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Real Estate Narrative (Details) |  |  | 2 Months Ended | 3 Months Ended | 5 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 13, 2017 USD ($) ft² | Apr. 19, 2017 USD ($) a | Jun. 30, 2017 USD ($) | Jun. 13, 2017 USD ($) ft² | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Jun. 13, 2017 USD ($) ft² | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Jun. 29, 2017 USD ($) yr apartments | May 27, 2017 ft² | May 15, 2017 USD ($) ft² | Apr. 06, 2017 ft²
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  | $ 656,907,000 | $ 623,546,000 |  | $ 1,289,135,000 | $ 1,289,531,000 |  |  |  |
Earnings |  |  |  |  | 238,690,000 | 218,124,000 |  | 444,915,000 | 468,477,000 |  |  |  |
Proceeds from sales of real estate |  |  |  |  |  |  |  | 17,049,000 | 104,816,000 |  |  |  |
Gains on sales of real estate |  |  |  |  | 3,767,000 | 0 |  | 3,900,000 | 67,623,000 |  |  |  |
145 Broadway [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net Rentable Area (in sf) | ft² |  |  |  |  |  |  |  |  |  |  |  |  | 485,000
Reservoir Place North [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net Rentable Area (in sf) | ft² |  |  |  |  |  |  |  |  |  |  | 73,000 |  |
MacArthur Transit Center [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Term of Lease Signed (in years) | yr |  |  |  |  |  |  |  |  |  | 99 |  |  |
Number of apartment units | apartments |  |  |  |  |  |  |  |  |  | 402 |  |  |
Capital Lease Obligations |  |  |  |  |  |  |  |  |  | $ 28,962,000 |  |  |
103 Carnegie Center [Member] | 103 Carnegie Center [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  | $ 400,000 |  |  |  |  |  |  |  |  |  |
Earnings |  |  | $ 200,000 |  |  |  |  |  |  |  |  |  |
Net Rentable Area (in sf) | ft² |  |  |  |  |  |  |  |  |  |  |  | 96,000 |
Aggregate purchase price |  |  |  |  |  |  |  |  |  |  |  | $ 15,800,000 |
Boston Properties Limited Partnership |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  | 656,907,000 | 623,546,000 |  | 1,289,135,000 | 1,289,531,000 |  |  |  |
Earnings |  |  |  |  | 240,775,000 | 220,108,000 |  | 449,147,000 | 472,448,000 |  |  |  |
Proceeds from sales of real estate |  |  |  |  |  |  |  | 17,049,000 | 104,816,000 |  |  |  |
Gains on sales of real estate |  |  |  |  | $ 4,344,000 | 0 |  | $ 4,477,000 | 69,792,000 |  |  |  |
30 Shattuck Road [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Area of Land | a |  | 9.5 |  |  |  |  |  |  |  |  |  |  |
Contractual Sales Price |  | $ 5,000,000 |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales of real estate |  | 5,000,000 |  |  |  |  |  |  |  |  |  |  |
Gains on sales of real estate |  | $ 3,700,000 |  |  |  |  |  |  |  |  |  |  |
40 Shattuck Road [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net Rentable Area (in sf) | ft² | 122,000 |  |  | 122,000 |  |  | 122,000 |  |  |  |  |  |
Contractual Sales Price | $ 12,000,000 |  |  | $ 12,000,000 |  |  | $ 12,000,000 |  |  |  |  |  |
Net income (loss) |  |  |  | $ 19,000 |  | $ (93,000) | $ (28,000) |  | $ 15,000 |  |  |  |
Proceeds from sales of real estate | 11,900,000 |  |  |  |  |  |  |  |  |  |  |  |
Gains on sales of real estate | 28,000 |  |  |  |  |  |  |  |  |  |  |  |
40 Shattuck Road [Member] | Boston Properties Limited Partnership |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gains on sales of real estate | $ 600,000 |  |  |  |  |  |  |  |  |  |  |  |

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