Represents the maximum percentage of concentration risk that is not individually disclosed.

No definition available.

Name:	slgop_ConcentrationRiskPercentageThreshold
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Data Type:	num:percentItemType
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Period Type:	instant

- Definition

Represents the number of collective bargaining arrangements.

+ References

No definition available.

+ Details

Name:	slgop_NumberOfCollectiveBargainingArrangements
Namespace Prefix:	slgop_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the number of investments that accounted for more than the disclosed percentage of the income earned on debt and preferred equity investments during the specified period.

+ References

No definition available.

+ Details

Name:	slgop_NumberOfInvestments
Namespace Prefix:	slgop_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the number of tenants to whom the facility is leased.

+ References

No definition available.

+ Details

Name:	slgop_NumberOfTenants
Namespace Prefix:	slgop_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_ConcentrationRiskLineItems
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Data Type:	xbrli:stringItemType
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Period Type:	duration

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 18

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 21

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13537-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13531-108611

+ Details

Name:	us-gaap_ConcentrationRiskPercentage1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
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Period Type:	duration

Significant Accounting Policies (Details 6)		12 Months Ended														12 Months Ended
Significant Accounting Policies (Details 6)	Dec. 31, 2012 item	Dec. 31, 2012 Annualized rent Customer concentration item	Dec. 31, 2012 Annualized rent 1515 Broadway Customer concentration	Dec. 31, 2011 Annualized rent 1515 Broadway Customer concentration	Dec. 31, 2012 Annualized rent 919 Third Avenue Customer concentration	Dec. 31, 2011 Annualized rent 919 Third Avenue Customer concentration	Dec. 31, 2010 Annualized rent 919 Third Avenue Customer concentration	Dec. 31, 2012 Annualized rent 1185 Avenue of the Americas Customer concentration	Dec. 31, 2011 Annualized rent 1185 Avenue of the Americas Customer concentration	Dec. 31, 2010 Annualized rent 1185 Avenue of the Americas Customer concentration	Dec. 31, 2012 Annualized rent One Madison Avenue Customer concentration	Dec. 31, 2011 Annualized rent One Madison Avenue Customer concentration	Dec. 31, 2010 Annualized rent One Madison Avenue Customer concentration	Dec. 31, 2010 Annualized rent 420 Lexington Avenue Customer concentration	Dec. 31, 2010 Annualized rent 485 Lexington Avenue Customer concentration	Dec. 31, 2012 Annualized rent Tenant one Customer concentration	Dec. 31, 2012 Annualized rent Tenant two Customer concentration	Dec. 31, 2012 Annualized rent Tenant three Customer concentration	Dec. 31, 2012 Revenue earned on debt and preferred equity investments Two debt and preferred equity investments Credit concentration item	Dec. 31, 2012 Revenue earned on debt and preferred equity investments Two debt and preferred equity investments Credit concentration Minimum	Dec. 31, 2012 Collective bargaining arrangements Workforce concentration	Dec. 31, 2012 Collective bargaining arrangements which expires in 2015 Workforce concentration
Concentrations of Credit Risk
Number of tenants		3
Maximum percentage of annualized rent from other than Three tenants		1.90%	10.00%	10.00%	8.00%	8.00%	10.00%	7.00%	7.00%	9.00%	6.00%	7.00%	7.00%	7.00%	6.00%
Number of investments																			2
Percentage of concentration																6.90%	6.40%	6.00%		10.00%	74.80%	77.20%
Number of collective bargaining agreements	3