Annual report pursuant to Section 13 and 15(d)

Reconciliation of Gross Assets and Liabilities and Netting Agreements on Fair Value of Open Derivative Contracts (Detail)

v2.4.0.8
Reconciliation of Gross Assets and Liabilities and Netting Agreements on Fair Value of Open Derivative Contracts (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Derivative Assets  
Fair value of commodity derivative contracts $ 141
Amounts not offset in the balance sheet (141)
Net amounts   
Derivative Liabilities  
Fair value of commodity derivative contracts 9,423
Amounts not offset in the balance sheet (141)
Net amounts $ 9,282