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Derivative Financial Instruments - Derivative Financial Instruments (Detail) - Derivatives Designated as Hedges [Member] - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Derivatives Fair Value [Line Items]    
Asset derivatives fair value $ 7,840 $ 1,883
Liability derivatives fair value 10,410 30,667
Accounts receivable-other [Member]    
Derivatives Fair Value [Line Items]    
Asset derivatives fair value 7,686 1,668
Accounts payable [Member]    
Derivatives Fair Value [Line Items]    
Liability derivatives fair value 8,330 26,649
Other assets [Member]    
Derivatives Fair Value [Line Items]    
Asset derivatives fair value 154 215
Other liabilities [Member]    
Derivatives Fair Value [Line Items]    
Liability derivatives fair value $ 2,080 $ 4,018