Registration Rights Agreements - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended									1 Months Ended
	Aug. 31, 2011	May 26, 2011	Nov. 30, 2010	Nov. 17, 2010	Nov. 17, 2010 General Partner	Nov. 30, 2007 Affiliated Entity	Aug. 01, 2011 Piggy-back registration rights	Nov. 17, 2010 Piggy-back registration rights	May 27, 2009 Piggy-back registration rights	Nov. 30, 2010 Piggy-back registration rights Annual Grant
Limited Partners' Capital Account [Line Items]
Senior secured credit facility						$ 30
Common units							12,724,019	197,628	400,000
Piggy-back registration rights, date of grant										2010-11
Percentage of sale of interest in the General partner to Central Energy, LP			100.00%		100.00%
Newly issued Common Units sold to Central Energy, LP				12,724,019
Common Units distributed to limited partners of Central Energy, LP		12,469,535
Requirement to keep registration statement effective once filed	2 years