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Summary of Gain or Loss Recognized and Amounts and Location of Income or Expense and Gain or Loss Reclassified into Income for Interest Rate Contracts and Foreign Currency Contracts (Detail) (Interest rate agreements, Interest Expense, USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Interest rate agreements | Interest Expense |  |  |  |
Derivative [Line Items] |  |  |  |
Interest rate agreements | $ 1,847 | $ 1,898 | $ 5,587 | $ 5,743

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