Real Estate Transactions (Narrative) (Details) (USD $)
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3 Months Ended | 12 Months Ended | 0 Months Ended | |
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Mar. 31, 2015
property
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Mar. 31, 2014
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Dec. 31, 2014
property
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Apr. 01, 2015
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Real Estate Properties [Line Items] | ||||
Purchase price of property | $ 19,658,000us-gaap_PaymentsToAcquireAndDevelopRealEstate | $ 14,600,000us-gaap_PaymentsToAcquireAndDevelopRealEstate | ||
Realized gains (losses) on disposition of rental property, net | 144,000us-gaap_GainLossOnDispositionOfAssets | |||
Number of properties sold | 1cli_NumberOfPropertiesSold | 16cli_NumberOfPropertiesSold | ||
City Square Project [Member] | Subsequent Event [Member] | ||||
Real Estate Properties [Line Items] | ||||
Number of units |
370us-gaap_NumberOfUnitsInRealEstateProperty / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = cli_CitySquareProjectMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
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Purchase price of property |
3,100,000us-gaap_PaymentsToAcquireAndDevelopRealEstate / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = cli_CitySquareProjectMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
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Contingent consideration |
1,250,000us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = cli_CitySquareProjectMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
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Minimum project start period | 12 months | |||
Total project costs |
88,000,000cli_EstimatedCostOfProject / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = cli_CitySquareProjectMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
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1451 Metropolitan Drive [Member] | ||||
Real Estate Properties [Line Items] | ||||
Area of property (in square feet) |
21,600us-gaap_AreaOfRealEstateProperty / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = cli_OneThousandFourHundredFiftyOneMetropolitanDriveMember |
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Sales proceeds |
$ 1,100,000us-gaap_ProceedsFromSaleOfRealEstateHeldforinvestment / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = cli_OneThousandFourHundredFiftyOneMetropolitanDriveMember |
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Construction Project, Minimum Start Period No definition available.
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Estimated Cost Of Project No definition available.
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Number Of Properties Sold No definition available.
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Area of a real estate property. No definition available.
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Amount of liability recognized arising from contingent consideration in a business combination. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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The number of units in a real estate property owned as of the balance sheet date. No definition available.
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The cash outflow from the acquisition of a piece of land and anything permanently fixed to it, including buildings, structures on it and so forth, and payments to develop real estate assets by adding improvements on or to a parcel of land. Such improvements may include drainage, utilities, subdividing, access, buildings, and any combination of these elements. Including real estate intended to generate income for the owner; excluding real estate acquired for use by the owner. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Cash received from the sale of real estate that is held for investment, that is, it is part of an investing activity during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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