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Financial Instruments - Schedule of Offsetting Asset and Liability Derivatives in the Condensed Consolidated Balance Sheets (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Asset Derivatives:    
Gross amount of recognized assets $ 4,706 $ 4,209
Gross amounts offset in the balance sheet (1,190) (2,862)
Net amount 3,516 1,347
Liability Derivatives:    
Gross amount of recognized liabilities (2,070) (4,287)
Gross amounts offset in the balance sheet 1,190 2,862
Net amount (880) (1,425)
Total derivative instruments $ 2,636 $ (78)