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Balance Sheet Offsetting (Derivative Assets And Derivative Liabilities) (Detail) (USD $)
Sep. 30, 2013
Dec. 31, 2012
Offsetting Of Financial Assets [Member]
    
Derivative [Line Items]    
Derivative Financial Assets, Net Amounts Presented In The Consolidated Balance Sheet $ 22,936,000 $ 25,915,000
Derivative Financial Assets, Financial Instruments 0 0
Derivative Financial Assets, Cash Collateral (2,720,000) 0
Derivative Financial Assets, Net Amount 20,216,000 25,915,000
Offsetting Of Financial Liabilities [Member]
    
Derivative [Line Items]    
Derivative Financial Liabilities, Net Amounts Presented In The Consolidated Balance Sheet 54,712,000 72,126,000
Derivative Financial Liabilities, Financial Instruments 0 0
Derivative Financial Liabilities, Cash Collateral (44,828,000) (75,103,000)
Derivative Financial Liabilities, Net Amount 9,884,000 (2,977,000)
FCM A [Member] | Offsetting Of Financial Assets [Member]
    
Derivative [Line Items]    
Derivative Financial Assets, Net Amounts Presented In The Consolidated Balance Sheet 0  
Derivative Financial Assets, Financial Instruments 0  
Derivative Financial Assets, Cash Collateral 0  
Derivative Financial Assets, Net Amount 0  
FCM A [Member] | Offsetting Of Financial Liabilities [Member]
    
Derivative [Line Items]    
Derivative Financial Liabilities, Net Amounts Presented In The Consolidated Balance Sheet 298,000  
Derivative Financial Liabilities, Financial Instruments 0  
Derivative Financial Liabilities, Cash Collateral (571,000)  
Derivative Financial Liabilities, Net Amount (273,000)  
FCM B [Member] | Offsetting Of Financial Assets [Member]
    
Derivative [Line Items]    
Derivative Financial Assets, Net Amounts Presented In The Consolidated Balance Sheet 0  
Derivative Financial Assets, Financial Instruments 0  
Derivative Financial Assets, Cash Collateral 0  
Derivative Financial Assets, Net Amount 0  
FCM B [Member] | Offsetting Of Financial Liabilities [Member]
    
Derivative [Line Items]    
Derivative Financial Liabilities, Net Amounts Presented In The Consolidated Balance Sheet 256,000  
Derivative Financial Liabilities, Financial Instruments 0  
Derivative Financial Liabilities, Cash Collateral (517,000)  
Derivative Financial Liabilities, Net Amount (261,000)  
Futures Commission Merchant Agreements Counterparty [Member] | Offsetting Of Financial Assets [Member]
    
Derivative [Line Items]    
Derivative Financial Assets, Net Amounts Presented In The Consolidated Balance Sheet 0  
Derivative Financial Assets, Financial Instruments 0  
Derivative Financial Assets, Cash Collateral 0  
Derivative Financial Assets, Net Amount 0  
Futures Commission Merchant Agreements Counterparty [Member] | Offsetting Of Financial Liabilities [Member]
    
Derivative [Line Items]    
Derivative Financial Liabilities, Net Amounts Presented In The Consolidated Balance Sheet 554,000  
Derivative Financial Liabilities, Financial Instruments 0  
Derivative Financial Liabilities, Cash Collateral (1,088,000)  
Derivative Financial Liabilities, Net Amount (534,000)  
Dealer A [Member] | Offsetting Of Financial Assets [Member]
    
Derivative [Line Items]    
Derivative Financial Assets, Net Amounts Presented In The Consolidated Balance Sheet 1,687,000 0
Derivative Financial Assets, Financial Instruments 0 0
Derivative Financial Assets, Cash Collateral 0 0
Derivative Financial Assets, Net Amount 1,687,000 0
Dealer A [Member] | Offsetting Of Financial Liabilities [Member]
    
Derivative [Line Items]    
Derivative Financial Liabilities, Net Amounts Presented In The Consolidated Balance Sheet 4,683,000 7,789,000
Derivative Financial Liabilities, Financial Instruments 0 0
Derivative Financial Liabilities, Cash Collateral (3,110,000) (7,820,000)
Derivative Financial Liabilities, Net Amount 1,573,000 (31,000)
Dealer B [Member] | Offsetting Of Financial Assets [Member]
    
Derivative [Line Items]    
Derivative Financial Assets, Net Amounts Presented In The Consolidated Balance Sheet 2,087,000 873,000
Derivative Financial Assets, Financial Instruments 0 0
Derivative Financial Assets, Cash Collateral 0 0
Derivative Financial Assets, Net Amount 2,087,000 873,000
Dealer B [Member] | Offsetting Of Financial Liabilities [Member]
    
Derivative [Line Items]    
Derivative Financial Liabilities, Net Amounts Presented In The Consolidated Balance Sheet 3,911,000 6,104,000
Derivative Financial Liabilities, Financial Instruments 0 0
Derivative Financial Liabilities, Cash Collateral (1,750,000) (5,050,000)
Derivative Financial Liabilities, Net Amount 2,161,000 1,054,000
Dealer C [Member] | Offsetting Of Financial Assets [Member]
    
Derivative [Line Items]    
Derivative Financial Assets, Net Amounts Presented In The Consolidated Balance Sheet 217,000 5,000
Derivative Financial Assets, Financial Instruments 0 0
Derivative Financial Assets, Cash Collateral 0 0
Derivative Financial Assets, Net Amount 217,000 5,000
Dealer C [Member] | Offsetting Of Financial Liabilities [Member]
    
Derivative [Line Items]    
Derivative Financial Liabilities, Net Amounts Presented In The Consolidated Balance Sheet 1,246,000 3,460,000
Derivative Financial Liabilities, Financial Instruments 0 0
Derivative Financial Liabilities, Cash Collateral (900,000) (3,300,000)
Derivative Financial Liabilities, Net Amount 346,000 160,000
Dealer D [Member] | Offsetting Of Financial Assets [Member]
    
Derivative [Line Items]    
Derivative Financial Assets, Net Amounts Presented In The Consolidated Balance Sheet 3,989,000 0
Derivative Financial Assets, Financial Instruments 0 0
Derivative Financial Assets, Cash Collateral (2,720,000) 0
Derivative Financial Assets, Net Amount 1,269,000 0
Dealer D [Member] | Offsetting Of Financial Liabilities [Member]
    
Derivative [Line Items]    
Derivative Financial Liabilities, Net Amounts Presented In The Consolidated Balance Sheet 1,127,000 3,239,000
Derivative Financial Liabilities, Financial Instruments 0 0
Derivative Financial Liabilities, Cash Collateral 0 (3,350,000)
Derivative Financial Liabilities, Net Amount 1,127,000 (111,000)
Dealer E [Member] | Offsetting Of Financial Assets [Member]
    
Derivative [Line Items]    
Derivative Financial Assets, Net Amounts Presented In The Consolidated Balance Sheet 0 0
Derivative Financial Assets, Financial Instruments 0 0
Derivative Financial Assets, Cash Collateral 0 0
Derivative Financial Assets, Net Amount 0 0
Dealer E [Member] | Offsetting Of Financial Liabilities [Member]
    
Derivative [Line Items]    
Derivative Financial Liabilities, Net Amounts Presented In The Consolidated Balance Sheet 24,078,000 33,598,000
Derivative Financial Liabilities, Financial Instruments 0 0
Derivative Financial Liabilities, Cash Collateral (25,600,000) (35,800,000)
Derivative Financial Liabilities, Net Amount (1,522,000) (2,202,000)
Dealer F [Member] | Offsetting Of Financial Assets [Member]
    
Derivative [Line Items]    
Derivative Financial Assets, Net Amounts Presented In The Consolidated Balance Sheet 0 0
Derivative Financial Assets, Financial Instruments 0 0
Derivative Financial Assets, Cash Collateral 0 0
Derivative Financial Assets, Net Amount 0 0
Dealer F [Member] | Offsetting Of Financial Liabilities [Member]
    
Derivative [Line Items]    
Derivative Financial Liabilities, Net Amounts Presented In The Consolidated Balance Sheet 6,066,000 9,105,000
Derivative Financial Liabilities, Financial Instruments 0 0
Derivative Financial Liabilities, Cash Collateral (6,900,000) (10,300,000)
Derivative Financial Liabilities, Net Amount (834,000) (1,195,000)
Dealer G [Member] | Offsetting Of Financial Assets [Member]
    
Derivative [Line Items]    
Derivative Financial Assets, Net Amounts Presented In The Consolidated Balance Sheet 0 0
Derivative Financial Assets, Financial Instruments 0 0
Derivative Financial Assets, Cash Collateral 0 0
Derivative Financial Assets, Net Amount 0 0
Dealer G [Member] | Offsetting Of Financial Liabilities [Member]
    
Derivative [Line Items]    
Derivative Financial Liabilities, Net Amounts Presented In The Consolidated Balance Sheet 4,581,000 6,623,000
Derivative Financial Liabilities, Financial Instruments 0 0
Derivative Financial Liabilities, Cash Collateral (4,620,000) (7,150,000)
Derivative Financial Liabilities, Net Amount (39,000) (527,000)
Dealer H [Member] | Offsetting Of Financial Assets [Member]
    
Derivative [Line Items]    
Derivative Financial Assets, Net Amounts Presented In The Consolidated Balance Sheet 0 0
Derivative Financial Assets, Financial Instruments 0 0
Derivative Financial Assets, Cash Collateral 0 0
Derivative Financial Assets, Net Amount 0 0
Dealer H [Member] | Offsetting Of Financial Liabilities [Member]
    
Derivative [Line Items]    
Derivative Financial Liabilities, Net Amounts Presented In The Consolidated Balance Sheet 987,000 1,816,000
Derivative Financial Liabilities, Financial Instruments 0 0
Derivative Financial Liabilities, Cash Collateral (860,000) (1,820,000)
Derivative Financial Liabilities, Net Amount 127,000 (4,000)
End User [Member] | Offsetting Of Financial Assets [Member]
    
Derivative [Line Items]    
Derivative Financial Assets, Net Amounts Presented In The Consolidated Balance Sheet 14,956,000 25,037,000
Derivative Financial Assets, Financial Instruments 0 0
Derivative Financial Assets, Cash Collateral 0 0
Derivative Financial Assets, Net Amount 14,956,000 25,037,000
End User [Member] | Offsetting Of Financial Liabilities [Member]
    
Derivative [Line Items]    
Derivative Financial Liabilities, Net Amounts Presented In The Consolidated Balance Sheet 7,479,000 392,000
Derivative Financial Liabilities, Financial Instruments 0 0
Derivative Financial Liabilities, Cash Collateral 0 (513,000)
Derivative Financial Liabilities, Net Amount 7,479,000 (121,000)
Bilateral Agreements Counterparty [Member] | Offsetting Of Financial Assets [Member]
    
Derivative [Line Items]    
Derivative Financial Assets, Net Amounts Presented In The Consolidated Balance Sheet 22,936,000  
Derivative Financial Assets, Financial Instruments 0  
Derivative Financial Assets, Cash Collateral (2,720,000)  
Derivative Financial Assets, Net Amount 20,216,000  
Bilateral Agreements Counterparty [Member] | Offsetting Of Financial Liabilities [Member]
    
Derivative [Line Items]    
Derivative Financial Liabilities, Net Amounts Presented In The Consolidated Balance Sheet 54,158,000  
Derivative Financial Liabilities, Financial Instruments 0  
Derivative Financial Liabilities, Cash Collateral (43,740,000)  
Derivative Financial Liabilities, Net Amount 10,418,000  
Counterparty [Member] | Offsetting Of Financial Assets [Member]
    
Derivative [Line Items]    
Derivative Financial Assets, Net Amounts Presented In The Consolidated Balance Sheet 22,936,000 25,915,000
Derivative Financial Assets, Financial Instruments 0 0
Derivative Financial Assets, Cash Collateral (2,720,000) 0
Derivative Financial Assets, Net Amount 20,216,000 25,915,000
Counterparty [Member] | Offsetting Of Financial Liabilities [Member]
    
Derivative [Line Items]    
Derivative Financial Liabilities, Net Amounts Presented In The Consolidated Balance Sheet 54,712,000 72,126,000
Derivative Financial Liabilities, Financial Instruments 0 0
Derivative Financial Liabilities, Cash Collateral (44,828,000) (75,103,000)
Derivative Financial Liabilities, Net Amount $ 9,884,000 $ (2,977,000)