Brokerage Fee Across Each Class of Units (Detail)	Jun. 30, 2012
Class A
Brokers and Dealers Disclosure [Line Items]
Brokerage fee	4.67%
Class A | Managing Owner | Managing Owner fee
Brokers and Dealers Disclosure [Line Items]
Brokerage fee	0.75%
Class A | Managing Owner | Underwriting expenses
Brokers and Dealers Disclosure [Line Items]
Brokerage fee	0.35%
Class A | Managing Owner | Clearing, NFA, and exchange fees (capped)
Brokers and Dealers Disclosure [Line Items]
Brokerage fee	1.57%
Class A | Selling Agent | Selling commission
Brokers and Dealers Disclosure [Line Items]
Brokerage fee	2.00%
Class B
Brokers and Dealers Disclosure [Line Items]
Brokerage fee	2.67%
Class B | Managing Owner | Managing Owner fee
Brokers and Dealers Disclosure [Line Items]
Brokerage fee	0.75%
Class B | Managing Owner | Underwriting expenses
Brokers and Dealers Disclosure [Line Items]
Brokerage fee	0.35%
Class B | Managing Owner | Clearing, NFA, and exchange fees (capped)
Brokers and Dealers Disclosure [Line Items]
Brokerage fee	1.57%
Class B | Selling Agent | Selling commission
Brokers and Dealers Disclosure [Line Items]
Brokerage fee	0.00%