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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
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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)

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