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Commitments And Contingencies (Roseland Transaction Modifications) (Narrative) (Details) (USD $)
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3 Months Ended |
0 Months Ended |
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Mar. 31, 2015
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Mar. 31, 2014
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Oct. 28, 2014
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Oct. 23, 2015
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Apr. 24, 2015
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Dec. 31, 2014
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| Commitments And Contingencies [Line Items] |
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| Severance benefits |
$ 23,800,000us-gaap_SeveranceCosts1
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$ 11,000,000us-gaap_SeveranceCosts1
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| Earn out paid |
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3,936,000cli_BusinessAcquisitionContingentConsiderationCashPaid
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| Accounts payable, accrued expenses and other liabilities |
134,462,000us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent
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126,971,000us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent
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| Minimum [Member] |
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| Commitments And Contingencies [Line Items] |
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| Percentage of interest in venture |
7.50%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
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| Roseland Partners, L.L.C. [Member] |
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| Commitments And Contingencies [Line Items] |
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| Business acquisition, contingent cash payment |
900,000us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh
/ us-gaap_BusinessAcquisitionAxis
= cli_RoselandPartnersLLCMember
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| Accounts payable, accrued expenses and other liabilities |
1,000,000us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= cli_RoselandPartnersLLCMember
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1,000,000us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= cli_RoselandPartnersLLCMember
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| Roseland Partners, L.L.C. [Member] | Messr Goldberg [Member] |
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| Commitments And Contingencies [Line Items] |
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| Consulting period |
1 year
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| Roseland Partners, L.L.C. [Member] | Messr Klatt And Messr Goldberg [Member] |
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| Commitments And Contingencies [Line Items] |
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| Period for continuation of health insurance |
1 year
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| Severance benefits |
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750,000us-gaap_SeveranceCosts1
/ us-gaap_BusinessAcquisitionAxis
= cli_RoselandPartnersLLCMember
/ us-gaap_TitleOfIndividualAxis
= cli_MessieurKlattAndMessieurGoldbergMember
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| Roseland Partners, L.L.C. [Member] | Messr Tycher [Member] | Minimum [Member] |
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| Commitments And Contingencies [Line Items] |
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| Percentage of interest in venture |
50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_BusinessAcquisitionAxis
= cli_RoselandPartnersLLCMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_TitleOfIndividualAxis
= cli_MessieurTycherMember
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| Roseland Partners, L.L.C. [Member] | Scenario, Forecast [Member] | Messr Goldberg [Member] |
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| Commitments And Contingencies [Line Items] |
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| Consulting payment |
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400,000us-gaap_ProfessionalFees
/ us-gaap_BusinessAcquisitionAxis
= cli_RoselandPartnersLLCMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
/ us-gaap_TitleOfIndividualAxis
= cli_MessieurGoldbergMember
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| Roseland Partners, L.L.C. [Member] | Scenario, Forecast [Member] | Messr Klatt And Messr Goldberg [Member] |
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| Commitments And Contingencies [Line Items] |
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| Severance benefits |
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500,000us-gaap_SeveranceCosts1
/ us-gaap_BusinessAcquisitionAxis
= cli_RoselandPartnersLLCMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
/ us-gaap_TitleOfIndividualAxis
= cli_MessieurKlattAndMessieurGoldbergMember
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| Roseland Partners, L.L.C. [Member] | Obtaining Of Tax Credits/Grants [Member] |
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| Commitments And Contingencies [Line Items] |
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| Business acquisition, contingent cash payment |
3,000,000us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh
/ us-gaap_BusinessAcquisitionAxis
= cli_RoselandPartnersLLCMember
/ us-gaap_ContingentConsiderationByTypeAxis
= cli_ObtainingOfTaxCreditsGrantsMember
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| Roseland Partners, L.L.C. [Member] | Obtaining Of Tax Credits/Grants [Member] | Scenario, Forecast [Member] |
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| Commitments And Contingencies [Line Items] |
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| Earn out paid |
$ 1,000,000cli_BusinessAcquisitionContingentConsiderationCashPaid
/ us-gaap_BusinessAcquisitionAxis
= cli_RoselandPartnersLLCMember
/ us-gaap_ContingentConsiderationByTypeAxis
= cli_ObtainingOfTaxCreditsGrantsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
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