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Other Assets - Schedule of Other Assets (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | --- | ---
Other Current Assets: |  |  |
Income tax receivable | $ 10,684 | $ 12,768 |
Other | 17,967 | 15,280 |
Total other current assets | 28,651 | 28,048 |
Other Assets: |  |  |
Deferred tax assets, net | 9,828 | 9,497 | 10,274
Long-term income tax receivable | 19,411 | 17,720 | 15,281
Other | 1,959 | 2,195 | 1,992
Total other assets | $ 31,198 | $ 29,412 | $ 27,547

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