Annual report pursuant to Section 13 and 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 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Derivatives, Fair Value [Line Items]                      
Fair Value $ 95,000us-gaap_DerivativeFairValueOfDerivativeNet               $ 95,000us-gaap_DerivativeFairValueOfDerivativeNet    
Interest and other investment income (loss) 1,399,000us-gaap_InvestmentIncomeInterestAndDividend 908,000us-gaap_InvestmentIncomeInterestAndDividend 922,000us-gaap_InvestmentIncomeInterestAndDividend 386,000us-gaap_InvestmentIncomeInterestAndDividend 1,616,000us-gaap_InvestmentIncomeInterestAndDividend 187,000us-gaap_InvestmentIncomeInterestAndDividend 1,094,000us-gaap_InvestmentIncomeInterestAndDividend 6,000us-gaap_InvestmentIncomeInterestAndDividend 3,615,000us-gaap_InvestmentIncomeInterestAndDividend 2,903,000us-gaap_InvestmentIncomeInterestAndDividend 34,000us-gaap_InvestmentIncomeInterestAndDividend
Gain (Loss) on Derivative Instruments [Member]                      
Derivatives, Fair Value [Line Items]                      
Interest and other investment income (loss)                 (79,000)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]               51,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= cli_LiborCapOneMember 		[1]    
Strike Rate 1.50%us-gaap_DerivativeCapInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= cli_LiborCapOneMember 		              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]               24,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= cli_LiborCapTwoMember 		[1]    
Strike Rate 1.50%us-gaap_DerivativeCapInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= cli_LiborCapTwoMember 		              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]               51,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= cli_LiborCapThreeMember 		[1]    
Strike Rate 1.75%us-gaap_DerivativeCapInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= cli_LiborCapThreeMember 		              1.75%us-gaap_DerivativeCapInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= cli_LiborCapThreeMember 		   
Effective Date                 Oct. 01, 2015    
Expiration Date                 Oct. 01, 2016    
Fair Value 64,000us-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]               24,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= cli_LiborCapFourMember 		[1]    
Strike Rate 1.75%us-gaap_DerivativeCapInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= cli_LiborCapFourMember 		              1.75%us-gaap_DerivativeCapInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= cli_LiborCapFourMember 		   
Effective Date                 Oct. 01, 2015    
Expiration Date                 Oct. 01, 2016    
Fair Value $ 29,000us-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.