Organization - Additional Information (Detail) (USD $)	1 Months Ended	6 Months Ended
	Nov. 30, 2010	Jun. 30, 2012 Entity	Dec. 31, 2011	Nov. 17, 2010	Jul. 31, 2007 gal
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Penn Octane and affiliate interest sold to Central Energy LP	100.00%
Common Units as percentage of Central's outstanding partnership interests		98.00%
Common Units as percentage of Central's limited partnership interests		100.00%
Partnership interest represented by General Partner interest		2.00%
Newly issued Common Units sold to Central Energy, LP				12,724,019
Newly issued Common Units sold to Central Energy, LP and Penn Octane, value		$ 195,000	$ 903,000	$ 3,950,000
Penn Octane's interest sold to Central Energy Partners LP, value	150,000
Available storage capacity of Regional Enterprises, Inc.					10,400,000
Number of subsidiaries		2
Limited Partner
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Penn Octane and affiliate interest sold to Central Energy LP		99.90%
General Partner
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Penn Octane and affiliate interest sold to Central Energy LP				100.00%
Penn Octane's interest sold to Central Energy Partners LP, value	$ 150,000
Rio Vista Operating Partnership L.P.
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Percentage of ownership interest of Penn Octane		75.00%
Central Energy GP LLC
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Percentage of ownership interest of Penn Octane		100.00%