long-term debt, gross | $ 86,851 | $ 14,509
Fund IV | Fund Portfolio | Mortgages | Variable Rate Debt |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 250,584 | $ 233,139
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 | $ 134,636
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 | Unsecured Debt | Subscription Line | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 1.60% |
Fund V | Fund Portfolio | Mortgages | Variable Rate Debt |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 28,613 | $ 0
Fund V | Fund Portfolio | Mortgages | Variable Rate Debt | LIBOR |  |
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 | $ 103,300 | $ 0
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 | $ 11,300

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