Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Measurement of Assets and Liabilities at Fair Value on Recurring Basis (Detail)

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Fair Value Measurements - Measurement of Assets and Liabilities at Fair Value on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities $ 4,245 $ 3,754
Interest rate swap (418) (1,205)
Foreign exchange forward contract (1,475)  
Metal commodity swaps (11)  
Fair Value, Inputs, Level 1 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities 4,245 3,754
Interest rate swap      
Foreign exchange forward contract     
Metal commodity swaps     
Fair Value, Inputs, Level 2 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities      
Interest rate swap (418) (1,205)
Foreign exchange forward contract (1,475)  
Metal commodity swaps (11)  
Fair Value, Inputs, Level 3 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities      
Interest rate swap      
Foreign exchange forward contract     
Metal commodity swaps