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Other Liabilities - Schedule of Other Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Dec. 31, 2011
Other Current Liabilities:      
Product warranties $ 6,732 $ 8,266  
Deferred revenue 4,599 9,280  
Other 24,568 19,859  
Total other current liabilities 35,899 37,405  
Other Liabilities:      
Long-term income tax payable 44,309 38,600 31,365
Accrued compensation 21,078 18,750 15,174
Other 5,004 3,745 953
Total other liabilities $ 70,391 $ 61,095 $ 47,492