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Organization and Summary of Significant Accounting Policies (Textual) (Details) ft² in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) shares | Dec. 31, 2013 USD ($) | Dec. 31, 2015 shares | Dec. 31, 2015 | Dec. 31, 2015 Property | Dec. 31, 2015 Communities | Dec. 31, 2015 ft²
Real Estate Properties |  |  |  |  |  |  |  |
General partners' capital account, units outstanding | shares |  | 75,267,675 |  | 75,408,571 |  |  |  |
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest | 94.80% | 94.70% |  |  |  |  |  |
Number of Real Estate Properties |  |  |  |  |  | 254 | 254 |
Advertising expenses | $ 13,500,000 | $ 12,400,000 | $ 9,500,000 |  |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months | 1,400,000 |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Three | 500,000 |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Four | 400,000 |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Five | 300,000 |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, after Year Five | $ 300,000 |  |  |  |  |  |  |
Furniture, fixtures and equipment |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Estimated useful lives (years) | 5 years |  |  |  |  |  |  |
Leases, Acquired-in-Place |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Amortization period of in-place leases and residential relationships (months) | 6 months |  |  |  |  |  |  |
Lease Intangibles, Gross | $ 6,100,000 | 8,300,000 | 54,000,000 |  |  |  |  |
Accumulated amortization | 2,300,000 | 1,800,000 | 21,900,000 |  |  |  |  |
Depreciation and amortization | $ 5,000,000 | 24,500,000 | 23,500,000 |  |  |  |  |
Minimum |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Percentage of ownership interests of all consolidated subsidiaries (percent) |  |  |  |  | 95.00% |  |  |
Minimum | Land improvements and buildings |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Estimated useful lives (years) | 8 years |  |  |  |  |  |  |
Minimum | Computer and software |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Estimated useful lives (years) | 3 years |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Percentage of ownership interests of all consolidated subsidiaries (percent) |  |  |  |  | 100.00% |  |  |
Maximum self insurance reserve for workers' compensation claims | $ 500,000 |  |  |  |  |  |  |
Maximum self insurance reserve for general liability claims | $ 100,000 |  |  |  |  |  |  |
Maximum | Land improvements and buildings |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Estimated useful lives (years) | 40 years |  |  |  |  |  |  |
Maximum | Computer and software |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Estimated useful lives (years) | 5 years |  |  |  |  |  |  |
Development Properties |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Number of Real Estate Properties | Communities |  |  |  |  |  |  | 5 |
Number of units under development community | Property |  |  |  |  |  | 748 |  |
Number of units in real estate property | Property |  |  |  |  |  | 37 |  |
Development Properties | Expected Costs |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Development and capital improvements in progress | $ 116,600,000 |  |  |  |  |  |  |
Development Properties | Costs Incurred to Date |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Development and capital improvements in progress | 42,300,000 |  |  |  |  |  |  |
Retail |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Number of Real Estate Properties | Property |  |  |  |  |  | 5 |  |
Square footage of real estate property (square foot) | ft² |  |  |  |  |  |  |  | 163
Commercial Properties |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Number of Real Estate Properties | Property |  |  |  |  |  | 1 |  |
Square footage of real estate property (square foot) | ft² |  |  |  |  |  |  |  | 208
Partially Owned Properties |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Number of Real Estate Properties | Property |  |  |  |  |  | 1 |  |
Square footage of real estate property (square foot) | ft² |  |  |  |  |  |  |  | 30
Colonial Grand at McKinney |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  | 25.00% |  |  |
Land Title Building |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  | 33.30% |  |  |
Parent Company [Member] |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Development and capital improvements in progress | 44,355,000 | 80,772,000 |  |  |  |  |  |
Total interest capitalized during period | 1,655,000 | 1,722,000 | 2,089,000 |  |  |  |  |
Capitalized Salaries | 400,000 | 1,700,000 | 400,000 |  |  |  |  |
Capitalized Real Estate Taxes | 200,000 | 200,000 | 300,000 |  |  |  |  |
Lease Intangibles, Gross | 8,138,332,000 | 7,990,132,000 |  |  |  |  |  |
Accumulated amortization | 1,482,368,000 | 1,358,400,000 |  |  |  |  |  |
Depreciation and amortization | 294,520,000 | 301,812,000 | 186,979,000 |  |  |  |  |
Goodwill | 1,607,000 | 2,321,000 | 4,100,000 |  |  |  |  |
Building Repairs and Maintenance Expenses [Member] |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Prior Period Reclassification Adjustment |  | 1,300,000 | 800,000 |  |  |  |  |
Utilities Expenses [Member] |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Prior Period Reclassification Adjustment |  | 33,800,000 | 17,600,000 |  |  |  |  |
Interest Expense |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Prior Period Reclassification Adjustment |  | 4,500,000 | $ 3,100,000 |  |  |  |  |
Unsecured Debt |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Unamortized Debt Issuance Expense | 11,700,000 | 9,300,000 |  |  |  |  |  |
Secured Debt [Member] |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Unamortized Debt Issuance Expense | 1,600,000 | 2,500,000 |  |  |  |  |  |
Assets Held-for-sale |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Prior Period Reclassification Adjustment | 34,100,000 | 36,500,000 |  |  |  |  |  |
Other Assets |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Unamortized Debt Issuance Expense | 13,300,000 | 11,800,000 |  |  |  |  |  |
Cash and Cash Equivalents [Member] |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Prior Period Reclassification Adjustment |  | 1,300,000 |  |  |  |  |  |
Accrued Liabilities [Member] |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |
Dividends Payable | 65,200,000 | 61,200,000 |  |  |  |  |  |
Accrued Real Estate Taxes | 63,300,000 | 56,800,000 |  |  |  |  |  |
Interest Payable | $ 17,200,000 | $ 17,800,000 |  |  |  |  |  |

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