General - Condensed Schedule of Investments (Detail) (USD $)	Jun. 30, 2013	Dec. 31, 2012
Schedule of Investments [Line Items]
Investment in Master, at fair value	$ 109,551,060	$ 145,802,728
Percentage of Members Capital	7.42%	11.09%
Futures and Exchange-Cleared Swap Contracts Purchased [Member]
Schedule of Investments [Line Items]
Investment in Master, at fair value	(63,559,287)	(7,554,487)
Percentage of Members Capital	(9.22%)	(0.90%)
Futures and Exchange-Cleared Swap Contracts Purchased [Member] | Energy [Member]
Schedule of Investments [Line Items]
Number of Contracts	21,335	28,941
Investment in Master, at fair value	(63,559,287)	(7,554,487)
Percentage of Members Capital	(9.22%)	(0.90%)
Futures and Exchange-Cleared Swap Contracts Sold [Member]
Schedule of Investments [Line Items]
Investment in Master, at fair value	50,382,940	(22,166,740)
Percentage of Members Capital	7.31%	(2.63%)
Futures and Exchange-Cleared Swap Contracts Sold [Member] | Energy [Member]
Schedule of Investments [Line Items]
Number of Contracts	23,408	23,309
Investment in Master, at fair value	50,382,940	(22,166,740)
Percentage of Members Capital	7.31%	(2.63%)
Options Purchased [Member]
Schedule of Investments [Line Items]
Investment in Master, at fair value	97,288,719	160,438,693
Percentage of Members Capital	14.12%	19.04%
Options Purchased [Member] | Call Option Energy NYMEX LT Crude Oil [Member] | Call [Member]
Schedule of Investments [Line Items]
Number of Contracts		10,246
Investment in Master, at fair value		85,675,570
Percentage of Members Capital		10.17%
Options Purchased [Member] | Other [Member] | Call [Member]
Schedule of Investments [Line Items]
Number of Contracts		3,838
Investment in Master, at fair value		2,271,899
Percentage of Members Capital		0.27%
Options Purchased [Member] | Other [Member] | Put [Member]
Schedule of Investments [Line Items]
Number of Contracts	6,543	2,549
Investment in Master, at fair value	27,210,920	22,237,564
Percentage of Members Capital	3.95%	2.64%
Options Purchased [Member] | Call options purchased [Member] | Call [Member]
Schedule of Investments [Line Items]
Investment in Master, at fair value	34,677,359	87,947,469
Percentage of Members Capital	5.03%	10.44%
Options Purchased [Member] | Put Option Energy NYMEX LT Crude Oil [Member] | Put [Member]
Schedule of Investments [Line Items]
Number of Contracts	8,314	8,080
Investment in Master, at fair value	35,400,440	50,253,660
Percentage of Members Capital	5.14%	5.96%
Options Purchased [Member] | Put options purchased [Member] | Put [Member]
Schedule of Investments [Line Items]
Investment in Master, at fair value	62,611,360	72,491,224
Percentage of Members Capital	9.09%	8.60%
Options Purchased [Member] | Energy [Member] | Call [Member]
Schedule of Investments [Line Items]
Number of Contracts	14,369
Investment in Master, at fair value	34,677,359
Percentage of Members Capital	5.03%
Options Premium Received [Member]
Schedule of Investments [Line Items]
Investment in Master, at fair value	(32,987,494)	(37,237,413)
Percentage of Members Capital	(4.79%)	(4.42%)
Options Premium Received [Member] | Call options premium received [Member] | Call [Member]
Schedule of Investments [Line Items]
Investment in Master, at fair value	(11,611,202)	(28,666,392)
Percentage of Members Capital	(1.69%)	(3.40%)
Options Premium Received [Member] | Put options premium received [Member] | Put [Member]
Schedule of Investments [Line Items]
Investment in Master, at fair value	(21,376,292)	(8,571,021)
Percentage of Members Capital	(3.10%)	(1.02%)
Options Premium Received [Member] | Energy [Member] | Call options premium received [Member] | Call [Member]
Schedule of Investments [Line Items]
Number of Contracts	15,677	11,030
Investment in Master, at fair value	(11,611,202)	(28,666,392)
Percentage of Members Capital	(1.69%)	(3.40%)
Options Premium Received [Member] | Energy [Member] | Put options premium received [Member] | Put [Member]
Schedule of Investments [Line Items]
Number of Contracts	9,515	6,042
Investment in Master, at fair value	$ (21,376,292)	$ (8,571,021)
Percentage of Members Capital	(3.10%)	(1.02%)