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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
Sep. 30, 2013
Dec. 31, 2012
Asset Derivatives:    
Gross amount of recognized assets $ 2,342 $ 4,209
Gross amounts offset in the balance sheet (956) (2,862)
Net amount 1,386 1,347
Liability Derivatives:    
Gross amount of recognized liabilities (3,925) (4,287)
Gross amounts offset in the balance sheet 956 2,862
Net amount (2,969) (1,425)
Total derivative instruments $ (1,583) $ (78)