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Reportable Segments - NOI for Each Segment from Our Rental Real Estate Specific to Continuing Operations (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting Information [Line Items]      
Rental income $ 2,470,689 $ 2,422,233 $ 2,736,578
Operating income 847,471 856,086 1,009,238
Total Assets 20,570,599 20,704,148  
Capital Expenditures 202,607 172,177  
Same store      
Segment Reporting Information [Line Items]      
Rental income 2,248,564 2,200,094 2,099,166
Operating expenses 656,321 639,342 613,924
Operating income 1,592,243 1,560,752 1,485,242
Total Assets 16,578,123 17,052,235  
Capital Expenditures 197,140 154,037  
Non-same store/other      
Segment Reporting Information [Line Items]      
Rental income 222,125 222,139 637,412
Operating expenses 84,455 84,868 205,038
Operating income 137,670 137,271 432,374
Total Assets 3,992,476 3,651,913  
Capital Expenditures 5,467 18,140  
Same Store, Non-same Store and Other      
Segment Reporting Information [Line Items]      
Rental income 2,470,689 2,422,233 2,736,578
Operating expenses 740,776 724,210 818,962
Operating income 1,729,913 1,698,023 1,917,616
Other markets | Same store      
Segment Reporting Information [Line Items]      
Rental income 1,839 1,797 1,680
Operating expenses 652 567 528
Operating income 1,187 1,230 1,152
Total Assets 12,768 12,902  
Capital Expenditures 103 67  
Los Angeles | Same store      
Segment Reporting Information [Line Items]      
Rental income 396,375 382,425 349,285
Operating expenses 111,854 111,055 104,614
Operating income 284,521 271,370 244,671
Total Assets 2,601,569 2,678,787  
Capital Expenditures 26,679 26,335  
Orange County | Same store      
Segment Reporting Information [Line Items]      
Rental income 88,527 84,590 75,068
Operating expenses 21,544 20,600 18,550
Operating income 66,983 63,990 56,518
Total Assets 328,593 336,195  
Capital Expenditures 9,237 6,876  
San Diego | Same store      
Segment Reporting Information [Line Items]      
Rental income 88,507 84,646 83,491
Operating expenses 23,073 22,366 22,938
Operating income 65,434 62,280 60,553
Total Assets 421,267 436,005  
Capital Expenditures 4,922 4,851  
Subtotal - Southern California | Same store      
Segment Reporting Information [Line Items]      
Rental income 573,409 551,661 507,844
Operating expenses 156,471 154,021 146,102
Operating income 416,938 397,640 361,742
Total Assets 3,351,429 3,450,987  
Capital Expenditures 40,838 38,062  
Washington DC | Same store      
Segment Reporting Information [Line Items]      
Rental income 430,056 424,350 417,985
Operating expenses 129,717 126,154 123,450
Operating income 300,339 298,196 294,535
Total Assets 3,803,185 3,916,264  
Capital Expenditures 35,423 33,867  
New York | Same store      
Segment Reporting Information [Line Items]      
Rental income 457,100 456,664 450,460
Operating expenses 165,173 159,302 152,682
Operating income 291,927 297,362 297,778
Total Assets 4,123,841 4,256,087  
Capital Expenditures 32,209 25,171  
San Francisco | Same store      
Segment Reporting Information [Line Items]      
Rental income 378,939 371,633 343,089
Operating expenses 91,777 90,393 84,603
Operating income 287,162 281,240 258,486
Total Assets 2,467,872 2,521,729  
Capital Expenditures 38,392 24,455  
Boston | Same store      
Segment Reporting Information [Line Items]      
Rental income 228,724 225,014 232,462
Operating expenses 63,148 62,650 67,252
Operating income 165,576 162,364 165,210
Total Assets 1,653,997 1,702,675  
Capital Expenditures 28,696 18,396  
Seattle | Same store      
Segment Reporting Information [Line Items]      
Rental income 178,497 168,975 145,646
Operating expenses 49,383 46,255 39,307
Operating income 129,114 122,720 106,339
Total Assets 1,165,031 1,191,591  
Capital Expenditures 21,479 14,019  
Non-same store | Non-same store/other      
Segment Reporting Information [Line Items]      
Rental income 207,974 117,143 72,123
Operating expenses 72,723 41,877 27,078
Operating income 135,251 75,266 45,045
Total Assets 3,221,468 2,727,875  
Capital Expenditures 4,849 10,965  
Other | Non-same store/other      
Segment Reporting Information [Line Items]      
Rental income 14,151 104,996 565,289
Operating expenses 11,732 42,991 177,960
Operating income 2,419 62,005 $ 387,329
Total Assets 771,008 924,038  
Capital Expenditures $ 618 $ 7,175