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Noncontrolling Interests (Tables)
 12 Months Ended
Dec. 31, 2017
Entity Information [Line Items]  
Dividends Declared [Table Text Block]
The following table presents Boston Properties, Inc.’s dividends per share and Boston Properties Limited Partnership’s distributions per OP Unit and LTIP Unit paid or payable in 2017:
Record Date
 
Payment Date
 
Dividend (Per Share)

 
Distribution (Per Unit)

December 29, 2017
 
January 30, 2018
 

$0.80

 

$0.80

September 29, 2017
 
October 31, 2017
 
0.75

 
0.75

June 30, 2017
 
July 31, 2017
 
0.75

 
0.75

March 31, 2017
 
April 28, 2017
 
0.75

 
0.75

December 31, 2016
 
January 30, 2017
 
0.75

 
0.75
Schedule of Redeemable Interest in Property Partnerships [Table Text Block]
The following table reflects the activity of the noncontrolling interest—redeemable interest in property partnership in the Company’s Fountain Square consolidated entity for the year ended December 31, 2015 (in thousands):
Balance at December 31, 2014
$
104,692

Net loss
(7
)
Distributions
(2,900
)
Adjustment to reflect redeemable interest at redemption value
5,128

Acquisition of interest
(106,913
)
Balance at December 31, 2015
$
—
Schedule Of Noncontrolling Interest Property Partnerships [Table Text Block]
The following table reflects the activity of the noncontrolling interests—property partnerships for the years ended December 31, 2017, 2016 and 2015 (in thousands):
Balance at December 31, 2014
$
1,602,467

Capital contributions
3,758

Dissolution
(4,082
)
Net income
144,734

Accumulated other comprehensive loss
(2,428
)
Distributions
(170,049
)
Balance at December 31, 2015
1,574,400

Capital contributions
10,756

Net loss
(2,068
)
Accumulated other comprehensive loss
(877
)
Distributions
(51,564
)
Balance at December 31, 2016
1,530,647

Capital contributions (1)
161,585

Net loss
47,832

Accumulated other comprehensive loss
(2,128
)
Distributions
(54,176
)
Balance at December 31, 2017
$
1,683,760
Boston Properties, Inc. [Member]  
Entity Information [Line Items]  
Schedule Of Redeemable Preferred Units of the Operating Partnership
The following table reflects the activity of the noncontrolling interests—redeemable preferred units for the year ended December 31, 2015 (in thousands): 
Balance at December 31, 2014
$
633

Net income
6

Distributions
(6
)
Redemption of redeemable preferred units (Series Four Preferred Units)
(633
)
Balance at December 31, 2015
$
—
Boston Properties Limited Partnership  
Entity Information [Line Items]  
Schedule Of Redeemable Preferred Units of the Operating Partnership
Balance at December 31, 2014
$
633

Net income
6

Distributions
(6
)
Redemption of redeemable preferred units (Series Four Preferred Units)
(633
)
Balance at December 31, 2015
$
—
Schedule Of Noncontrolling Interest Common Units [Table Text Block]
The following table reflects the activity of noncontrolling interests—redeemable common units of Boston Properties Limited Partnership for the years ended December 31, 2017, 2016 and 2015 (in thousands):
Balance at December 31, 2014
$
2,310,046

Contributions
39,030

Net income
66,951

Distributions
(69,447
)
Conversion of redeemable partnership units
(14,343
)
Unearned compensation
(4,579
)
Other comprehensive loss
(554
)
Adjustment to reflect redeemable partnership units at redemption value
(40,415
)
Balance at December 31, 2015
2,286,689

Contributions
31,395

Net income
59,260

Distributions
(49,087
)
Conversion of redeemable partnership units
(6,461
)
Unearned compensation
(3,464
)
Other comprehensive loss
(4,379
)
Adjustment to reflect redeemable partnership units at redemption value
(51,913
)
Balance at December 31, 2016
2,262,040

Contributions
31,743

Net income
52,210

Distributions
(54,494
)
Conversion of redeemable partnership units
(16,916
)
Unearned compensation
1,650

Cumulative effect of a change in accounting principle
(1,763
)
Other comprehensive income
206

Adjustment to reflect redeemable partnership units at redemption value
17,587

Balance at December 31, 2017
$
2,292,263
Noncontrolling Interests [Member]  
Entity Information [Line Items]  
Dividends Declared [Table Text Block]
:
Record Date
 
Payment Date
 
Distributions per OP Unit and LTIP Unit
 
Distributions per MYLTIP Unit
December 29, 2017
 
January 30, 2018
 

$0.80

 

$0.080

September 29, 2017
 
October 31, 2017
 

$0.75

 

$0.075

June 30, 2017
 
July 31, 2017
 

$0.75

 

$0.075

March 31, 2017
 
April 28, 2017
 

$0.75

 

$0.075

December 31, 2016
 
January 30, 2017
 

$0.75

 

$0.075