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The Combination Fair Value of Purchase Consideration and Assets/Liabilities (Details) |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 25, 2017 USD ($) | Jul. 18, 2017 USD ($) | Jun. 30, 2018 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Cash |  |  |  |  | $ 28,000,000.0 |
Noncontrolling interests in consolidated subsidiaries |  |  |  |  | (5,550,000) |
Repayment of notes receivable |  |  |  | $ 0 | 0 | $ 50,934,000
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Bargain Purchase, Reduction Of Gain |  |  | $ (7,600,000) | $ 0 | (7,606,000) | 24,376,000
JBG Companies [Member] |  |  |  |  |  |
Common shares and OP Units |  | $ 1,224,885,000 |  |  |  |
Cash |  | 20,573,000 |  |  |  |
Total consideration paid |  | 1,245,458,000 |  |  |  |
Land and improvements |  | 338,072,000 |  |  |  |
Building and improvements |  | 609,156,000 |  |  |  |
Construction in progress, including land |  | 699,800,000 |  |  |  |
Leasehold improvements and equipment |  | 7,890,000 |  |  |  |
Real estate |  | 1,654,918,000 |  |  |  |
Cash |  | 104,529,000 |  |  |  |
Restricted cash |  | 13,460,000 |  |  |  |
Investments in unconsolidated real estate ventures |  | 241,142,000 |  |  |  |
Identified intangible assets |  | 138,371,000 |  |  |  |
Notes receivable (1) |  | 50,934,000 |  |  |  |
Identified intangible liabilities |  | (8,687,000) |  |  |  |
Mortgages payable assumed (2) |  | (768,523,000) |  |  |  |
Capital lease obligations assumed (3) |  | (33,543,000) |  |  |  |
Lease assumption liabilities (4) |  | (48,127,000) |  |  |  |
Deferred tax liability (5) |  | (18,610,000) |  |  |  |
Other liabilities acquired, net |  | (60,048,000) |  |  |  |
Noncontrolling interests in consolidated subsidiaries |  | (3,588,000) |  |  |  |
Net assets acquired |  | 1,262,228,000 |  |  |  |
Gain on bargain purchase (6) |  | $ 16,770,000 |  |  |  |
Repayment of notes receivable |  |  |  |  |  | $ 50,900,000
Capital Leased Assets, Number of Units |  | 2 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Lease Liabilities, Future Payments |  | $ 14,000,000.0 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Lease Liabilities, Relocation of Tenants |  | $ 34,100,000 |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Real Estate Investments, Unconsolidated Real Estate Investments |  |  |  |  | 468,000 |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Lease Liabilities |  |  |  |  | 4,700,000 |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Current Liabilities, Other |  |  |  |  | $ 2,400,000 |
JBG Companies [Member] | Reston, Virginia [Member] |  |  |  |  |  |
Capital Leased Assets, Number of Units | 1 |  |  |  |  |
Payments to Acquire Land | $ 19,500,000 |  |  |  |  |

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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6613-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6578-128477 + Details
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- Definition Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6613-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6578-128477 + Details
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- Definition Amount of facility held for productive use including, but not limited to, office, production, storage and distribution facilities, acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition Amount of other liabilities due within one year or within the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition Amount of deferred tax liability attributable to taxable temporary differences assumed at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e31917-109318 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition The amount of property, plant, and equipment recognized as of the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=108330185&loc=d3e2207-128464 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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