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Real Estate Activity During the Six Months Ended June 30, 2016 (Narrative) (Details) |  |  | 1 Months Ended | 2 Months Ended | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 03, 2016 USD ($) ft² | Feb. 01, 2016 USD ($) ft² | Jan. 31, 2016 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2015 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2015 USD ($) | Jun. 24, 2016 ft² | May 27, 2016 ft² | Apr. 22, 2016 USD ($) ft²
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  | $ 218,124,000 | $ 204,926,000 | $ 468,477,000 | $ 411,135,000 |  |  |
Proceeds from sales of real estate |  |  |  |  |  |  | 104,816,000 | 194,821,000 |  |  |
Gains on sales of real estate |  |  |  |  | 0 | 0 | 67,623,000 | 95,084,000 |  |  |
Revenues |  |  |  |  | 623,546,000 | 618,221,000 | 1,289,531,000 | 1,236,697,000 |  |  |
415 Main Street [Member] |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  | $ 1,200,000 |  |  | 3,700,000 |  | 6,300,000 |  |  |
Sale Price Of Sold Property |  | $ 105,400,000 |  |  |  |  |  |  |  |  |
Proceeds from sales of real estate |  | $ 104,900,000 |  |  |  |  |  |  |  |  |
Net Rentable Area (in sf) | ft² |  | 231,000 |  |  |  |  |  |  |  |  |
601 Massachusetts Avenue [Member] |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Rentable Area (in sf) | ft² |  |  |  |  |  |  |  |  |  | 479,000 |
804 Carnegie Center [Member] |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Rentable Area (in sf) | ft² |  |  |  |  |  |  |  |  |  | 130,000 |
10 CityPoint [Member] |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Rentable Area (in sf) | ft² |  |  |  |  |  |  |  |  | 241,000 |  |
Terminated lease at 250 West 55thStreet in NYC [Member] |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Rentable Area (in sf) | ft² | 85,000 |  |  |  |  |  |  |  |  |  |
Revenues | $ 45,000,000 |  |  |  |  |  |  |  |  |  |
Boston Properties Inc | 415 Main Street [Member] |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gains on sales of real estate |  | $ 60,800,000 |  |  |  |  |  |  |  |  |
Boston Properties Limited Partnership |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  | 220,108,000 | 206,924,000 | 472,448,000 | 415,132,000 |  |  |
Proceeds from sales of real estate |  |  |  |  |  |  | 104,816,000 | 194,821,000 |  |  |
Gains on sales of real estate |  |  |  |  | 0 | 0 | 69,792,000 | 95,084,000 |  |  |
Revenues |  |  |  |  | $ 623,546,000 | $ 618,221,000 | $ 1,289,531,000 | $ 1,236,697,000 |  |  |
Boston Properties Limited Partnership | 415 Main Street [Member] |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gains on sales of real estate |  | $ 63,000,000 |  |  |  |  |  |  |  |  |
Peterson Way [Member] |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  |  |  |  |  | $ 78,000,000
Net income (loss) |  |  |  | $ (94,000) |  |  |  |  |  |  |
Net Rentable Area (in sf) | ft² |  |  |  |  |  |  |  |  |  |  | 218,000
Portion of Building Leased (percentage) |  |  |  |  |  |  |  |  |  |  | 100.00%
Revenues |  |  |  | $ 1,100,000 |  |  |  |  |  |  |
Future development [Member] | Peterson Way [Member] |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Rentable Area (in sf) | ft² |  |  |  |  |  |  |  |  |  |  | 632,000

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