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Summary Of Significant Accounting Policies GAAP Reconciliation Of Net Income To Taxable Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Entity Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income attributable to the Company | $ 103,829 | $ 117,337 | $ 133,709 | $ 97,083 | $ 147,214 | $ 76,753 | $ 96,597 | $ 181,747 | $ 462,439 | $ 512,785 | $ 583,106
Straight line rent and net above and below-market rent adjustments |  |  |  |  |  |  |  |  | (77,801) | (65,861) | (92,483)
Book/tax differences from depreciation and amortization |  |  |  |  |  |  |  |  | 142,234 | 235,819 | 307,115
Book/Tax differences from interest expense |  |  |  |  |  |  |  |  | (18,136) | (36,223) | (43,349)
Book/tax differences on gains/(losses) from capital transactions |  |  |  |  |  |  |  |  | 1,123 | (70,880) | (74,482)
Book/tax differences from stock-based compensation |  |  |  |  |  |  |  |  | 37,990 | 33,463 | 22,008
Tangible Property Regulations |  |  |  |  |  |  |  |  | (116,265) | (104,783) | (74,887)
Other book/tax differences, net |  |  |  |  |  |  |  |  | 33,411 | (6,121) | (15,259)
Taxable Income |  |  |  |  |  |  |  |  | 464,995 | 498,199 | 611,769
Boston Properties Limited Partnership |  |  |  |  |  |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income attributable to the Company | $ 117,667 | $ 132,693 | $ 151,844 | $ 110,662 | $ 166,801 | $ 91,306 | $ 109,938 | $ 207,296 | 523,366 | 585,841 | 659,248
Straight line rent and net above and below-market rent adjustments |  |  |  |  |  |  |  |  | (86,773) | (73,604) | (103,227)
Book/tax differences from depreciation and amortization |  |  |  |  |  |  |  |  | 144,436 | 245,239 | 329,629
Book/Tax differences from interest expense |  |  |  |  |  |  |  |  | (20,227) | (40,481) | (48,385)
Book/tax differences on gains/(losses) from capital transactions |  |  |  |  |  |  |  |  | 784 | (69,683) | (67,602)
Book/tax differences from stock-based compensation |  |  |  |  |  |  |  |  | 42,371 | 37,397 | 24,565
Tangible Property Regulations |  |  |  |  |  |  |  |  | (129,673) | (117,102) | (83,587)
Other book/tax differences, net |  |  |  |  |  |  |  |  | 37,607 | (3,387) | (14,561)
Taxable Income |  |  |  |  |  |  |  |  | $ 511,891 | $ 564,220 | $ 696,080

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