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Real Estate and Accumulated Depreciation Activity of Real Estate and Accumulated Depreciation (BPLP) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward] |  |  |
Real Estate, Balance at the beginning of the year | $ 19,451,683 | $ 19,208,417 | $ 18,953,601
Real Estate, Additions to / improvements of real estate | 977,287 | 700,792 | 594,296
Real Estate, Assets sold / written off | (314,394) | (457,526) | (339,480)
Real Estate, Balance at the end of the year | 20,114,576 | 19,451,683 | 19,208,417
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward] |  |  |
Accumulated depreciation, Balance at beginning of the year | 3,905,940 | 3,529,978 | 3,145,701
Accumulated depreciation, Depreciation expense | 560,024 | 486,450 | 456,176
Accumulated depreciation, Assets sold / written off | (264,073) | (110,488) | (71,899)
Accumulated depreciation, Balance at end of the year | 4,201,891 | 3,905,940 | 3,529,978
Boston Properties Limited Partnership |  |  |
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward] |  |  |
Real Estate, Balance at the beginning of the year | 19,031,289 | 18,786,572 | 18,523,277
Real Estate, Additions to / improvements of real estate | 977,287 | 700,792 | 594,296
Real Estate, Assets sold / written off | (307,391) | (456,075) | (331,001)
Real Estate, Balance at the end of the year | 19,701,185 | 19,031,289 | 18,786,572
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward] |  |  |
Accumulated depreciation, Balance at beginning of the year | 3,826,862 | 3,458,640 | 3,081,040
Accumulated depreciation, Depreciation expense | 548,397 | 478,457 | 447,667
Accumulated depreciation, Assets sold / written off | (259,239) | (110,235) | (70,067)
Accumulated depreciation, Balance at end of the year | $ 4,116,020 | $ 3,826,862 | $ 3,458,640

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