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Commitments and Contingencies - Additional Information (Detail) (USD $)
9 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2014
Other Commitments [Line Items]    
Estimated fair value of earn-out liability $ 8,000,000cio_EstimatedFairValueOfEarnOutLiability $ 8,000,000cio_EstimatedFairValueOfEarnOutLiability
Change in fair value of earn-out $ 1,048,000cio_ChangeInFairValueOfEarnOutLiability $ 1,048,000cio_ChangeInFairValueOfEarnOutLiability
Central Fairwinds [Member]    
Other Commitments [Line Items]    
Percentage of leased area 76.00%cio_PercentageOfLeasedAreaOccupiedBySpecifiedTenants
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= cio_CentralFairwindsMember
76.00%cio_PercentageOfLeasedAreaOccupiedBySpecifiedTenants
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= cio_CentralFairwindsMember
Stabilized capitalization rate   7.75%cio_CapitalizationRates
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= cio_CentralFairwindsMember
Earn-Out Payment, Description   The Company will make any additional Earn-Out Payment within 30 days of the end of the Earn-Out Term based on new qualified leases entered into since the achievement of the last Earn-Out Threshold.
Range 1 [Member] | Central Fairwinds [Member]    
Other Commitments [Line Items]    
Percentage of Earn-Out Threshold   70.00%cio_PercentageOfEarnOutThreshold
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= cio_CentralFairwindsMember
/ us-gaap_RangeAxis
= cio_Range1Member
Range 2 [Member] | Central Fairwinds [Member]    
Other Commitments [Line Items]    
Percentage of Earn-Out Threshold   80.00%cio_PercentageOfEarnOutThreshold
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= cio_CentralFairwindsMember
/ us-gaap_RangeAxis
= cio_Range2Member
Range 3 [Member] | Central Fairwinds [Member]    
Other Commitments [Line Items]    
Percentage of Earn-Out Threshold   90.00%cio_PercentageOfEarnOutThreshold
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= cio_CentralFairwindsMember
/ us-gaap_RangeAxis
= cio_Range3Member