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Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Allowance for doubtful accounts - AR | $ 784 us-gaap_AllowanceForDoubtfulAccountsReceivable | $ 717 us-gaap_AllowanceForDoubtfulAccountsReceivable
Allowance - Deferred rent receivable | 1,695 ofc_AllowanceforDoubtfulAccountsDeferredRent | 1,418 ofc_AllowanceforDoubtfulAccountsDeferredRent
Preferred Shares of beneficial interest, par value (in dollars per share) | $ 0.01 us-gaap_PreferredStockParOrStatedValuePerShare | $ 0.01 us-gaap_PreferredStockParOrStatedValuePerShare
Preferred Shares of beneficial interest, shares authorized | 25,000,000 us-gaap_PreferredStockSharesAuthorized | 25,000,000 us-gaap_PreferredStockSharesAuthorized
Preferred Shares of beneficial interest, shares issued | 7,431,667 us-gaap_PreferredStockSharesIssued | 7,431,667 us-gaap_PreferredStockSharesIssued
Preferred Shares of beneficial interest, shares outstanding | 7,431,667 us-gaap_PreferredStockSharesOutstanding | 7,431,667 us-gaap_PreferredStockSharesOutstanding
Common Shares of beneficial interest, par value (in dollars per share) | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare
Common Shares of beneficial interest, shares authorized | 125,000,000 us-gaap_CommonStockSharesAuthorized | 125,000,000 us-gaap_CommonStockSharesAuthorized
Common Stock, Shares, Issued | 94,536,269 us-gaap_CommonStockSharesIssued | 93,255,284 us-gaap_CommonStockSharesIssued
Common Shares of beneficial interest, shares outstanding | 94,536,269 us-gaap_CommonStockSharesOutstanding | 93,255,284 us-gaap_CommonStockSharesOutstanding
Corporate Office Properties, L.P. |  |
Allowance for doubtful accounts - AR | 784 us-gaap_AllowanceForDoubtfulAccountsReceivable / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 717 us-gaap_AllowanceForDoubtfulAccountsReceivable / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Allowance - Deferred rent receivable | $ 1,695 ofc_AllowanceforDoubtfulAccountsDeferredRent / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | $ 1,418 ofc_AllowanceforDoubtfulAccountsDeferredRent / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Corporate Office Properties, L.P. | General Partner |  |
Common Shares of beneficial interest, shares outstanding | 94,536,269 us-gaap_CommonStockSharesOutstanding / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember | 93,255,284 us-gaap_CommonStockSharesOutstanding / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember
Preferred Units, Outstanding | 7,431,667 us-gaap_PreferredUnitsOutstanding / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember | 7,431,667 us-gaap_PreferredUnitsOutstanding / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember
Corporate Office Properties, L.P. | Limited Partner |  |
Common Shares of beneficial interest, shares outstanding | 3,679,551 us-gaap_CommonStockSharesOutstanding / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_LimitedPartnerMember | 3,837,551 us-gaap_CommonStockSharesOutstanding / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_LimitedPartnerMember
Preferred Units, Outstanding | 352,000 us-gaap_PreferredUnitsOutstanding / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_LimitedPartnerMember | 352,000 us-gaap_PreferredUnitsOutstanding / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_LimitedPartnerMember

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