Quarterly report pursuant to Section 13 or 15(d)

Deferred Charges, Goodwill and Other Assets (Summary Of Notional Amount And Fair Value Of Derivative Financial Instruments) (Details)

v2.4.1.9
Deferred Charges, Goodwill and Other Assets (Summary Of Notional Amount And Fair Value Of Derivative Financial Instruments) (Details) (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Derivatives, Fair Value [Line Items]      
Fair Value $ 32,000us-gaap_DerivativeFairValueOfDerivativeNet   $ 95,000us-gaap_DerivativeFairValueOfDerivativeNet
Interest and other investment income (loss) 267,000us-gaap_InvestmentIncomeInterestAndDividend 386,000us-gaap_InvestmentIncomeInterestAndDividend  
Gain (Loss) on Derivative Instruments [Member]      
Derivatives, Fair Value [Line Items]      
Interest and other investment income (loss) (63,000)us-gaap_InvestmentIncomeInterestAndDividend
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GainLossOnDerivativeInstrumentsMember 		   
LIBOR Cap One [Member]      
Derivatives, Fair Value [Line Items]      
Notional Value 51,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= cli_LiborCapOneMember 		[1]    
Strike Rate 1.50%us-gaap_DerivativeCapInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= cli_LiborCapOneMember 		   
Effective Date Sep. 01, 2014    
Expiration Date Oct. 01, 2015    
Fair Value 1,000us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= cli_LiborCapOneMember 		  1,000us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= cli_LiborCapOneMember
LIBOR Cap Two [Member]      
Derivatives, Fair Value [Line Items]      
Notional Value 24,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= cli_LiborCapTwoMember 		[1]    
Strike Rate 1.50%us-gaap_DerivativeCapInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= cli_LiborCapTwoMember 		   
Effective Date Sep. 01, 2014    
Expiration Date Oct. 01, 2015    
Fair Value 1,000us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= cli_LiborCapTwoMember 		  1,000us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= cli_LiborCapTwoMember
LIBOR Cap Three [Member]      
Derivatives, Fair Value [Line Items]      
Notional Value 51,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= cli_LiborCapThreeMember 		[1]    
Strike Rate 1.75%us-gaap_DerivativeCapInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= cli_LiborCapThreeMember 		   
Effective Date Oct. 01, 2015    
Expiration Date Oct. 01, 2016    
Fair Value 20,000us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= cli_LiborCapThreeMember 		  64,000us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= cli_LiborCapThreeMember
LIBOR Cap Four [Member]      
Derivatives, Fair Value [Line Items]      
Notional Value 24,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= cli_LiborCapFourMember 		[1]    
Strike Rate 1.75%us-gaap_DerivativeCapInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= cli_LiborCapFourMember 		   
Effective Date Oct. 01, 2015    
Expiration Date Oct. 01, 2016    
Fair Value $ 10,000us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= cli_LiborCapFourMember 		  $ 29,000us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= cli_LiborCapFourMember
[1] The notional value is an indication of the extent of our involvement in these instruments at that time, but does not represent exposure to credit, interest rate or market risks.