Annual report pursuant to Section 13 and 15(d)

Investments In Unconsolidated Joint Ventures (Summary Of Financial Position Of Unconsolidated Joint Ventures) (Details)

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Investments In Unconsolidated Joint Ventures (Summary Of Financial Position Of Unconsolidated Joint Ventures) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Investments In Unconsolidated Joint Ventures [Abstract]    
Rental property, net $ 1,534,812cli_EquityMethodInvestmentSummarizedFinancialInformationRentalPropertyNet $ 755,038cli_EquityMethodInvestmentSummarizedFinancialInformationRentalPropertyNet
Loan receivable   45,050cli_EquityMethodInvestmentSummarizedFinancialInformationLoansReceivable
Other assets 398,173cli_EquityMethodInvestmentSummarizedFinancialInformationOtherAssets 582,989cli_EquityMethodInvestmentSummarizedFinancialInformationOtherAssets
Total assets 1,932,985us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets 1,383,077us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets
Mortgages and loans payable 1,060,020cli_EquityMethodInvestmentSummarizedFinancialInformationSecuredDebt 637,709cli_EquityMethodInvestmentSummarizedFinancialInformationSecuredDebt
Other liabilities 211,340cli_EquityMethodInvestmentSummarizedFinancialInformationOtherLiabilities 87,231cli_EquityMethodInvestmentSummarizedFinancialInformationOtherLiabilities
Partners'/members' capital 661,625us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquityOrCapital 658,137us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquityOrCapital
Total liabilities and partners'/members' capital $ 1,932,985us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilitiesAndEquity $ 1,383,077us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilitiesAndEquity