XML 115 R89.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Stock Option Rollforward Table (Details) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Text Block [Abstract] |  |  |
Beginning outstanding, shares | 351,561 | 395,353 | 540,441
Exercised | (247,920) | (43,792) | (145,088)
Ending outstanding, shares | 103,641 | 351,561 | 395,353
Beginning outstanding, Weighted-average Exercise Price | $ 96.97 | $ 96.37 | $ 96.35
Weighted Average Exercise Price | 96.95 | 91.60 | 96.27
Ending outstanding, Weighted-average Exercise Price | $ 97.01 | $ 96.97 | $ 96.37

X
- Definition Exercised Weighted Averge Exercise Price + References No definition available. + Details
Name: | bxp_ExercisedWeightedAvergeExercisePrice
Namespace Prefix: | bxp_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Stock Issued During Period Shares Stock Options Exercise + References No definition available. + Details
Name: | bxp_StockIssuedDuringPeriodSharesStockOptionsExercise
Namespace Prefix: | bxp_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_TextBlockAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration