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Real Estate Investments - Schedule of Allocation of Purchase Price of Assets Acquired and Liabilities Assumed (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Cherry Creek [Member]      
Business Acquisition [Line Items]      
Land $ 25,745us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand
/ us-gaap_BusinessAcquisitionAxis
= cio_CherryCreekMember
   
Buildings and improvements 15,771cio_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildingsAndImprovements
/ us-gaap_BusinessAcquisitionAxis
= cio_CherryCreekMember
   
Tenant Improvements 4,372cio_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTenantImprovements
/ us-gaap_BusinessAcquisitionAxis
= cio_CherryCreekMember
   
Acquired intangible assets 12,009us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= cio_CherryCreekMember
   
Accounts payable and other/accrued liabilities (815)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities
/ us-gaap_BusinessAcquisitionAxis
= cio_CherryCreekMember
   
Lease intangible liability (249)cio_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLeaseIntangibleLiabilities
/ us-gaap_BusinessAcquisitionAxis
= cio_CherryCreekMember
   
Fair value of assets and liabilities at acquisition 56,833us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= cio_CherryCreekMember
   
Plaza 25 [Member]      
Business Acquisition [Line Items]      
Land 1,764us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand
/ us-gaap_BusinessAcquisitionAxis
= cio_PlazaTwentyFiveMember
   
Buildings and improvements 18,487cio_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildingsAndImprovements
/ us-gaap_BusinessAcquisitionAxis
= cio_PlazaTwentyFiveMember
   
Tenant Improvements 2,076cio_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTenantImprovements
/ us-gaap_BusinessAcquisitionAxis
= cio_PlazaTwentyFiveMember
   
Prepaid expenses and other assets 2us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets
/ us-gaap_BusinessAcquisitionAxis
= cio_PlazaTwentyFiveMember
   
Acquired intangible assets 2,924us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= cio_PlazaTwentyFiveMember
   
Accounts payable and other/accrued liabilities (641)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities
/ us-gaap_BusinessAcquisitionAxis
= cio_PlazaTwentyFiveMember
   
Lease intangible liability (328)cio_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLeaseIntangibleLiabilities
/ us-gaap_BusinessAcquisitionAxis
= cio_PlazaTwentyFiveMember
   
Fair value of assets and liabilities at acquisition 24,284us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= cio_PlazaTwentyFiveMember
   
Lake Vista Pointe [Member]      
Business Acquisition [Line Items]      
Land 4,115us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand
/ us-gaap_BusinessAcquisitionAxis
= cio_LakeVistaPointeMember
   
Buildings and improvements 17,562cio_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildingsAndImprovements
/ us-gaap_BusinessAcquisitionAxis
= cio_LakeVistaPointeMember
   
Tenant Improvements 3,038cio_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTenantImprovements
/ us-gaap_BusinessAcquisitionAxis
= cio_LakeVistaPointeMember
   
Prepaid expenses and other assets 30us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets
/ us-gaap_BusinessAcquisitionAxis
= cio_LakeVistaPointeMember
   
Acquired intangible assets 3,685us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= cio_LakeVistaPointeMember
   
Accounts payable and other/accrued liabilities (1,733)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities
/ us-gaap_BusinessAcquisitionAxis
= cio_LakeVistaPointeMember
   
Fair value of assets and liabilities at acquisition 26,697us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= cio_LakeVistaPointeMember
   
Florida Research Park [Member]      
Business Acquisition [Line Items]      
Land 4,415us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand
/ us-gaap_BusinessAcquisitionAxis
= cio_FloridaResearchParkMember
   
Buildings and improvements 16,376cio_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildingsAndImprovements
/ us-gaap_BusinessAcquisitionAxis
= cio_FloridaResearchParkMember
   
Tenant Improvements 1,399cio_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTenantImprovements
/ us-gaap_BusinessAcquisitionAxis
= cio_FloridaResearchParkMember
   
Prepaid expenses and other assets 104us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets
/ us-gaap_BusinessAcquisitionAxis
= cio_FloridaResearchParkMember
   
Acquired intangible assets 4,309us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= cio_FloridaResearchParkMember
   
Accounts payable and other/accrued liabilities (41)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities
/ us-gaap_BusinessAcquisitionAxis
= cio_FloridaResearchParkMember
   
Fair value of assets and liabilities at acquisition 26,562us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= cio_FloridaResearchParkMember
   
Washington Group Plaza [Member]      
Business Acquisition [Line Items]      
Land   12,748us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand
/ us-gaap_BusinessAcquisitionAxis
= cio_WashingtonGroupPlazaMember
 
Buildings and improvements   18,000cio_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildingsAndImprovements
/ us-gaap_BusinessAcquisitionAxis
= cio_WashingtonGroupPlazaMember
 
Tenant Improvements   2,717cio_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTenantImprovements
/ us-gaap_BusinessAcquisitionAxis
= cio_WashingtonGroupPlazaMember
 
Prepaid expenses and other assets   219us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets
/ us-gaap_BusinessAcquisitionAxis
= cio_WashingtonGroupPlazaMember
 
Deferred leasing costs   12cio_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredLeasingCosts
/ us-gaap_BusinessAcquisitionAxis
= cio_WashingtonGroupPlazaMember
 
Acquired intangible assets   10,470us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= cio_WashingtonGroupPlazaMember
 
Accounts payable and other/accrued liabilities   (1,234)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities
/ us-gaap_BusinessAcquisitionAxis
= cio_WashingtonGroupPlazaMember
 
Acquired intangible liabilities   (18)cio_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleLiabilities
/ us-gaap_BusinessAcquisitionAxis
= cio_WashingtonGroupPlazaMember
 
Fair value of assets and liabilities at acquisition   42,914us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= cio_WashingtonGroupPlazaMember
 
Corporate Parkway [Member]      
Business Acquisition [Line Items]      
Land   3,756us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand
/ us-gaap_BusinessAcquisitionAxis
= cio_CorporateParkwayMember
 
Buildings and improvements   18,580cio_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildingsAndImprovements
/ us-gaap_BusinessAcquisitionAxis
= cio_CorporateParkwayMember
 
Tenant Improvements   1,909cio_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTenantImprovements
/ us-gaap_BusinessAcquisitionAxis
= cio_CorporateParkwayMember
 
Prepaid expenses and other assets   6us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets
/ us-gaap_BusinessAcquisitionAxis
= cio_CorporateParkwayMember
 
Acquired intangible assets   4,149us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= cio_CorporateParkwayMember
 
Fair value of assets and liabilities at acquisition   28,400us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= cio_CorporateParkwayMember
 
Washington Group Plaza and Corporate Parkway [Member]      
Business Acquisition [Line Items]      
Land   16,504us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand
/ us-gaap_BusinessAcquisitionAxis
= cio_WashingtonGroupPlazaAndCorporateParkwayMember
 
Buildings and improvements   36,580cio_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildingsAndImprovements
/ us-gaap_BusinessAcquisitionAxis
= cio_WashingtonGroupPlazaAndCorporateParkwayMember
 
Tenant Improvements   4,626cio_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTenantImprovements
/ us-gaap_BusinessAcquisitionAxis
= cio_WashingtonGroupPlazaAndCorporateParkwayMember
 
Prepaid expenses and other assets   225us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets
/ us-gaap_BusinessAcquisitionAxis
= cio_WashingtonGroupPlazaAndCorporateParkwayMember
 
Deferred leasing costs   12cio_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredLeasingCosts
/ us-gaap_BusinessAcquisitionAxis
= cio_WashingtonGroupPlazaAndCorporateParkwayMember
 
Acquired intangible assets   14,619us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= cio_WashingtonGroupPlazaAndCorporateParkwayMember
 
Accounts payable and other/accrued liabilities   (1,234)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities
/ us-gaap_BusinessAcquisitionAxis
= cio_WashingtonGroupPlazaAndCorporateParkwayMember
 
Acquired intangible liabilities   (18)cio_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleLiabilities
/ us-gaap_BusinessAcquisitionAxis
= cio_WashingtonGroupPlazaAndCorporateParkwayMember
 
Fair value of assets and liabilities at acquisition   71,314us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= cio_WashingtonGroupPlazaAndCorporateParkwayMember
 
Central Fairwinds [Member]      
Business Acquisition [Line Items]      
Land     1,747us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand
/ us-gaap_BusinessAcquisitionAxis
= cio_CentralFairwindsMember
Buildings and improvements     9,073cio_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildingsAndImprovements
/ us-gaap_BusinessAcquisitionAxis
= cio_CentralFairwindsMember
Tenant Improvements     678cio_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTenantImprovements
/ us-gaap_BusinessAcquisitionAxis
= cio_CentralFairwindsMember
Prepaid expenses and other assets     57us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets
/ us-gaap_BusinessAcquisitionAxis
= cio_CentralFairwindsMember
Acquired intangible assets     2,645us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= cio_CentralFairwindsMember
Accounts payable and other/accrued liabilities     (312)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities
/ us-gaap_BusinessAcquisitionAxis
= cio_CentralFairwindsMember
Fair value of assets and liabilities at acquisition     $ 13,888us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= cio_CentralFairwindsMember