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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward] |  |  |
Real Estate, Balance at the beginning of the year | $ 21,058,714 | $ 20,114,576 | $ 19,451,683
Real Estate, Additions to / improvements of real estate | 1,043,379 | 1,099,286 | 977,287
Real Estate, Assets sold / written off | (496,548) | (155,148) | (314,394)
Real Estate, Balance at the end of the year | 21,605,545 | 21,058,714 | 20,114,576
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward] |  |  |
Accumulated depreciation, Balance at beginning of the year | 4,566,570 | 4,201,891 | 3,905,940
Accumulated depreciation, Depreciation expense | 533,342 | 497,059 | 560,024
Accumulated depreciation, Assets sold / written off | (228,810) | (132,380) | (264,073)
Accumulated depreciation, Balance at end of the year | 4,871,102 | 4,566,570 | 4,201,891
Boston Properties Limited Partnership |  |  |
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward] |  |  |
Real Estate, Balance at the beginning of the year | 20,647,236 | 19,701,185 | 19,031,289
Real Estate, Additions to / improvements of real estate | 1,043,379 | 1,099,286 | 977,287
Real Estate, Assets sold / written off | (483,426) | (153,235) | (307,391)
Real Estate, Balance at the end of the year | 21,207,189 | 20,647,236 | 19,701,185
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward] |  |  |
Accumulated depreciation, Balance at beginning of the year | 4,473,895 | 4,116,020 | 3,826,862
Accumulated depreciation, Depreciation expense | 525,584 | 488,919 | 548,397
Accumulated depreciation, Assets sold / written off | (225,679) | (131,044) | (259,239)
Accumulated depreciation, Balance at end of the year | $ 4,773,800 | $ 4,473,895 | $ 4,116,020

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