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Segment Information (Schedule Of Reconciliation Of Net Operating Income To Net Income) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 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	$ 96,597	$ 79,460	$ 278,323	$ 250,694
Preferred Stock Dividends / Distributions	(2,589)	(2,618)	(5,207)	(5,207)
Noncontrolling interest-common units of the Operating Partnership	(11,357)	(9,394)	(32,771)	(29,530)
Noncontrolling interest—redeemable preferred units	0	(3)	0	(6)
Noncontrolling interest in property partnerships	(6,814)	(9,264)	(17,278)	(24,472)
Interest expense	(105,003)	(108,534)	(210,312)	(217,291)
Depreciation and amortization expense	(153,175)	(167,844)	(312,623)	(322,067)
Transaction costs	(913)	(208)	(938)	(535)
General and administrative expense	(25,418)	(22,284)	(54,771)	(51,075)
Gains (losses) from investments in securities	(478)	24	(737)	(369)
Interest and other income	(1,524)	(1,293)	(3,029)	(2,700)
Income from unconsolidated joint ventures	(2,234)	(3,078)	(4,025)	(17,912)
Development and management services income	(5,533)	(4,862)	(12,222)	(10,190)
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	96,597	79,460	278,323	250,694
Preferred Stock Dividends / Distributions	2,589	2,618	5,207	5,207
Noncontrolling interest-common units of the Operating Partnership	11,357	9,394	32,771	29,530
Noncontrolling interest—redeemable preferred units	0	3	0	6
Noncontrolling interest in property partnerships	6,814	9,264	17,278	24,472
Interest expense	105,003	108,534	210,312	217,291
Depreciation and amortization expense	153,175	167,844	312,623	322,067
Transaction costs	913	208	938	535
General and administrative expense	25,418	22,284	54,771	51,075
Gains on sales of real estate	0	0	67,623	95,084
Gains (losses) from investments in securities	478	(24)	737	369
Interest and other income	1,524	1,293	3,029	2,700
Income from unconsolidated joint ventures	2,234	3,078	4,025	17,912
Development and management services income	5,533	4,862	12,222	10,190
Net Operating Income	392,097	390,400	824,587	774,622
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	109,938	90,852	317,234	284,221
Preferred Stock Dividends / Distributions	(2,589)	(2,618)	(5,207)	(5,207)
Noncontrolling interest—redeemable preferred units	0	(3)	0	(6)
Noncontrolling interest in property partnerships	(6,814)	(9,264)	(17,278)	(24,472)
Interest expense	(105,003)	(108,534)	(210,312)	(217,291)
Depreciation and amortization expense	(151,191)	(165,846)	(308,652)	(318,070)
Transaction costs	(913)	(208)	(938)	(535)
General and administrative expense	(25,418)	(22,284)	(54,771)	(51,075)
Gains (losses) from investments in securities	(478)	24	(737)	(369)
Interest and other income	(1,524)	(1,293)	(3,029)	(2,700)
Income from unconsolidated joint ventures	(2,234)	(3,078)	(4,025)	(17,912)
Development and management services income	(5,533)	(4,862)	(12,222)	(10,190)
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	109,938	90,852	317,234	284,221
Preferred Stock Dividends / Distributions	2,589	2,618	5,207	5,207
Noncontrolling interest—redeemable preferred units	0	3	0	6
Noncontrolling interest in property partnerships	6,814	9,264	17,278	24,472
Interest expense	105,003	108,534	210,312	217,291
Depreciation and amortization expense	151,191	165,846	308,652	318,070
Transaction costs	913	208	938	535
General and administrative expense	25,418	22,284	54,771	51,075
Gains on sales of real estate	0	0	69,792	95,084
Gains (losses) from investments in securities	478	(24)	737	369
Interest and other income	1,524	1,293	3,029	2,700
Income from unconsolidated joint ventures	2,234	3,078	4,025	17,912
Development and management services income	5,533	4,862	12,222	10,190
Net Operating Income	$ 392,097	$ 390,400	$ 824,587	$ 774,622

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