Label	Element	Value
Mack Cali Realty Lp [Member]
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest	us-gaap_NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest	$ 1,697,181,000
Mack Cali Realty Lp [Member] | Limited Partners Common Unitholders [Member]
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest	us-gaap_NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest	232,764,000
Mack Cali Realty Lp [Member] | General Partner Common Unitholders [Member]
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest	us-gaap_NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest	1,413,497,000
Mack Cali Realty Lp [Member] | Other Ownership Interest [Member]
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest	us-gaap_NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest	42,150,000
Accumulated Other Comprehensive Income [Member] | Mack Cali Realty Lp [Member]
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest	us-gaap_NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest	$ 8,770,000