Organization (Details 2) |
12 Months Ended | |
|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
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| Corporate Office Properties, L.P. [Member] | Common Units [Member] | ||
| Forms of ownership in Operating Partnership and ownership percentage by the entity | ||
| Percentage ownership in operating partnership | 96.90% | 96.50% |
| X | ||||||||||
- Definition Line items related to the percentage of classes of ownership in a subsidiary that are owned by the parent. No definition available.
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| X | ||||||||||
- Definition Percentage investment held by the managing member or general partner of the limited liability company (LLC) or limited partnership (LP). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Details
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| X | ||||||||||
- Details
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