XML 77 R60.htm IDEA: XBRL DOCUMENT v3.5.0.2
Noncontrolling Interests Common units for Boston Properties LImited Partnership (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Noncontrolling Interest [Line Items]        
Conversion of redeemable partnership units   $ 0    
Accumulated Other Comprehensive Income (Loss) $ (73,943) (20,625) $ (14,114) $ (9,304)
Noncontrolling Interests [Member]        
Noncontrolling Interest [Line Items]        
Conversion of redeemable partnership units (10,094) (12,577)    
Boston Properties Limited Partnership        
Noncontrolling Interest [Line Items]        
Accumulated Other Comprehensive Income (Loss) (85,043) (25,601) $ (18,337) $ (12,973)
Boston Properties Limited Partnership | Noncontrolling Interests [Member]        
Noncontrolling Interest [Line Items]        
Beginning balance 2,286,689 2,310,046    
Contributions 31,492 39,036    
Net Income 42,120 50,906    
Distributions (35,500) (35,307)    
Conversion of redeemable partnership units (5,881) (14,157)    
Unearned Compensation (10,072) (9,729)    
Accumulated Other Comprehensive Income (Loss) (6,877) (1,307)    
Adjustments To Reflect Redeemable Preferred Units At Redemption Value 151,545 (216,037)    
Ending balance $ 2,453,516 $ 2,123,451