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Noncontrolling Interests Common units distributions (Details) - Boston Properties Limited Partnership - $ / shares
Apr. 30, 2018
Jan. 30, 2018
Jun. 14, 2018
Dividends Payable [Line Items]      
Distributions Declared To OP And LTIP Units Per Unit     $ 0.80
Distributions Declared To MYLTIP Units Per Unit (in dollars per unit)     $ 0.080
Distributions made to OP and LTIP units per unit (in dollars per unit) $ 0.80 $ 0.80  
Distribution paid to MYLTIP Units (in dollars per unit) $ 0.080 $ 0.080