Condensed Schedule of Investments	Sep. 30, 2020 USD ($) Contract	Dec. 31, 2019 USD ($) Contract
Futures Contracts [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation on Open Contracts	$ 596,593	$ 1,455,308
Unrealized Depreciation on Open Contracts	(689,696)	(805,108)
Net unrealized appreciation (depreciation) on open contracts	$ (93,103)	$ 650,200
% of Partners' Capital	(0.37%)	2.20%
Forward Contracts [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation on Open Contracts	$ 160,169	$ 227,718
Unrealized Depreciation on Open Contracts	(351,362)	(489,107)
Net unrealized appreciation (depreciation) on open contracts	$ (191,193)	$ (261,389)
% of Partners' Capital	(0.75%)	(0.88%)
Total Unrealized Depreciation on Open Contracts [Member] \| Forward Contracts [Member]
Schedule of Investments [Line Items]
% of Partners' Capital	(1.38%)	(1.65%)
Total Unrealized Appreciation on Open Contracts [Member] \| Forward Contracts [Member]
Schedule of Investments [Line Items]
% of Partners' Capital	0.63%	0.77%
Commodity [Member] \| Futures Contracts [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation on Open Contracts	$ 326,347	$ 563,455
Unrealized Depreciation on Open Contracts	(410,677)	(223,403)
Commodity [Member] \| Forward Contracts [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation on Open Contracts	131,978	123,549
Unrealized Depreciation on Open Contracts	$ (142,286)	$ (235,526)
Commodity [Member] \| Total Unrealized Depreciation on Open Contracts [Member] \| Forward Contracts [Member]
Schedule of Investments [Line Items]
Number of Contracts \| Contract	130	110
% of Partners' Capital	(0.56%)	(0.79%)
Commodity [Member] \| Total Unrealized Appreciation on Open Contracts [Member] \| Forward Contracts [Member]
Schedule of Investments [Line Items]
Number of Contracts \| Contract	90	96
% of Partners' Capital	0.52%	0.42%
Equity [Member] \| Futures Contracts [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation on Open Contracts	$ 131,943	$ 498,738
Unrealized Depreciation on Open Contracts	(57,141)	(133,469)
Currencies [Member] \| Futures Contracts [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation on Open Contracts	9,556	195,187
Unrealized Depreciation on Open Contracts	(74,772)	(59,373)
Currencies [Member] \| Forward Contracts [Member]
Schedule of Investments [Line Items]
Notional Amount	4,649,396	10,512,323
Unrealized Appreciation on Open Contracts	28,191	104,169
Notional Amount	23,757,467	26,025,906
Unrealized Depreciation on Open Contracts	$ (209,076)	$ (253,581)
Currencies [Member] \| Total Unrealized Depreciation on Open Contracts [Member] \| Forward Contracts [Member]
Schedule of Investments [Line Items]
% of Partners' Capital	(0.82%)	(0.86%)
Currencies [Member] \| Total Unrealized Appreciation on Open Contracts [Member] \| Forward Contracts [Member]
Schedule of Investments [Line Items]
% of Partners' Capital	0.11%	0.35%
Interest Rates [Member] \| Futures Contracts [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation on Open Contracts	$ 128,747	$ 197,928
Unrealized Depreciation on Open Contracts	(147,106)	(388,863)
Long [Member] \| Futures Contracts [Member]
Schedule of Investments [Line Items]
Net unrealized appreciation (depreciation) on open contracts	$ 232,257	$ 710,756
% of Partners' Capital	0.91%	2.40%
Long [Member] \| Commodity [Member] \| Futures Contracts [Member]
Schedule of Investments [Line Items]
Number of Contracts \| Contract	473	475
Net unrealized appreciation (depreciation) on open contracts	$ 154,834	$ 494,585
% of Partners' Capital	0.61%	1.67%
Long [Member] \| Equity [Member] \| Futures Contracts [Member]
Schedule of Investments [Line Items]
Number of Contracts \| Contract	100	415
Net unrealized appreciation (depreciation) on open contracts	$ 47,452	$ 402,901
% of Partners' Capital	0.19%	1.36%
Long [Member] \| Currencies [Member] \| Futures Contracts [Member]
Schedule of Investments [Line Items]
Number of Contracts \| Contract	70	356
Net unrealized appreciation (depreciation) on open contracts	$ (47,097)	$ 174,285
% of Partners' Capital	(0.19%)	0.59%
Long [Member] \| Interest Rates [Member] \| Futures Contracts [Member]
Schedule of Investments [Line Items]
Number of Contracts \| Contract	1,488	373
Net unrealized appreciation (depreciation) on open contracts	$ 77,068	$ (361,015)
% of Partners' Capital	0.30%	(1.22%)
Short [Member] \| Futures Contracts [Member]
Schedule of Investments [Line Items]
Net unrealized appreciation (depreciation) on open contracts	$ (325,360)	$ (60,556)
% of Partners' Capital	(1.28%)	(0.20%)
Short [Member] \| Commodity [Member] \| Futures Contracts [Member]
Schedule of Investments [Line Items]
Number of Contracts \| Contract	216	219
Net unrealized appreciation (depreciation) on open contracts	$ (239,164)	$ (154,533)
% of Partners' Capital	(0.94%)	(0.52%)
Short [Member] \| Equity [Member] \| Futures Contracts [Member]
Schedule of Investments [Line Items]
Number of Contracts \| Contract	49	44
Net unrealized appreciation (depreciation) on open contracts	$ 27,350	$ (37,632)
% of Partners' Capital	0.11%	(0.13%)
Short [Member] \| Currencies [Member] \| Futures Contracts [Member]
Schedule of Investments [Line Items]
Number of Contracts \| Contract	44	83
Net unrealized appreciation (depreciation) on open contracts	$ (18,119)	$ (38,471)
% of Partners' Capital	(0.07%)	(0.13%)
Short [Member] \| Interest Rates [Member] \| Futures Contracts [Member]
Schedule of Investments [Line Items]
Number of Contracts \| Contract	443	728
Net unrealized appreciation (depreciation) on open contracts	$ (95,427)	$ 170,080
% of Partners' Capital	(0.38%)	0.58%

MORGAN STANLEY SMITH BARNEY SPECTRUM SELECT LP 10-Q