Quarterly report pursuant to Section 13 or 15(d)

Real Estate Transactions (Summary Of Income From Properties Sold) (Details)

v2.4.1.9
Real Estate Transactions (Summary Of Income From Properties Sold) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Real Estate Properties [Line Items]    
Total revenues $ 153,715us-gaap_RealEstateRevenueNet $ 169,596us-gaap_RealEstateRevenueNet
Depreciation and amortization (40,802)us-gaap_DepreciationAndAmortization (44,985)us-gaap_DepreciationAndAmortization
Income from properties sold 27,008us-gaap_OperatingIncomeLoss 13,167us-gaap_OperatingIncomeLoss
Realized gains (losses) on sales, net 144us-gaap_GainLossOnDispositionOfAssets  
Income (loss) from properties sold (2,521)us-gaap_NetIncomeLoss (15,298)us-gaap_NetIncomeLoss
Disposal Group Disposed Of By Means Other Than Sale Not Discontinued Operations [Member]    
Real Estate Properties [Line Items]    
Total revenues 8us-gaap_RealEstateRevenueNet
/ cli_DisposalGroupClassificationAxis
= cli_DisposalGroupDisposedOfByMeansOtherThanSaleNotDiscontinuedOperationsMember
14,969us-gaap_RealEstateRevenueNet
/ cli_DisposalGroupClassificationAxis
= cli_DisposalGroupDisposedOfByMeansOtherThanSaleNotDiscontinuedOperationsMember
Operating and other expenses (3)us-gaap_OperatingExpenses
/ cli_DisposalGroupClassificationAxis
= cli_DisposalGroupDisposedOfByMeansOtherThanSaleNotDiscontinuedOperationsMember
(9,253)us-gaap_OperatingExpenses
/ cli_DisposalGroupClassificationAxis
= cli_DisposalGroupDisposedOfByMeansOtherThanSaleNotDiscontinuedOperationsMember
Depreciation and amortization (2)us-gaap_DepreciationAndAmortization
/ cli_DisposalGroupClassificationAxis
= cli_DisposalGroupDisposedOfByMeansOtherThanSaleNotDiscontinuedOperationsMember
(3,394)us-gaap_DepreciationAndAmortization
/ cli_DisposalGroupClassificationAxis
= cli_DisposalGroupDisposedOfByMeansOtherThanSaleNotDiscontinuedOperationsMember
Income from properties sold 3us-gaap_OperatingIncomeLoss
/ cli_DisposalGroupClassificationAxis
= cli_DisposalGroupDisposedOfByMeansOtherThanSaleNotDiscontinuedOperationsMember
2,322us-gaap_OperatingIncomeLoss
/ cli_DisposalGroupClassificationAxis
= cli_DisposalGroupDisposedOfByMeansOtherThanSaleNotDiscontinuedOperationsMember
Realized gains (losses) on sales, net 144us-gaap_GainLossOnDispositionOfAssets
/ cli_DisposalGroupClassificationAxis
= cli_DisposalGroupDisposedOfByMeansOtherThanSaleNotDiscontinuedOperationsMember
 
Income (loss) from properties sold $ 147us-gaap_NetIncomeLoss
/ cli_DisposalGroupClassificationAxis
= cli_DisposalGroupDisposedOfByMeansOtherThanSaleNotDiscontinuedOperationsMember
$ 2,322us-gaap_NetIncomeLoss
/ cli_DisposalGroupClassificationAxis
= cli_DisposalGroupDisposedOfByMeansOtherThanSaleNotDiscontinuedOperationsMember