Commitments and Contingencies - Additional Information (Detail) (USD $)	6 Months Ended	1 Months Ended	3 Months Ended	12 Months Ended			1 Months Ended						6 Months Ended			1 Months Ended		6 Months Ended	1 Months Ended		6 Months Ended		1 Months Ended
	Jun. 30, 2012 Pipeline Event	Apr. 30, 2007 Regional Enterprises, Inc.	Jun. 30, 2012 Regional Enterprises, Inc. Vehicle	Dec. 31, 2005 Regional Enterprises, Inc.	May 24, 2006 Regional Enterprises, Inc.	Oct. 07, 2005 Regional Enterprises, Inc.	Jan. 31, 2012 Regional Enterprises, Inc. Maintenance Agreements	Feb. 29, 2012 Regional Enterprises, Inc. Lease Agreements Vehicle	Feb. 17, 2012 Regional Enterprises, Inc. Lease Agreements	Feb. 29, 2012 Regional Enterprises, Inc. Lease Agreements The option after the first anniversary date of the Lease Agreement to terminate the lease arrangement with respect to the New Tractors leased Maximum Vehicle	Feb. 29, 2012 Regional Enterprises, Inc. Lease Agreements If Regional fails to remedy any non-performance under the agreement	Feb. 29, 2012 Regional Enterprises, Inc. Lease Agreements Termination by either party to any New Truck subject to the agreement on any annual anniversary of such tractor's in-service date	Jun. 30, 2012 Regional Enterprises, Inc. Asphalt Agreement Tank	Jun. 30, 2012 Regional Enterprises, Inc. Asphalt Agreement Minimum bbl	Jun. 30, 2012 Regional Enterprises, Inc. Asphalt Agreement Automatic Renewal	Mar. 31, 2012 Regional Enterprises, Inc. Asphalt Agreement Storage Tanks Leak Tank	Dec. 31, 2008 Regional Enterprises, Inc. Fuel Oil Agreement	Jun. 30, 2012 Regional Enterprises, Inc. Fuel Oil Agreement Tank	Dec. 31, 2008 Regional Enterprises, Inc. Fuel Oil Agreement May 2010 through April 2011 Tank	Dec. 31, 2008 Regional Enterprises, Inc. Fuel Oil Agreement May 2011 through April 2012 Tank	Jun. 30, 2012 Regional Enterprises, Inc. Fuel Oil Agreement Automatic Renewal	Jun. 30, 2012 Regional Enterprises, Inc. Fuel Oil Agreement Tractor Tankers Minimum Tank	Jan. 31, 2009 Regional Enterprises, Inc. Number Four Oil Agreement Tank	May 31, 2009 Regional Enterprises, Inc. Vacuum Gas Oil Terminal Agreement	Sep. 30, 2007 Regional Enterprises, Inc. Sodium Hydroxide Agreement Tank	Mar. 31, 2012 Regional Enterprises, Inc. Number Six Oil Agreement Tank	Mar. 31, 2012 Regional Enterprises, Inc. Number Six Oil Agreement Automatic Renewal
Commitments and Contingencies Disclosure [Line Items]
Total clean up costs				$ 380,000
Aggregate amount of settlement of legal proceedings				115,000
Amount of citation issued by the government seeking a fine					28,000	4,500
Employee compensation claim settled		11,000
Transactions associated with sale of LPG Assets to TransMontaigne	2
Number of pipelines sold to TransMontaigne	2
Demands for indemnification from TransMontaigne seeking reimbursement from RVOP for working capital adjustments and indemnification obligations	775,000
Amount charged to Holdback provided for in the Purchase and Sales Agreement	500,000
Limitation on amount of indemnification	1,000,000
Accrued reserve for potential future obligations	283,000
Upward price adjustment percentage							1.00%
Agreement term							36 months						5 years
Agreement termination, written notice period							60 days				5 days	120 days	120 days				6 months	365 days
Number of tractors leased			21					20
Amount of security deposit provided from the sale of tractors								90,000	90,000
Number of tractors sold								6
Lease agreement term								7 years
Number of tractors			5							5
Alternative payment amount, per month								738
Agreement term, renewal													5 years		1 year		2 years				1 year						1 year
Annual fee receivable													500,000
Net barrels of asphalt per contract year provided to customers														610,000
Number of storage tanks provided to customers													3			1		3	1	1		2	1		2	1
Insurance deductible													100,000
Asphalt Loss recorded													189,000
Annual tank rental revenue																	$ 308,000	$ 300,000					$ 330,000	$ 288,000	$ 314,172	$ 360,000
Percentage of gross income required under section 7704 of the Internal Revenue Code to be reported as qualifying income	90.00%
Corporate tax rate if Central were treated as a corporation	35.00%