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Organization and Basis of Presentation (Details) (USD $)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 1 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Oct. 31, 2014
Sep. 30, 2014
Building
Community
Partnership
Apartment
Project
Unit
Sep. 30, 2013
Sep. 30, 2014
Building
Community
Partnership
Apartment
Project
Unit
Sep. 30, 2013
Dec. 31, 2013
Apr. 30, 2014
Mar. 31, 2014
Vista Capri [Member]
Unit
Sep. 30, 2014
Coldwater Canyon [Member]
Unit
Sep. 30, 2014
Mt Sutro [Member]
Unit
Sep. 30, 2014
Stock Options [Member]
Sep. 30, 2013
Stock Options [Member]
Sep. 30, 2014
Stock Options [Member]
Sep. 30, 2013
Stock Options [Member]
Sep. 30, 2014
Restricted Stock [Member]
Sep. 30, 2013
Restricted Stock [Member]
Sep. 30, 2014
Restricted Stock [Member]
Sep. 30, 2013
Restricted Stock [Member]
Sep. 30, 2014
2014 LTIP Units [Member]
Sep. 30, 2014
Long Term Incentive Plans - Z-1 Units and 2014 LTIP Units [Member]
Sep. 30, 2013
Long Term Incentive Plans - Z-1 Units and 2014 LTIP Units [Member]
Sep. 30, 2014
Long Term Incentive Plans - Z-1 Units and 2014 LTIP Units [Member]
Sep. 30, 2013
Long Term Incentive Plans - Z-1 Units and 2014 LTIP Units [Member]
Sep. 30, 2014
Investment-Grade Unsecured Bonds [Member]
Dec. 31, 2013
Investment-Grade Unsecured Bonds [Member]
Sep. 30, 2014
Investment Funds - US Treasuries [Member]
Dec. 31, 2013
Investment Funds - US Treasuries [Member]
Sep. 30, 2014
Common Stock [Member]
Dec. 31, 2013
Common Stock [Member]
Sep. 30, 2014
Mortgage Backed Securities [Member]
Dec. 31, 2013
Mortgage Backed Securities [Member]
Sep. 30, 2014
Essex Portfolio, L.P. [Member]
Sep. 30, 2013
Essex Portfolio, L.P. [Member]
Sep. 30, 2014
Essex Portfolio, L.P. [Member]
Sep. 30, 2013
Essex Portfolio, L.P. [Member]
Dec. 31, 2013
Essex Portfolio, L.P. [Member]
Sep. 30, 2014
BRE Properties, Inc. [Member]
Property
Dec. 31, 2013
BRE Properties, Inc. [Member]
Sep. 30, 2013
BRE Properties, Inc. [Member]
Sep. 30, 2014
BRE Properties, Inc. [Member]
Property
Sep. 30, 2013
BRE Properties, Inc. [Member]
Sep. 30, 2014
BRE Properties, Inc. [Member]
Prepaid Expenses and Other Assets [Member]
Sep. 30, 2014
BRE Properties, Inc. [Member]
Essex Portfolio, L.P. [Member]
Sep. 30, 2013
BRE Properties, Inc. [Member]
Essex Portfolio, L.P. [Member]
Sep. 30, 2014
BRE Properties, Inc. [Member]
Essex Portfolio, L.P. [Member]
Sep. 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            
Number of properties contributed                                                                         14     14            
Value of properties contributed                                                                               $ 1,400,000,000            
Change in fair value and amortization of derivatives [Abstract]                                                                                            
Balance at beginning (52,298,000)     (59,724,000)                                                           (58,148,000)                        
Other comprehensive income (loss) before reclassification, derivative       1,428,000                                                           1,487,000                        
Amounts reclassified from accumulated other comprehensive loss       5,997,000                                                           6,245,000                        
Net other comprehensive income (loss)       7,425,000                                                           7,732,000                        
Balance at the end   (52,298,000)   (52,298,000)   (59,724,000)                                                   (50,416,000)   (50,416,000)                        
Unrealized gains/(losses) on available for sale securities [Abstract]                                                                                            
Balance at beginning 890,000     (748,000)                                                           (792,000)                        
Other comprehensive income (loss) before reclassification, available for sale securities, total       2,479,000                                                           2,591,000                        
Amounts reclassified from accumulated other comprehensive loss       (841,000)                                                           (886,000)                        
Net other comprehensive income (loss)       1,638,000                                                           1,705,000                        
Balance at the end   890,000   890,000   (748,000)                                                   913,000   913,000                        
Accumulated other comprehensive loss, net by component [Abstract]                                                                                            
Balance at beginning (51,408,000)     (60,472,000)                                                           (58,940,000)                        
Other comprehensive income (loss) before reclassification       3,907,000                                                           4,078,000                        
Amounts reclassified from accumulated other comprehensive loss       5,156,000                                                           5,359,000                        
Net other comprehensive income (loss)       9,063,000                                                           9,437,000                        
Balance at the end   (51,408,000)   (51,408,000)   (60,472,000)                                                   (49,503,000)   (49,503,000)                        
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 development                                                                         5,618,000,000     5,618,000,000            
Rental properties, excluding co-investments                                                                         108,000,000     108,000,000            
Assets held for sale                                                                         218,000,000     218,000,000            
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 180,000,000     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                                                                         270,479,000   238,668,000 776,761,000 699,701,000   270,479,000 238,668,000 776,761,000 699,701,000
Net income available to common shareholders                                                                         59,341,000 [1]   59,361,000 [1] 214,549,000 [1],[2] 66,806,000 [1],[2]   59,341,000 [1] 59,361,000 [1] 214,549,000 [1],[2] 66,690,000 [1],[2]
Earnings per share, diluted (in dollars per share)                                                                         $ 0.91 [1]   $ 0.95 [1] $ 3.34 [1] $ 1.07 [1]   $ 0.91 [1] $ 0.95 [1] $ 3.34 [1] $ 1.07 [1]
Merger related costs   3,857,000 0 46,413,000 0                                                     3,857,000 0 46,413,000 0   3,900,000 4,300,000   46,400,000            
Increase in the preliminary fair value of personal property                                                                         100,900,000     100,900,000            
Increase in the estimated useful life of real property                                                                         5 years                  
Estimated useful life of real property                                                                         30 years                  
Additional depreciation expense                                                                         4,200,000     8,500,000            
Revenues   270,479,000 153,948,000 690,605,000 451,829,000                                                     270,479,000 153,948,000 690,605,000 451,829,000   95,200,000     186,700,000            
Net loss   58,684,000 75,875,000 89,312,000 135,153,000                                                     58,684,000 75,875,000 89,312,000 135,153,000   6,000,000     14,200,000            
Dilutive effect of merger related costs (in shares)                                                                               23,100,000 23,100,000          
Real estate classified as held for sale   107,772,000   107,772,000   0                                                   107,772,000   107,772,000   0                    
Income from discontinued operations                                                                               105,000,000            
General partner ownership interest (in hundredths)       96.70%                                                                                    
Operating Partnership units outstanding (in shares)   2,155,783   2,155,783   2,149,802                                                                                
Redemption value of Operating Partnership units outstanding   385,300,000   385,300,000   308,500,000                                                                                
Number of apartment communities owned   239   239                                                                                    
Apartment units owned (in units)   56,622   56,622                                                                                    
Ownership interests, number of commercial buildings   5   5                                                                                    
Ownership interests, number of active development projects   14   14                                                                                    
Cyber-intrusion expenses       1,200,000                                                                                    
Schedule of Available-for-sale Securities [Line Items]                                                                                            
Cost/Amortized Cost                                               14,396,000 15,446,000 5,018,000 3,675,000 22,523,000 13,104,000                                  
Gross Unrealized Gain (Loss)                                               (51,000) 509,000 7,000 3,000 957,000 (1,304,000)                                  
Carrying Value   108,147,000   108,147,000   90,084,000                                   14,345,000 15,955,000 5,025,000 3,678,000 23,480,000 11,800,000     108,147,000   108,147,000   90,084,000                    
Cost/Amortized Cost                                                           65,297,000 58,651,000                              
Gross Unrealized Gain (Loss)                                                           0 0                              
Carrying Value                                                           65,297,000 58,651,000                              
Total Amortized Cost   107,234,000   107,234,000   90,876,000                                                                                
Total Gross Unrealized Gain (Loss)       913,000   (792,000)                                                                                
Total Carrying Value   108,147,000   108,147,000   90,084,000                                                                                
Proceeds from sales of available for sale securities     22,800,000 6,300,000                                                                                    
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)   991,983   991,983   1,007,879                                                                                
Redemption value of the variable interest entities   177,300,000   177,300,000   144,600,000                                                                                
Assets related to variable interest entities, net intercompany eliminations   234,700,000   234,700,000   224,400,000                                                                                
Liabilities related to variable interest entities, net of intercompany eliminations   194,900,000   194,900,000   178,300,000                                                                                
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]                                                                                            
Stock-based compensation expense       4,996,000 3,137,000           700,000 500,000     2,900,000 1,600,000 4,200,000 2,900,000   400,000 500,000 1,500,000 1,500,000                     4,996,000 3,137,000                      
Intrinsic value of options exercised                     1,000,000 100,000 4,200,000 2,900,000                                                                
Intrinsic value of the options outstanding and fully vested                     15,700,000   15,700,000             23,500,000   23,500,000                                                
Unrecognized compensation cost                     5,700,000   5,700,000   5,200,000   5,200,000     6,700,000   6,700,000                                                
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   4,300,000,000   4,300,000,000                                                                                    
Fixed rate debt fair value   4,500,000,000   4,500,000,000                                                                                    
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   65,300,000   65,300,000   93,700,000                                                                                
Mortgage backed securities fair value   58,700,000   58,700,000   86,200,000                                                                                
Capitalization Policy [Abstract]                                                                                            
Capitalized internal costs related to development and redevelopment projects   2,900,000 1,800,000 7,600,000 5,100,000                                                                                  
Capitalized salaries   2,400,000 800,000 6,700,000 2,000,000                                                                                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                                                                                            
Units in the community               106 39 99                                                                        
Sales price of communities sold               14,400,000 9,500,000 39,500,000                                                                        
Gain on sale of real estate               $ 7,900,000 $ 2,200,000 $ 29,200,000                                                                        
[1] (1) The supplemental pro forma net income available to common stockholders were adjusted to exclude $ 3.9 million and $ 46.4 million of merger related costs incurred by Essex during the three and nine months ended September 30, 2014. The 2014 supplemental pro forma net income available to common stockholders were adjusted to include these charges plus $ 4.3 million of merger related costs incurred by Essex during the three months ended December 31, 2013. The supplemental 2014 and 2013 proforma earnings per share, diluted, were adjusted by approximately 23.1 million shares due to the common stock issued in connection with the merger.
[2] The 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 during the quarter ended March 31, 2014 that are non-recurring transactions.