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Real Estate Activity During the Six Months Ended June 30, 2013 (Tables) | 6 Months Ended
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Jun. 30, 2013
Business Acquisition [Line Items] |
Business Acquisition, Pro Forma Information [Table Text Block] |
Pro Forma (Unaudited) | Six Months Ended June 30,
(in thousands, except per share data) | 2013 |  | 2012
Total revenue | $ | 1,119,893 |  |  | $ | 1,065,877 |
Income from continuing operations | $ | 147,627 |  |  | $ | 508,812 |
Net income attributable to Boston Properties, Inc. | $ | 154,077 |  |  | $ | 501,060 |
Basic earnings per share: |  |  |
Net income per share attributable to Boston Properties, Inc. | $ | 1.00 |  |  | $ | 3.33 |
Diluted earnings per share: |  |  |
Net income per share attributable to Boston Properties, Inc. | $ | 0.99 |  |  | $ | 3.32 |
Summary Of The Discontinued Operations Related To Montvale Center, 303 Almaden Blvd and Bedford Business Park | The following table summarizes the income from discontinued operations related to Montvale Center and 303 Almaden Boulevard and the related gain on forgiveness of debt and impairment loss for the three and six months ended June 30, 2013 and 2012 and the gain on sale of real estate and income from discontinued operations for the three and six months ended June 30, 2012 related to the Company's Bedford Business Park properties which were sold on May 17, 2012:
| For the three months ended June 30, |  | For the six months ended June 30,
| 2013 |  | 2012 |  | 2013 |  | 2012
| (in thousands)
Total revenue | $ | 1,529 |  |  | $ | 3,263 |  |  | $ | 3,376 |  |  | $ | 7,784 |
Expenses |  |  |  |  |  |  |
Operating | 656 |  |  | 1,489 |  |  | 1,486 |  |  | 3,392 |
Depreciation and amortization | — |  |  | 907 |  |  | 596 |  |  | 2,310 |
Total expenses | 656 |  |  | 2,396 |  |  | 2,082 |  |  | 5,702 |
Operating income | 873 |  |  | 867 |  |  | 1,294 |  |  | 2,082 |
Other expense |  |  |  |  |  |  |
Interest expense | — |  |  | (649 | ) |  | (360 | ) |  | (1,294 | )
Income from discontinued operations | $ | 873 |  |  | $ | 218 |  |  | $ | 934 |  |  | $ | 788 |
Noncontrolling interest in income from discontinued operations – common units of the Operating Partnership | (88 | ) |  | (23 | ) |  | (94 | ) |  | (84 | )
Income from discontinued operations attributable to Boston Properties, Inc. | $ | 785 |  |  | $ | 195 |  |  | $ | 840 |  |  | $ | 704 |
Gain on sale of real estate from discontinued operations | $ | — |  |  | $ | 36,877 |  |  | $ | — |  |  | $ | 36,877 |
Gain on forgiveness of debt from discontinued operations | — |  |  | — |  |  | 20,182 |  |  | — |
Impairment loss from discontinued operations | — |  |  | — |  |  | (3,241 | ) |  | — |
Noncontrolling interest in gain on sale of real estate, gain on forgiveness of debt and impairment loss from discontinued operations – common units of the Operating Partnership | — |  |  | (4,052 | ) |  | (1,806 | ) |  | (4,075 | )
Gain sale of real estate, gain on forgiveness of debt and impairment loss from discontinued operations attributable to Boston Properties, Inc. | $ | — |  |  | $ | 32,825 |  |  | $ | 15,135 |  |  | $ | 32,802 |
Mountain View Research And Technology Parks [Member] |
Business Acquisition [Line Items] |
Schedule of Business Acquisitions, by Acquisition [Table Text Block] | The following table summarizes the allocation of the aggregate purchase price of Mountain View Research Park and Mountain View Technology Park at the date of acquisition (in thousands).
Land | $ | 126,521 |
Building and improvements | 82,451 |
Tenant improvements | 7,326 |
In-place lease intangibles | 23,279 |
Above-market rents | 843 |
Below-market rents | (7,336 | )
Net assets acquired | $ | 233,084 |
767 Fifth Avenue (The GM Building) [Member] |
Business Acquisition [Line Items] |
Schedule of Business Acquisitions, by Acquisition [Table Text Block] | The following table summarizes the allocation of the aggregate purchase price of 767 Fifth Avenue (the General Motors Building) at the date of consolidation on May 31, 2013 (in thousands).
Real estate and related intangibles recorded upon consolidation |  |
Land | $ | 1,796,252 |  |
Building and improvements | 1,447,446 |  |
Tenant improvements | 85,208 |  |
In-place lease intangibles | 357,781 |  |
Above market rents | 101,897 |  |
Below market rents | (239,641 | ) |
Above market assumed debt adjustments | (192,943 | ) |
| $ | 3,356,000 |  |
Debt recorded upon consolidation |  |
Mortgage notes payable | (1,300,000 | ) |
Mezzanine notes payable | (306,000 | ) |
Related party notes payable | (450,000 | ) | (1)
| $ | (2,056,000 | ) |
Working capital recorded upon consolidation |  |
Cash and cash equivalents | $ | 79,468 |  |
Cash held in escrows | 2,403 |  |
Tenant and other receivables | 7,104 |  |
Prepaid expenses and other assets | 4,269 |  |
Accounts payable and accrued expenses | (2,418 | ) |
Accrued interest payable | (175,802 | ) | (2)
Other liabilities | (6,304 | ) |
| $ | (91,280 | ) |
Noncontrolling interest recorded upon consolidation |  |
Noncontrolling interests | $ | (520,000 | ) |
Noncontrolling interests - working capital | 36,512 |  |
| $ | (483,488 | ) |
Net assets recorded upon consolidation | $ | 725,232 |  |
_______________ (1) The Company's partner loans totaling $270.0 million eliminates in consolidation. (2) The Company's share of the accrued interest payable on the partner loans totaling approximately $105.5 million eliminates in consolidation.

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- Definition Tabular disclosure of disposal groups, which may include the gain (loss) recognized in the income statement and the income statement caption that includes that gain (loss), amounts of revenues and pretax profit or loss reported in discontinued operations, the classification and carrying value of the assets and liabilities comprising the disposal group, and the segment in which the disposal group was reported. Also may include the amount of adjustments to amounts previously reported in discontinued operations such as resolution of contingencies arising from the disposal transaction or the operations of the component prior to disposal. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1510-107760 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2443-110228 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1474-107760 + Details
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