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Segment Information (Schedule Of Reconciliation Of Net Operating Income To Net Income) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Net income attributable to the Company's common shareholders / unitholders $ 76,753 $ 184,082 $ 355,114 $ 434,702
Preferred Stock Dividends / Distributions (2,589) (2,647) (7,796) (7,854)
Noncontrolling interest-common units of the Operating Partnership (9,387) (21,302) (42,120) (50,906)
Noncontrolling interest—redeemable preferred units 0 0 0 (6)
Noncontrolling interest in property partnerships 17,225 (115,240) (53) (139,712)
Losses from interest rate contracts (140) 0 (140) 0
Losses from early extinguishments of debt (371) 0 (371) 0
Interest expense (104,641) (108,727) (314,953) (326,018)
Depreciation and amortization expense (203,748) (153,015) (516,371) (475,082)
Impairment loss (1,783) 0 (1,783) 0
Transaction costs (249) (254) (1,187) (789)
General and administrative expense (25,165) (20,944) (79,936) (72,019)
Gains (losses) from investments in securities (976) 1,515 (1,713) 1,146
Interest and other income (3,628) (3,637) (6,657) (6,337)
Income from unconsolidated joint ventures (1,464) (2,647) (5,489) (20,559)
Development and management services income (6,364) (5,912) (18,586) (16,102)
Business Intersegment, Eliminations [Member]        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Net income attributable to the Company's common shareholders / unitholders 76,753 184,082 355,114 434,702
Preferred Stock Dividends / Distributions 2,589 2,647 7,796 7,854
Noncontrolling interest-common units of the Operating Partnership 9,387 21,302 42,120 50,906
Noncontrolling interest—redeemable preferred units 0 0 0 6
Noncontrolling interest in property partnerships (17,225) 115,240 53 139,712
Losses from interest rate contracts 140 0 140 0
Losses from early extinguishments of debt 371 0 371 0
Interest expense 104,641 108,727 314,953 326,018
Depreciation and amortization expense 203,748 153,015 516,371 475,082
Impairment loss 1,783 0 1,783 0
Transaction costs 249 254 1,187 789
General and administrative expense 25,165 20,944 79,936 72,019
Gains on sales of real estate 12,983 199,479 80,606 294,563
Gains (losses) from investments in securities 976 (1,515) 1,713 (1,146)
Interest and other income 3,628 3,637 6,657 6,337
Income from unconsolidated joint ventures 1,464 2,647 5,489 20,559
Development and management services income 6,364 5,912 18,586 16,102
Net Operating Income 382,186 396,051 1,206,773 1,170,673
Boston Properties Limited Partnership        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Net income attributable to the Company's common shareholders / unitholders 91,306 207,626 408,540 491,847
Preferred Stock Dividends / Distributions (2,589) (2,647) (7,796) (7,854)
Noncontrolling interest—redeemable preferred units 0 0 0 (6)
Noncontrolling interest in property partnerships 17,225 (115,240) (53) (139,712)
Losses from interest rate contracts (140) 0 (140) 0
Losses from early extinguishments of debt (371) 0 (371) 0
Interest expense (104,641) (108,727) (314,953) (326,018)
Depreciation and amortization expense (198,582) (151,017) (507,234) (469,087)
Impairment loss (1,783) 0 (1,783) 0
Transaction costs (249) (254) (1,187) (789)
General and administrative expense (25,165) (20,944) (79,936) (72,019)
Gains (losses) from investments in securities (976) 1,515 (1,713) 1,146
Interest and other income (3,628) (3,637) (6,657) (6,337)
Income from unconsolidated joint ventures (1,464) (2,647) (5,489) (20,559)
Development and management services income (6,364) (5,912) (18,586) (16,102)
Boston Properties Limited Partnership | Business Intersegment, Eliminations [Member]        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Net income attributable to the Company's common shareholders / unitholders 91,306 207,626 408,540 491,847
Preferred Stock Dividends / Distributions 2,589 2,647 7,796 7,854
Noncontrolling interest—redeemable preferred units 0 0 0 6
Noncontrolling interest in property partnerships (17,225) 115,240 53 139,712
Losses from interest rate contracts 140 0 140 0
Losses from early extinguishments of debt 371 0 371 0
Interest expense 104,641 108,727 314,953 326,018
Depreciation and amortization expense 198,582 151,017 507,234 469,087
Impairment loss 1,783 0 1,783 0
Transaction costs 249 254 1,187 789
General and administrative expense 25,165 20,944 79,936 72,019
Gains on sales of real estate 12,983 199,723 82,775 294,807
Gains (losses) from investments in securities 976 (1,515) 1,713 (1,146)
Interest and other income 3,628 3,637 6,657 6,337
Income from unconsolidated joint ventures 1,464 2,647 5,489 20,559
Development and management services income 6,364 5,912 18,586 16,102
Net Operating Income $ 382,186 $ 396,051 $ 1,206,773 $ 1,170,673