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Derivative Instruments and Hedging Activities Derivative Instruments and Hedging Activities Changes in Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Accumulated Other Comprehensive Income or Loss [Roll Forward]          
Beginning Balance     $ (14,114) $ (9,304) $ (9,304)
Effective portion of interest rate contracts $ (32,351) $ 15,639 (90,997) 12,106  
Amortization of interest rate contracts [1] 628 628 1,255 [2] 1,255 [2]  
Other comprehensive loss attributable to noncontrolling interests 8,681 (2,512) 24,108 (2,209)  
Ending Balance (79,748) 1,848 (79,748) 1,848 (14,114)
Boston Properties Limited Partnership          
Accumulated Other Comprehensive Income or Loss [Roll Forward]          
Beginning Balance     (18,337) (12,973) (12,973)
Effective portion of interest rate contracts (32,351) 15,639 (90,997) 12,106  
Amortization of interest rate contracts 628 [3] 628 [3] 1,255 [2] 1,255 [2]  
Other comprehensive loss attributable to noncontrolling interests     16,547 (916)  
Ending Balance $ (91,532) $ (528) $ (91,532) $ (528) $ (18,337)
[1] Amounts reclassified from comprehensive income primarily to interest expense within the Boston Properties, Inc.’s Consolidated Statements of Operations.
[2] Consists of amounts from previous interest rate hedging programs entered into prior to 2015.
[3] Amounts reclassified from comprehensive income primarily to interest expense within the Boston Properties Limited Partnership's Consolidated Statements of Operations.