Consolidated Statements Of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Net income (loss)	$ 13,521	$ (37,844)
Other comprehensive income (loss):
Net unrealized gain (loss) on derivative instruments for interest rate swaps		(16)
Comprehensive income (loss)	13,521	(37,860)
Comprehensive (income) loss attributable to noncontrolling interests in consolidated joint ventures	1,335	176
Comprehensive (income) loss attributable to redeemable noncontrolling interests	(6,471)	(6,471)
Comprehensive (income) loss attributable to noncontrolling interests in Operating Partnership	762	4,249
Comprehensive income (loss) attributable to common shareholders	9,147	(39,906)
Mack-Cali Realty LP [Member]
Net income (loss)	13,521	(37,844)
Other comprehensive income (loss):
Net unrealized gain (loss) on derivative instruments for interest rate swaps		(16)
Comprehensive income (loss)	13,521	(37,860)
Comprehensive (income) loss attributable to noncontrolling interests in consolidated joint ventures	1,335	176
Comprehensive (income) loss attributable to redeemable noncontrolling interests	(6,471)	(6,471)
Comprehensive income (loss) attributable to common shareholders	$ 8,385	$ (44,155)