XML 59 R44.htm IDEA: XBRL DOCUMENT v3.10.0.1
Noncontrolling Interests Common units for Boston Properties Limited Partnership (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Noncontrolling Interest [Line Items]      
Conversion of redeemable partnership units   $ 0  
Cumulative effect of a change in accounting principle $ 5,496 (2,035)  
Other comprehensive income (45,137)   $ (50,429)
Noncontrolling Interests [Member]      
Noncontrolling Interest [Line Items]      
Conversion of redeemable partnership units 18,023 16,986  
Cumulative effect of a change in accounting principle 563 (1,763)  
Boston Properties Limited Partnership      
Noncontrolling Interest [Line Items]      
Cumulative effect of a change in accounting principle 4,933 (272)  
Boston Properties Limited Partnership | Noncontrolling Interests [Member]      
Noncontrolling Interest [Line Items]      
Beginning balance 2,292,263 2,262,040  
Contributions 34,970 31,465  
Net income 49,128 40,350  
Distributions (45,730) (40,292)  
Conversion of redeemable partnership units (2,112) (16,812)  
Unearned compensation (5,754) (5,194)  
Cumulative effect of a change in accounting principle 563 (1,763)  
Other comprehensive income 599 52  
Adjustments to reflect redeemable preferred units at redemption value (133,263) (103,556)  
Ending balance $ 2,190,664 $ 2,166,290