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Real Estate Activity During the Three Months Ended March 31, 2016 (Narrative) (Details) $ in Thousands |  |  | 1 Months Ended | 3 Months Ended
--- | --- | --- | --- | ---
Feb. 03, 2016 USD ($) ft² | Feb. 01, 2016 USD ($) ft² | Jan. 31, 2016 USD ($) | Mar. 31, 2016 USD ($) | Mar. 31, 2015 USD ($)
Real Estate Properties [Line Items] |  |  |  |  |
Net income |  |  |  | $ 250,353 | $ 206,209
Proceeds from sales of real estate |  |  |  | 104,816 | 194,821
Gains on sales of real estate |  |  |  | 67,623 | 95,084
Revenues |  |  |  | 665,985 | 618,476
415 Main Street [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Net income |  |  | $ 1,200 |  | 2,600
Sale Price Of Sold Property |  | $ 105,400 |  |  |
Proceeds from sales of real estate |  | $ 104,900 |  |  |
Net Rentable Area (in sf) | ft² |  | 231,000 |  |  |
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 |  |  |  |
Boston Properties Inc | 415 Main Street [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Gains on sales of real estate |  | $ 60,800 |  |  |
Boston Properties Limited Partnership |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Net income |  |  |  | 252,340 | 208,208
Proceeds from sales of real estate |  |  |  | 104,816 | 194,821
Gains on sales of real estate |  |  |  | 69,792 | 95,084
Revenues |  |  |  | $ 665,985 | $ 618,476
Boston Properties Limited Partnership | 415 Main Street [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Gains on sales of real estate |  | $ 63,000 |  |  |

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- Definition This element represents the amount of gain (loss) on sale of properties during the reporting period gross of the applicable income taxes realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 974 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-15.(a)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6875705&loc=d3e641549-123027 + Details
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