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Selected Interim Financial Information (unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Total revenue	$ 757,501	$ 743,553	$ 733,741	$ 725,767	$ 705,157	$ 686,284	$ 664,484	$ 661,151	$ 2,960,562	$ 2,717,076	$ 2,602,076
Net income	176,009	141,370	203,461	131,159	185,241	150,445	160,565	216,312
Net income attributable to the Company	$ 140,824	$ 107,771	$ 164,318	$ 98,105	$ 148,529	$ 119,118	$ 128,681	$ 176,021	$ 521,534	$ 582,847	$ 462,439
Income attributable to the Company (in dollars per share / unit) - Basic	$ 0.91	$ 0.70	$ 1.06	$ 0.63	$ 0.96	$ 0.77	$ 0.83	$ 1.14	$ 3.31	$ 3.71	$ 2.93
Income attributable to the Company (in dollars per share / unit) - Diluted	$ 0.91	$ 0.70	$ 1.06	$ 0.63	$ 0.96	$ 0.77	$ 0.83	$ 1.14	$ 3.30	$ 3.70	$ 2.93
Boston Properties Limited Partnership
Total revenue	$ 757,501	$ 743,553	$ 733,741	$ 725,767	$ 705,157	$ 686,284	$ 664,484	$ 661,151	$ 2,960,562	$ 2,717,076	$ 2,602,076
Net income	177,851	143,212	205,822	134,837	192,884	153,676	162,986	220,766
Net income attributable to the Company	$ 158,888	$ 122,117	$ 185,715	$ 113,382	$ 173,834	$ 136,201	$ 145,961	$ 200,907	$ 590,602	$ 667,403	$ 523,366
Income attributable to the Company (in dollars per share / unit) - Basic	$ 0.92	$ 0.71	$ 1.08	$ 0.66	$ 1.01	$ 0.79	$ 0.85	$ 1.17	$ 3.37	$ 3.82	$ 2.99
Income attributable to the Company (in dollars per share / unit) - Diluted	$ 0.92	$ 0.71	$ 1.08	$ 0.66	$ 1.01	$ 0.79	$ 0.85	$ 1.17	$ 3.36	$ 3.81	$ 2.98

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