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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