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Consolidated Statement of Capital (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended	12 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Dec. 31, 2018	Jan. 01, 2018
Increase (Decrease) in Partner's Capital
Acquisition of subsidiary interest from noncontrolling interest	$ (25,791)	$ 0
DRSPP proceeds	216	47	$ 22	$ 42
Conversion of common units	0	446	1,560
Reallocation of noncontrolling interests in the operating partnership	14,904	(28,932)	(8,138)	3,645
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings	5,698	4,835	4,988	3,102
Repurchases of common stock	(75,070)	(34,243)	(338,347)	(354,744)
Contribution to consolidated joint venture interests	50,532	161	1,671	157
Deconsolidation of partially owned entity	0		0	(314,596)
Cash distributions to noncontrolling interests	$ (63)	$ (208)	$ (448)	$ (276)
Common Stock
Increase (Decrease) in Partner's Capital
DRSPP proceeds (in shares)	2	1	0	1
Conversion of common units
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings (in shares)	3	(20)	(1)	(19)
Repurchases of common stock (in shares)	(867)	(398)	(3,479)	(3,654)
Repurchases of common stock	$ (8)	$ (4)	$ (35)	$ (37)
Contributions - proceeds from stock options exercised (in shares)			55	4
Noncontrolling Interests
Increase (Decrease) in Partner's Capital
Acquisition of subsidiary interest from noncontrolling interest	(25,276)
Contribution to consolidated joint venture interests	50,532	161	$ 1,671	$ 157
Deconsolidation of partially owned entity			0	(314,596)
Cash distributions to noncontrolling interests	(63)	(208)	(448)	(276)
SL Green Operating Partnership
Increase (Decrease) in Partner's Capital
Beginning Balance	5,844,323	5,947,855	6,537,629	6,589,454	$ 5,947,855	$ 6,589,454
Adjusted Balance				7,159,978		7,159,978
Net income	162,702	47,767	107,466	105,702
Acquisition of subsidiary interest from noncontrolling interest	(25,791)	0			(16,297)	(60,718)
Other comprehensive income	(24,390)	(19,113)	4,049	9,969
Preferred distributions	(3,737)	(3,738)	(3,737)	(3,738)
DRSPP proceeds	216	47	22	42
Conversion of common units	0	446	1,560	0
Reallocation of noncontrolling interests in the operating partnership	14,904	(28,932)	(8,138)	3,645
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings	5,698	4,835	4,988	3,102
Repurchases of common stock	(75,070)	(34,243)	(338,347)	(354,744)
Contribution to consolidated joint venture interests	50,532	161	1,671	157
Deconsolidation of partially owned entity			0	(314,596)
Contributions - proceeds from stock options exercised			4,908	729
Cash distributions to noncontrolling interests	(63)	(208)	(448)	(276)
Cash distributions declared (per common unit, none of which represented a return of capital for federal income tax purposes)	(69,823)	(70,554)	(69,567)	(72,341)
Ending Balance	5,879,501	5,844,323	6,242,056	6,537,629	5,879,501	5,947,855
SL Green Operating Partnership \| Common Stock \| Partners' Interest
Increase (Decrease) in Partner's Capital
Beginning Balance	$ 5,579,872	$ 5,664,481	$ 6,237,280	$ 5,984,557	$ 5,664,481	$ 5,984,557
Beginning Balance (units)	83,272	83,684	89,135	92,803	83,684	92,803
Adjusted Balance				$ 6,555,081		$ 6,555,081
Net income	$ 164,840	$ 47,530	$ 107,293	105,504
Acquisition of subsidiary interest from noncontrolling interest	(515)
Preferred distributions	$ (3,737)	$ (3,738)	$ (3,737)	$ (3,738)
DRSPP proceeds (in shares)	2	1	0	1
DRSPP proceeds	$ 216	$ 47	$ 22	$ 42
Conversion of common units (in shares)		5	15	0
Conversion of common units		$ 446	$ 1,560	$ 0
Reallocation of noncontrolling interests in the operating partnership	$ 14,904	$ (28,932)	$ (8,138)	$ 3,645
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings (in shares)	3	(20)	(1)	(19)
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings	$ 5,698	$ 4,835	$ 4,988	$ 3,102
Repurchases of common stock (in shares)	(867)	(398)	(3,479)	(3,654)
Repurchases of common stock	$ (75,070)	$ (34,243)	$ (338,347)	$ (354,744)
Contributions - proceeds from stock options exercised (in shares)			55	4
Contributions - proceeds from stock options exercised			$ 4,908	$ 729
Cash distributions declared (per common unit, none of which represented a return of capital for federal income tax purposes)	(69,823)	(70,554)	(69,567)	(72,341)
Ending Balance	$ 5,616,385	$ 5,579,872	$ 5,936,262	$ 6,237,280	$ 5,616,385	$ 5,664,481
Ending Balance (units)	82,410	83,272	85,725	89,135	82,410	83,684
SL Green Operating Partnership \| Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Partner's Capital
Beginning Balance	$ (4,005)	$ 15,108	$ 28,573	$ 18,604	$ 15,108	$ 18,604
Adjusted Balance				18,604		18,604
Other comprehensive income	(24,390)	(19,113)	4,049	9,969
Ending Balance	(28,395)	(4,005)	32,622	28,573	(28,395)	15,108
SL Green Operating Partnership \| Noncontrolling Interests
Increase (Decrease) in Partner's Capital
Beginning Balance	46,524	46,334	49,844	364,361	46,334	364,361
Adjusted Balance				364,361		364,361
Net income	(2,138)	237	173	198
Acquisition of subsidiary interest from noncontrolling interest	(25,276)
Contribution to consolidated joint venture interests	50,532	161	1,671	157
Deconsolidation of partially owned entity				(314,596)
Cash distributions to noncontrolling interests	(63)	(208)	(448)	(276)
Ending Balance	69,579	46,524	51,240	49,844	69,579	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