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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