Mack-Cali Realty, L.P.'s Partners' Capital (Repurchase Of General Partner Units And Dividend Reinvestment And Stock Purchase Plan) (Narrative) (Details) - USD ($)	1 Months Ended	3 Months Ended
	Sep. 30, 2012	Mar. 31, 2016
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]
Capacity of share repurchase program		$ 150,000,000
Shares purchased and retired	394,625
Aggregate cost of stock repurchased	$ 11,000,000
Capacity available for additional repurchase of outstanding common stock		$ 139,000,000
Common units purchased from the Company	394,625
Cost of units purchased from the company	$ 11,000,000
Share repurchase program initiation date		September 2012
Dividend Reinvestment And Stock Purchase Plan [Member]
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]
Common stock reserved for future issuance		5,500,000
Monthly cash investment without restriction, maximum		$ 5,000