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Summary Of Significant Accounting Policies (Narrative) (Details) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jan. 01, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) yr | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Entity Information [Line Items] |  |  |  |  |  |  |
Maximum Period After Construction The Company Considers A Construction Project As Substantially Completed (In Years) | yr |  |  |  | 1 |  |  |
Interest costs capitalized |  |  |  | $ 65,766,000 | $ 61,070,000 | $ 39,200,000 |
Salaries And Related Costs Capitalized |  |  |  | 12,500,000 | 13,200,000 | 11,100,000 |
Cash FDIC Insured Limit |  | $ 250,000 |  | 250,000 |  |  |
Separate Unrestricted Cash For Deferred Compensation Plan. |  | 28,200,000 |  | 28,200,000 | 29,200,000 |  |
Gains (losses) from investments in securities |  |  |  | (1,865,000) | 3,678,000 | 2,273,000 |
Internal Leasing Salaries And Related Costs Capitalized |  |  |  | 5,400,000 | 5,000,000 | 7,200,000 |
Straight-line rent adjustments |  |  |  | (51,900,000) | (54,800,000) | (31,700,000) |
Above and below market rent adjustments, net |  |  |  | $ 23,800,000 | 23,500,000 | 30,200,000 |
Ground Lease Expiration Date, Maximum |  |  |  | 2114 |  |  |
REIT Annual Taxable Income Distribution Requirement Percentage, Minimum |  |  |  | 90.00% |  |  |
Company Annual Taxable Income Distribution Percentage |  |  |  | 100.00% |  |  |
Debt Issuance Costs, Net |  | 30,756,000 |  | $ 30,756,000 |  |  |
Cumulative effect of a change in accounting principle |  |  |  | (5,496,000) | 2,035,000 |  |
Payroll and related costs from management services contracts |  |  |  | 9,590,000 | 0 | 0 |
Direct reimbursements of payroll and related costs from management services contracts |  |  |  | 9,590,000 | 0 | 0 |
Net Cash Provided by (Used in) Operating Activities |  |  |  | 1,150,245,000 | 911,979,000 | 1,034,548,000 |
Net Cash Provided by (Used in) Investing Activities |  |  |  | 1,098,876,000 | 882,044,000 | 1,337,347,000 |
Net Cash Provided by (Used in) Financing Activities |  |  |  | 82,453,000 | 55,346,000 | (74,621,000) |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents |  | 639,191,000 |  | 639,191,000 | 505,369,000 | 420,088,000 | $ 797,508,000
Interest Expense |  |  |  | 378,168,000 | 374,481,000 | 412,849,000 |
Boston Properties Limited Partnership |  |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |  |
Interest costs capitalized |  |  |  | 65,766,000 | 61,070,000 | 39,237,000 |
Gains (losses) from investments in securities |  |  |  | (1,865,000) | 3,678,000 | 2,273,000 |
Debt Issuance Costs, Net |  | 30,800,000 |  | 30,800,000 |  |  |
Cumulative effect of a change in accounting principle |  |  |  | (4,933,000) | 272,000 |  |
Payroll and related costs from management services contracts |  |  |  | 9,590,000 | 0 | 0 |
Direct reimbursements of payroll and related costs from management services contracts |  |  |  | 9,590,000 | 0 | 0 |
Net Cash Provided by (Used in) Operating Activities |  |  |  | 1,150,245,000 | 911,979,000 | 1,034,548,000 |
Net Cash Provided by (Used in) Investing Activities |  |  |  | 1,098,876,000 | 882,044,000 | 1,337,347,000 |
Net Cash Provided by (Used in) Financing Activities |  |  |  | 82,453,000 | 55,346,000 | (74,621,000) |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents |  | 639,191,000 |  | 639,191,000 | 505,369,000 | 420,088,000 | $ 797,508,000
Interest Expense |  |  |  | 378,168,000 | 374,481,000 | 412,849,000 |
Dividends In Excess Of Earnings [Member] |  |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |  |
Cumulative effect of a change in accounting principle |  |  |  | (4,933,000) | 272,000 |  |
Noncontrolling Interests [Member] |  |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |  |
Cumulative effect of a change in accounting principle |  |  |  | (563,000) | 1,763,000 |  |
Noncontrolling Interests [Member] | Boston Properties Limited Partnership |  |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |  |
Cumulative effect of a change in accounting principle |  |  |  | (563,000) | 1,763,000 |  |
Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |  |
Cumulative effect of a change in accounting principle |  |  | $ (4,900,000) |  |  |  |
Accounting Standards Update 2014-09 [Member] | Noncontrolling Interests [Member] |  |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |  |
Cumulative effect of a change in accounting principle |  |  | $ (600,000) |  |  |  |
Accounting Standards Update 2016-15 [Member] |  |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |  |
Non Cash Portion Of Loss From Early Extinguishment Of Debt |  |  |  | $ 16,000,000 | 12,800,000 |  |
Accounting Standards Update 2016-18 [Member] |  |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |  |
Net Cash Provided by (Used in) Operating Activities |  |  |  |  | 4,500,000 | (2,300,000) |
Net Cash Provided by (Used in) Investing Activities |  |  |  |  | (15,800,000) | 8,300,000 |
Net Cash Provided by (Used in) Financing Activities |  |  |  |  | (12,900,000) |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents |  |  |  |  | $ 7,400,000 | $ 10,600,000 |
Accounting Standards Update 2017-12 [Member] |  |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |  |
Interest Expense |  | $ 1,700,000 |  |  |  |  |
Subsequent Event [Member] | Accounting Standards Update 2016-02 [Member] |  |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |  |
Cumulative effect of a change in accounting principle | $ (4,000,000) |  |  |  |  |  |
Operating Lease, Right-of-Use Asset | 148,800,000 |  |  |  |  |  |
Operating Lease, Liability | $ 199,700,000 |  |  |  |  |  |

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