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Unsecured Credit Facility (Details) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 24, 2017
Dec. 31, 2019
Dec. 31, 2018
Apr. 24, 2018
Apr. 23, 2017
Line of Credit Facility [Line Items]          
Unsecured term loan, net   $ 498,939 $ 498,488    
Document Period End Date   Dec. 31, 2019      
Long-term Line of Credit   $ 0 0    
Line of Credit Facility, Covenant Compliance   At December 31, 2019, Boston Properties Limited Partnership was in compliance with each of these financial and other covenant requirements.      
Revolving Credit Facility [Member]          
Line of Credit Facility [Line Items]          
Line of Credit Facility, Current Borrowing Capacity $ 1,500,000       $ 1,000,000
Potential increase to line of credit $ 500,000        
Competitive bid quote 65.00%        
Long-term Line of Credit   $ 0 0    
Line of Credit Facility, Covenant Terms   Among other covenants, the 2017 Credit Facility requires that Boston Properties Limited Partnership maintain on an ongoing basis: (1) a leverage ratio not to exceed 60%, however, the leverage ratio may increase to no greater than 65% provided that it is reduced back to 60% within one year, (2) a secured debt leverage ratio not to exceed 55%, (3) a fixed charge coverage ratio of at least 1.40, (4) an unsecured debt leverage ratio not to exceed 60%, however, the unsecured debt leverage ratio may increase to no greater than 65% provided that it is reduced to 60% within one year, (5) an unsecured debt interest coverage ratio of at least 1.75 and (6) limitations on permitted investments.      
Delayed Draw Facility [Member]          
Line of Credit Facility [Line Items]          
Line of Credit Facility, Current Borrowing Capacity $ 500,000        
Unsecured term loan, net       $ 500,000  
Margin added to Calculated Interest Rate       0.90%  
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.15%        
Long-term Line of Credit   $ 500,000 $ 500,000    
Line of Credit [Member]          
Line of Credit Facility [Line Items]          
Line of Credit Facility, Interest Rate Description At Boston Properties Limited Partnership’s option, loans under the Revolving Facility and Delayed Draw Facility will bear interest at a rate per annum equal to (1) (a) in the case of loans denominated in Dollars, Euro or Sterling, LIBOR, and (b) in the case of loans denominated in Canadian Dollars, CDOR, in each case, plus a margin ranging from 77.5 to 155 basis points for the Revolving Commitment and 85 to 175 basis points for the Delayed Draw Facility, based on Boston Properties Limited Partnership’s credit rating or (2) an alternate base rate equal to the greatest of (x) the Administrative Agent’s prime rate, (y) the Federal Funds rate plus 0.50% or (z) LIBOR for a one-month period plus 1.00%, in each case, plus a margin ranging from 0 to 55 basis points for the Revolving Facility and 0 to 75 basis points for the Delayed Draw Facility, based on Boston Properties Limited Partnership’s credit rating.        
Minimum [Member] | Revolving Credit Facility [Member]          
Line of Credit Facility [Line Items]          
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.10%        
Maximum [Member] | Revolving Credit Facility [Member]          
Line of Credit Facility [Line Items]          
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.30%        
Current credit rating [Member] | Revolving Credit Facility [Member]          
Line of Credit Facility [Line Items]          
Margin added to Calculated Interest Rate   0.825%      
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage   0.125%      
Current credit rating [Member] | Delayed Draw Facility [Member]          
Line of Credit Facility [Line Items]          
Margin added to Calculated Interest Rate   0.90%