2.4.0.840421 - Disclosure - Investments In Unconsolidated Joint Ventures (Roseland/North Retail, L.L.C.) (Narrative) (Details)truefalsefalse1false USDfalsefalse$Duration_4_1_2013_To_6_30_2013_dei_LegalEntityAxis_cli_PortImperialNorthRetailLLCMemberhttp://www.sec.gov/CIK0000924901duration2013-04-01T00:00:002013-06-30T00:00:00Unit1Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$2false USDfalsefalse$Duration_1_1_2013_To_6_30_2013_dei_LegalEntityAxis_cli_PortImperialNorthRetailLLCMemberhttp://www.sec.gov/CIK0000924901duration2013-01-01T00:00:002013-06-30T00:00:00Unit16Standardhttp://www.xbrl.org/2003/instancepurexbrli0Unit1Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$3false falsefalseAs_Of_10_23_2012_dei_LegalEntityAxis_cli_PortImperialNorthRetailLLCMemberhttp://www.sec.gov/CIK0000924901instant2012-10-23T00:00:000001-01-01T00:00:00Unit16Standardhttp://www.xbrl.org/2003/instancepurexbrli01false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse1false USDtruefalse$Duration_4_1_2013_To_6_30_2013_dei_LegalEntityAxis_cli_PortImperialNorthRetailLLCMemberhttp://www.sec.gov/CIK0000924901duration2013-04-01T00:00:002013-06-30T00:00:00falsefalsePort Imperial North Retail, L.L.C. 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[Member]2true 3us-gaap_ScheduleOfEquityMethodInvestmentsLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Schedule of Equity Method Investments [Line Items]3false 4cli_ResidualOwnershipInterestcli_falsenainstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3truetruefalse0.200.20falsefalsefalsenum:percentItemTypepureResidual Ownership InterestNo definition available.false0Residual ownership interest4false 4cli_PercentageOfOperatingReturnOnCapitalcli_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2truetruefalse0.090.09falsefalsefalse3falsefalsefalse00falsefalsefalsenum:percentItemTypepurePercentage Of Operating Return On CapitalNo definition available.false0Percentage of operating return on capital5false 4cli_ManagementLeasingAndOtherServicesFeescli_falsecreditdurationfalsefalsefalsefalsefalsefalsefalsefalse1truefalsefalse70007000USD$falsetruefalse2truefalsefalse1500015000USD$falsetruefalse3falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryManagement Leasing And Other Services Fees.No definition available.false2Management, leasing and other services fees6false 4cli_HoldingAndDistributionPatternUnderOperatingAgreementcli_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00In general, the operating agreement of PI North Retail provides that operating cash flows are distributed first to Prudential-PI and then to the Company based on a nine percent operating return on each members' capital balance in priorities as detailed in the operating agreement. Excess operating cash flows are distributed to the members in accordance with ownership percentages.falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringHolding And Distribution Pattern Under Operating AgreementNo definition available.false0Holding and distribution pattern under operating agreement7false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4false USDtruefalse$As_Of_6_30_2013_dei_LegalEntityAxis_cli_PRIIPortImperialRetailLLCMember_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_cli_RoselandNorthRetailLLCMemberhttp://www.sec.gov/CIK0000924901instant2013-06-30T00:00:000001-01-01T00:00:00falsefalseRoseland/North Retail, L.L.C. [Member]us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxisxbrldihttp://xbrl.org/2006/xbrldicli_RoselandNorthRetailLLCMemberus-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxisexplicitMemberfalsefalsePR II Port Imperial Retail, L.L.C. [Member]dei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicli_PRIIPortImperialRetailLLCMemberdei_LegalEntityAxisexplicitMemberUnit1Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Roseland/North Retail, L.L.C. [Member] | PR II Port Imperial Retail, L.L.C. [Member]8true 3us-gaap_ScheduleOfEquityMethodInvestmentsLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Schedule of Equity Method Investments [Line Items]9false 4us-gaap_PartnersCapitalus-gaap_truecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse43000004300000USD$falsefalsefalse2truefalsefalse43000004300000USD$falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryThe amount of ownership interest of different classes of partners in limited partnership.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70434-108055 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 87-21 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. 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[Member]us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxisxbrldihttp://xbrl.org/2006/xbrldicli_RoselandNorthRetailLLCMemberus-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxisexplicitMemberfalsefalseParent Company [Member]dei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_ParentCompanyMemberdei_LegalEntityAxisexplicitMemberUnit1Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Roseland/North Retail, L.L.C. [Member] | Parent Company [Member]12true 3us-gaap_ScheduleOfEquityMethodInvestmentsLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Schedule of Equity Method Investments [Line Items]13false 4us-gaap_PartnersCapitalus-gaap_truecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse00USD$falsetruefalse2truefalsefalse00USD$falsetruefalse3falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryThe amount of ownership interest of different classes of partners in limited partnership.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70434-108055 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 87-21 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Practice Bulletin (PB) -Number 14 -Paragraph 15 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. 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(Narrative) (Details) (USD $)NoRoundingUnKnownUnKnownUnKnowntruefalsefalseSheethttp://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVenturesRoselandNorthRetailLLCNarrativeDetails316