Fair Value Measurement - Derivative Instruments, Fair Value Based on Hierarchy (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
Derivative [Line Items]
Total assets	$ 4,229,742	$ 5,006,715
Total liabilities	3,228,872	3,414,717
Net Fair value	1,000,870	1,591,998
Futures Contracts [Member]
Derivative [Line Items]
Total assets	2,589,857	3,697,165
Total liabilities	2,773,050	1,791,721
Forward Contracts [Member]
Derivative [Line Items]
Total assets	1,639,885	1,309,550
Total liabilities	455,822	1,622,996
Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1) [Member]
Derivative [Line Items]
Total assets	2,711,634	3,778,292
Total liabilities	3,006,189	2,313,710
Net Fair value	(294,555)	1,464,582
Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1) [Member] \| Futures Contracts [Member]
Derivative [Line Items]
Total assets	2,589,857	3,697,165
Total liabilities	2,773,050	1,791,721
Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1) [Member] \| Forward Contracts [Member]
Derivative [Line Items]
Total assets	121,777	81,127
Total liabilities	233,139	521,989
Significant Other Observable Inputs (Level 2) [Member]
Derivative [Line Items]
Total assets	1,518,108	1,228,423
Total liabilities	222,683	1,101,007
Net Fair value	1,295,425	127,416
Significant Other Observable Inputs (Level 2) [Member] \| Futures Contracts [Member]
Derivative [Line Items]
Total assets
Total liabilities
Significant Other Observable Inputs (Level 2) [Member] \| Forward Contracts [Member]
Derivative [Line Items]
Total assets	1,518,108	1,228,423
Total liabilities	222,683	1,101,007
Significant Unobservable Inputs (Level 3) [Member]
Derivative [Line Items]
Total assets
Total liabilities
Net Fair value
Significant Unobservable Inputs (Level 3) [Member] \| Futures Contracts [Member]
Derivative [Line Items]
Total assets
Total liabilities
Significant Unobservable Inputs (Level 3) [Member] \| Forward Contracts [Member]
Derivative [Line Items]
Total assets
Total liabilities

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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FAIRFIELD FUTURES FUND LP II 10-Q