Quarterly report pursuant to Section 13 or 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
Mar. 31, 2015
Dec. 31, 2014
Investments In Unconsolidated Joint Ventures [Abstract]    
Rental property, net $ 1,546,589cli_EquityMethodInvestmentSummarizedFinancialInformationRentalPropertyNet $ 1,534,812cli_EquityMethodInvestmentSummarizedFinancialInformationRentalPropertyNet
Other assets 410,410cli_EquityMethodInvestmentSummarizedFinancialInformationOtherAssets 398,222cli_EquityMethodInvestmentSummarizedFinancialInformationOtherAssets
Total assets 1,956,999us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets 1,933,034us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets
Mortgages and loans payable 1,162,732cli_EquityMethodInvestmentSummarizedFinancialInformationSecuredDebt 1,060,020cli_EquityMethodInvestmentSummarizedFinancialInformationSecuredDebt
Other liabilities 214,572cli_EquityMethodInvestmentSummarizedFinancialInformationOtherLiabilities 211,340cli_EquityMethodInvestmentSummarizedFinancialInformationOtherLiabilities
Partners'/members' capital 579,695us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquityOrCapital 661,674us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquityOrCapital
Total liabilities and partners'/members' capital $ 1,956,999us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilitiesAndEquity $ 1,933,034us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilitiesAndEquity