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Unsecured Senior Notes Unsecured Senior Notes (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended
Jan. 20, 2016
Mar. 31, 2016
Mar. 31, 2015
Debt Instrument [Line Items]      
Proceeds from Issuance of Unsecured Debt   $ 997,080 $ 0
Boston Properties Limited Partnership      
Debt Instrument [Line Items]      
Proceeds from Issuance of Unsecured Debt   $ 997,080 $ 0
Boston Properties Limited Partnership | Senior Notes [Member]      
Debt Instrument [Line Items]      
Maximum Leverage Ratio   60.00%  
Maximum Secured Debt Leverage Ratio   50.00%  
Minimum Interest Coverage Ratio   1.50  
Minimum Unencumbered Asset Value Percentage Of Unsecured Debt   150.00%  
Principal Amount   $ 6,300,000  
Unsecured Senior Notes 3.766% | Boston Properties Limited Partnership | Senior Notes [Member]      
Debt Instrument [Line Items]      
Principal Amount $ 1,000,000 $ 1,000,000  
Coupon/Stated Rate 3.65% 3.65%  
Senior Notes Pricing 99.708%    
Effective Rate 3.766% 3.766% [1]  
Proceeds from Issuance of Unsecured Debt $ 988,900    
[1] Yield on issuance date including the effects of discounts on the notes and the amortization of financing costs.