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Revenue Recognition on Construction Contract and Other Service Revenues (Details 1) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Disaggregation of Revenue [Line Items] |  |
Construction contract and other service revenues | $ 27,198 | $ 13,034
Construction |  |
Disaggregation of Revenue [Line Items] |  |
Construction contract and other service revenues | 25,915 | 10,091
Design |  |
Disaggregation of Revenue [Line Items] |  |
Construction contract and other service revenues | 1,064 | 2,713
Other |  |
Disaggregation of Revenue [Line Items] |  |
Construction contract and other service revenues | 219 | 230
GMP |  |
Disaggregation of Revenue [Line Items] |  |
Construction contract and other service revenues | 20,486 | 6,589
FFP |  |
Disaggregation of Revenue [Line Items] |  |
Construction contract and other service revenues | 6,435 | 6,198
Cost-plus fee |  |
Disaggregation of Revenue [Line Items] |  |
Construction contract and other service revenues | 58 | 17
Other |  |
Disaggregation of Revenue [Line Items] |  |
Construction contract and other service revenues | $ 219 | $ 230

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- Definition Amount of revenue earned from products sold or services provided under the terms of a contract, including, but not limited to, government contracts and construction contracts, classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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Namespace Prefix: |
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Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_ContractWithCustomerBasisOfPricingAxis=ofc_GuaranteedMaximumPriceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_ContractWithCustomerBasisOfPricingAxis=us-gaap_FixedPriceContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |