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Organization and Basis of Presentation (Details) (USD $)
 3 Months Ended 6 Months Ended 12 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2014
Unit
Apartment
Building
Partnership
Project
Community
Jun. 30, 2013
Jun. 30, 2014
Unit
Apartment
Building
Partnership
Project
Community
Jun. 30, 2013
Dec. 31, 2013
Apr. 30, 2014
Jun. 30, 2014
Vista Capri [Member]
Unit
Jun. 30, 2014
Stock Options [Member]
Jun. 30, 2013
Stock Options [Member]
Jun. 30, 2014
Stock Options [Member]
Jun. 30, 2013
Stock Options [Member]
Jun. 30, 2014
Restricted Stock [Member]
Jun. 30, 2013
Restricted Stock [Member]
Jun. 30, 2014
Restricted Stock [Member]
Jun. 30, 2013
Restricted Stock [Member]
Jun. 30, 2014
2014 LTIP Units [Member]
Jun. 30, 2014
Long Term Incentive Plans - Z-1 Units and 2014 LTIP Units [Member]
Jun. 30, 2013
Long Term Incentive Plans - Z-1 Units and 2014 LTIP Units [Member]
Jun. 30, 2014
Long Term Incentive Plans - Z-1 Units and 2014 LTIP Units [Member]
Jun. 30, 2013
Long Term Incentive Plans - Z-1 Units and 2014 LTIP Units [Member]
Jun. 30, 2014
Investment-Grade Unsecured Bonds [Member]
Dec. 31, 2013
Investment-Grade Unsecured Bonds [Member]
Jun. 30, 2014
Investment Funds - US Treasuries [Member]
Dec. 31, 2013
Investment Funds - US Treasuries [Member]
Jun. 30, 2014
Common Stock [Member]
Dec. 31, 2013
Common Stock [Member]
Jun. 30, 2014
Mortgage Backed Securities [Member]
Dec. 31, 2013
Mortgage Backed Securities [Member]
Jun. 30, 2014
Essex Portfolio, L.P. [Member]
Jun. 30, 2013
Essex Portfolio, L.P. [Member]
Jun. 30, 2014
Essex Portfolio, L.P. [Member]
Jun. 30, 2013
Essex Portfolio, L.P. [Member]
Dec. 31, 2013
Essex Portfolio, L.P. [Member]
Jun. 30, 2014
BRE Properties, Inc. [Member]
Dec. 31, 2013
BRE Properties, Inc. [Member]
Jun. 30, 2013
BRE Properties, Inc. [Member]
Jun. 30, 2014
BRE Properties, Inc. [Member]
Jun. 30, 2013
BRE Properties, Inc. [Member]
Jun. 30, 2014
BRE Properties, Inc. [Member]
Prepaid Expenses and Other Assets [Member]
Jun. 30, 2014
BRE Properties, Inc. [Member]
Essex Portfolio, L.P. [Member]
Jun. 30, 2013
BRE Properties, Inc. [Member]
Essex Portfolio, L.P. [Member]
Jun. 30, 2014
BRE Properties, Inc. [Member]
Essex Portfolio, L.P. [Member]
Jun. 30, 2013
BRE Properties, Inc. [Member]
Essex Portfolio, L.P. [Member]
Schedule of Mergers [Line Items]                                                                                      
Common shares conversion ratio in connection with merger (in shares)                                                                   0.2971                  
Cash consideration per share (in dollars per share)                                                                   $ 7.18     $ 7.18            
Special dividend (in dollars per share)                                                                   $ 5.15                  
Cash consideration before special dividend (in dollars per share)                                                                   $ 12.33     $ 12.33            
Number of shares of common stock issued in merger (in shares)                                                                   23,100,000                  
Share price (in dollars per share) $ 174   $ 174                                                             $ 61     $ 61            
Share price after deducting special dividend and cash consideration (in dollars per share) $ 164   $ 164                                                             $ 48.67     $ 48.67            
Change in fair value and amortization of derivatives [Abstract]                                                                                      
Balance at beginning     $ (59,724,000)                                                       $ (58,148,000)                        
Other comprehensive income (loss) before reclassification, derivative     123,000                                                       130,000                        
Amounts reclassified from accumulated other comprehensive loss     3,982,000                                                       4,163,000                        
Net other comprehensive income (loss)     4,105,000                                                       4,293,000                        
Balance at the end (55,619,000)   (55,619,000)   (59,724,000)                                               (53,855,000)   (53,855,000)                        
Unrealized gains/(losses) on available for sale securities [Abstract]                                                                                      
Balance at beginning 1,825,000   1,825,000   (748,000)                                               1,898,000   1,898,000   (792,000)                    
Other comprehensive income (loss) before reclassification, available for sale securities, total     3,414,000                                                       3,576,000                        
Amounts reclassified from accumulated other comprehensive loss     (841,000)                                                       (886,000)                        
Net other comprehensive income (loss)     2,573,000                                                       2,690,000                        
Balance at the end 1,825,000   1,825,000   (748,000)                                               1,898,000   1,898,000   (792,000)                    
Accumulated other comprehensive loss, net by component [Abstract]                                                                                      
Balance at beginning (53,794,000)   (53,794,000)   (60,472,000)                                               (51,957,000)   (51,957,000)   (58,940,000)                    
Other comprehensive income (loss) before reclassification     3,537,000                                                       3,706,000                        
Amounts reclassified from accumulated other comprehensive loss     3,141,000                                                       3,277,000                        
Net other comprehensive income (loss)     6,678,000                                                       6,983,000                        
Balance at the end (53,794,000)   (53,794,000)   (60,472,000)                                               (51,957,000)   (51,957,000)   (58,940,000)                    
Business Acquisition, Purchase Price Allocation [Abstract]                                                                                      
Acquired in-place lease value                                                                             19,000,000        
Cash assumed                                                                   140,000,000     140,000,000            
Rental properties and real estate under developement                                                                   5,613,000,000     5,613,000,000            
Rental properties, excluding co-investments                                                                   108,000,000     108,000,000            
Assets held for sale                                                                   223,000,000     223,000,000            
Co-investments                                                                   80,000,000     80,000,000            
In-place lease value                                                                   16,000,000     16,000,000            
Acquired in-place lease value 80,358,000 0 80,358,000 0                                                 80,358,000 0 80,358,000 0   (1,747,000,000)     (1,747,000,000)            
Secured and unsecured debt           (711,300,000)                                                       (94,000,000)     (94,000,000)            
Other liabilities                                                                   (5,000,000)     (5,000,000)            
Total consideration                                                                   4,334,000,000     4,334,000,000            
Cash consideration for BRE merger     555,826,000 0                                                     555,826,000 0         556,000,000            
Equity consideration for BRE merger                                                                   3,778,000,000     3,778,000,000            
Pro Forma results in connection with BRE merger                                                                                      
Total revenue                                                                   259,450,000   233,252,000 506,282,000 461,033,000   259,450,000 233,252,000 506,282,000 461,033,000
Net income available to common shareholders                                                                   30,705,000 [1],[2]   35,789,000 [1],[2] 158,676,000 [1],[2] 19,017,000 [1],[2]   31,695,000 [1],[2] 36,891,000 [1],[2] 163,618,000 [1],[2] 19,596,000 [1],[2]
Earnings per share, diluted (in dollars per share)                                                                   $ 0.49 [1]   $ 0.59 [1] $ 2.56 [1] $ 0.31 [1]   $ 0.49 [1] $ 0.59 [1] $ 2.56 [1] $ 0.31 [1]
Merger related costs 26,497,000 0 42,556,000 0                                                 26,497,000 0 42,556,000 0   26,500,000 4,300,000   42,600,000            
Revenues 259,450,000 150,815,000 420,126,000 297,880,000                                                 259,450,000 150,815,000 420,126,000 297,880,000   91,500,000     91,500,000            
Net loss 8,428,000 29,575,000 34,834,000 59,278,000                                                 8,428,000 29,575,000 34,834,000 59,278,000   4,000,000     4,000,000            
Dilutive effect of merger related costs (in shares)                                                                         23,100,000 23,100,000          
Income from discontinued operations                                                                         105,000,000            
General partner ownership interest (in hundredths)     96.60%                                                                                
Operating Partnership units outstanding (in shares) 2,171,422   2,171,422   2,149,802                                                                            
Redemption value of Operating Partnership units outstanding 401,500,000   401,500,000   308,500,000                                                                            
Number of apartment communities owned 239   239                                                                                
Apartment units owned (in units) 55,855   55,855                                                                                
Ownership interests, number of commercial buildings 5   5                                                                                
Ownership interests, number of active development projects 11   11                                                                                
Schedule of Available-for-sale Securities [Line Items]                                                                                      
Cost/Amortized Cost                                         11,627,000 15,446,000 3,842,000 3,675,000 25,492,000 13,104,000                                  
Gross Unrealized Gain (Loss)                                         217,000 509,000 6,000 3,000 2,467,000 (1,304,000)                                  
Carrying Value 106,358,000   106,358,000   90,084,000                               11,844,000 15,955,000 3,848,000 3,678,000 27,959,000 11,800,000     106,358,000   106,358,000   90,084,000                    
Cost/Amortized Cost                                                     62,707,000 58,651,000                              
Gross Unrealized Gain (Loss)                                                     0 0                              
Carrying Value                                                     62,707,000 58,651,000                              
Total Amortized Cost 103,668,000   103,668,000   90,876,000                                                                            
Total Gross Unrealized Gain (Loss)     2,690,000   (792,000)                                                                            
Total Carrying Value 106,358,000   106,358,000   90,084,000                                                                            
Proceeds from sales of available for sale securities   20,300,000 4,500,000                                                                                
Gain from sales of available-for-sale securities   1,800,000 900,000                                                                                
Variable Interest Entities [Abstract]                                                                                      
Number of DownREIT limited partnerships the company consolidates 19   19                                                                                
Number of communities within the DownREIT partnership 12   12                                                                                
Total DownREIT Partnership's Outstanding units (shares) 994,258   994,258   1,007,879                                                                            
Redemption value of the variable interest entities 183,800,000   183,800,000   144,600,000                                                                            
Assets related to variable interest entities, net intercompany eliminations 232,600,000   232,600,000   194,900,000                                                                            
Liabilities related to variable interest entities, net of intercompany eliminations 221,200,000   221,200,000   178,300,000                                                                            
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]                                                                                      
Stock-based compensation expense     3,625,000 2,126,000       1,600,000 500,000 2,200,000 1,100,000 1,600,000 500,000 2,200,000 1,100,000   200,000 500,000 800,000 1,000,000                     3,625,000 2,126,000                      
Intrinsic value of options exercised               2,500,000 1,900,000 3,200,000 2,800,000                                                                
Intrinsic value of the options outstanding and fully vested               17,400,000   17,400,000             24,300,000   24,300,000                                                
Unrecognized compensation cost               5,500,000   5,500,000   5,500,000   5,500,000     7,100,000   7,100,000                                                
Granted (in shares)                               50,500                                                      
Unrecognized compensation cost, weighted average recognition period, minimum               1 year       1 year                                                              
Unrecognized compensation cost, weighted average recognition period, maximum               5 years       7 years                                                              
Percentage subject to performance based vesting (in hundredths)                               90.00%                                                      
Percentage subject to service-based vesting (in hundredths)                               10.00%                                                      
Percentage of performance based vesting of 2014 Ltip Units eligible to be earned on absolute total stockholders return (in hundredths)                               0.33%                                                      
Percentage of performance based vesting of 2014 Ltip Units eligible to be earned on relative total stockholders return (in hundredths)                               0.66%                                                      
Performance period                               1 year                                                      
Unamortized cost recognition period                                 6 years                                                    
Fair Value of Financial Instruments [Abstract]                                                                                      
Fixed rate debt carrying amount 4,460,000,000   4,460,000,000                                                                                
Fixed rate debt fair value 4,630,000,000   4,630,000,000                                                                                
Variable rate debt, carrying amount 539,200,000   539,200,000                                                                                
Variable rate debt fair value 520,400,000   520,400,000                                                                                
Mortgage backed securities carrying value 62,700,000   62,700,000   92,000,000                                                                            
Mortgage backed securities fair value 89,400,000   89,400,000   86,200,000                                                                            
Capitalization Policy [Abstract]                                                                                      
Capitalized internal costs related to development and redevelopment projects 3,000,000 1,700,000 4,700,000 3,300,000                                                                              
Capitalized salaries 2,000,000 600,000 4,200,000 1,200,000                                                                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                                                                                      
Units in the community             106                                                                        
Sales price of communities sold             14,400,000                                                                        
Gain on sale of real estate             $ 7,900,000                                                                        
[1] 2014 supplemental pro forma net income available to common stockholders were adjusted to exclude $26,497 and $42,556 of merger related costs incurred by Essex during the three and six months ended June 30, 2014. 2013 supplemental pro forma net income available to common stockholders were adjusted to include these charges. 2014 and 2013 supplemental proforma earnings per share, diluted, were adjusted accordingly.
[2] 2014 supplemental pro forma net income available to common stockholders includes approximately $105 million from discontinued operations related to the sale of three BRE properties that are non-recurring transactions.