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Consolidated Statements of Capital (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended		9 Months Ended	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2019	Dec. 31, 2018	Jan. 01, 2018
Increase (Decrease) in Partner's Capital
Acquisition of subsidiary interest from noncontrolling interest	$ (54)		$ (25,791)
DRSPP proceeds	39	$ 52	263	$ 64
Conversion of common units	25	0	446	1,560
Reallocation of noncontrolling interests in the operating partnership	(1,481)	11,941	(14,028)	(4,493)
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings	5,948	4,634	10,533	8,090
Repurchases of common stock	(74,531)	(25,236)	(109,313)	(693,091)
Contribution to consolidated joint venture interests	2,404	3,072	50,692	1,828
Deconsolidation of partially owned entity		(520)		(314,596)
Cash distributions to noncontrolling interests	$ (207)	$ (1,139)	$ (271)	$ (724)
Common Stock
Increase (Decrease) in Partner's Capital
DRSPP proceeds (in shares)	0	0	3	1
Conversion of common units
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings (in shares)	21	13	(17)	(20)
Repurchases of common stock (in shares)	(916)	(253)	(1,265)	(7,133)
Repurchases of common stock	$ (9)	$ (2)	$ (12)	$ (72)
Contributions - proceeds from stock options exercised (in shares)		109		59
Noncontrolling Interests
Increase (Decrease) in Partner's Capital
Acquisition of subsidiary interest from noncontrolling interest	0		(25,276)
Contribution to consolidated joint venture interests	2,404	$ 3,072	50,692	$ 1,828
Deconsolidation of partially owned entity		(520)		(314,596)
Cash distributions to noncontrolling interests	(207)	(1,139)	(271)	(724)
SL Green Operating Partnership
Increase (Decrease) in Partner's Capital
Beginning Balance	5,879,501	6,242,056	5,947,855	6,589,454	$ 5,947,855	$ 6,589,454
Adjusted Balance				7,159,978		7,159,978
Net income	36,271	91,811	210,470	213,168
Acquisition of subsidiary interest from noncontrolling interest	(54)		(25,791)		(16,388)	(60,718)
Other comprehensive loss	(11,737)	3,677	(43,503)	14,018
Preferred distributions	(3,738)	(3,738)	(7,475)	(7,475)
DRSPP proceeds	39	52	263	64
Conversion of common units	25	0	446	1,560
Reallocation of noncontrolling interests in the operating partnership	(1,481)	11,941	(14,028)	(4,493)
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings	5,948	4,634	10,533	8,090
Repurchases of common stock	(74,531)	(25,236)	(109,313)	(693,091)
Contribution to consolidated joint venture interests	2,404	3,072	50,692	1,828
Deconsolidation of partially owned entity		(520)		(314,596)
Contributions - proceeds from stock options exercised		9,936		5,637
Cash distributions to noncontrolling interests	(207)	(1,139)	(271)	(724)
Cash distributions declared (per common unit, none of which represented a return of capital for federal income tax purposes)	(69,140)	(69,371)	(140,377)	(141,908)
Ending Balance	5,763,300	6,267,175	5,879,501	6,242,056	5,763,300	5,947,855
SL Green Operating Partnership \| Common Stock \| Partners' Interest
Increase (Decrease) in Partner's Capital
Beginning Balance	$ 5,616,385	$ 5,936,262	$ 5,664,481	$ 5,984,557	$ 5,664,481	$ 5,984,557
Beginning Balance (units)	82,410	85,725	83,684	92,803	83,684	92,803
Adjusted Balance				$ 6,555,081		$ 6,555,081
Net income	$ 36,895	$ 91,947	$ 212,370	212,797
Acquisition of subsidiary interest from noncontrolling interest	(54)		(515)
Preferred distributions	$ (3,738)	$ (3,738)	$ (7,475)	$ (7,475)
DRSPP proceeds (in shares)	0	0	3	1
DRSPP proceeds	$ 39	$ 52	$ 263	$ 64
Conversion of common units (in shares)	0	0	5	15
Conversion of common units	$ 25	$ 0	$ 446	$ 1,560
Reallocation of noncontrolling interests in the operating partnership	$ (1,481)	$ 11,941	$ (14,028)	$ (4,493)
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings (in shares)	21	13	(17)	(20)
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings	$ 5,948	$ 4,634	$ 10,533	$ 8,090
Repurchases of common stock (in shares)	(916)	(253)	(1,265)	(7,133)
Repurchases of common stock	$ (74,531)	$ (25,236)	$ (109,313)	$ (693,091)
Contributions - proceeds from stock options exercised (in shares)		109		59
Contributions - proceeds from stock options exercised		$ 9,936		$ 5,637
Cash distributions declared (per common unit, none of which represented a return of capital for federal income tax purposes)	(69,140)	(69,371)	(140,377)	(141,908)
Ending Balance	$ 5,510,348	$ 5,956,427	$ 5,616,385	$ 5,936,262	$ 5,510,348	$ 5,664,481
Ending Balance (units)	81,515	85,594	82,410	85,725	81,515	83,684
SL Green Operating Partnership \| Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Partner's Capital
Beginning Balance	$ (28,395)	$ 32,622	$ 15,108	$ 18,604	$ 15,108	$ 18,604
Adjusted Balance				18,604		18,604
Other comprehensive loss	(11,737)	3,677	(43,503)	14,018
Ending Balance	(40,132)	36,299	(28,395)	32,622	(40,132)	15,108
SL Green Operating Partnership \| Noncontrolling Interests
Increase (Decrease) in Partner's Capital
Beginning Balance	69,579	51,240	46,334	364,361	46,334	364,361
Adjusted Balance				364,361		364,361
Net income	(624)	(136)	(1,900)	371
Acquisition of subsidiary interest from noncontrolling interest	0		(25,276)
Contribution to consolidated joint venture interests	2,404	3,072	50,692	1,828
Deconsolidation of partially owned entity		(520)		(314,596)
Cash distributions to noncontrolling interests	(207)	(1,139)	(271)	(724)
Ending Balance	71,152	52,517	69,579	51,240	71,152	46,334
Series I Preferred Stock \| SL Green Operating Partnership \| Preferred Units
Increase (Decrease) in Partner's Capital
Beginning Balance	221,932	221,932	221,932	221,932	221,932	221,932
Adjusted Balance				221,932		221,932
Ending Balance	$ 221,932	$ 221,932	$ 221,932	$ 221,932	$ 221,932	$ 221,932
Accounting Standards Update 2014-09
Increase (Decrease) in Partner's Capital
Cumulative adjustment upon adoption of ASC 610-20							$ 570,524
Accounting Standards Update 2014-09 \| SL Green Operating Partnership
Increase (Decrease) in Partner's Capital
Cumulative adjustment upon adoption of ASC 610-20							570,524
Accounting Standards Update 2014-09 \| SL Green Operating Partnership \| Common Stock \| Partners' Interest
Increase (Decrease) in Partner's Capital
Cumulative adjustment upon adoption of ASC 610-20							$ 570,524