Consolidated Statement of Capital (Parenthetical) (USD $)	3 Months Ended
Mar. 31, 2013
Consolidated Statement of Capital
Cash distribution declared, per common unit	$ 0.33
Return of capital, per common unit	$ 0.00

Total distributions per unit to each class of partners (i.e., general, limited and preferred partners).

No definition available.

Name:	slgop_PartnersCapitalAccountDistributionsPerUnitDeclared
Namespace Prefix:	slgop_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration