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Business Segment, Geographic Area, Product and Significant Customer Information - Reconciliation of Segment Assets to Consolidated Total Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Dec. 31, 2011
Statement Of Financial Position [Abstract]      
Total segment assets $ 234,193 $ 216,699 $ 274,526
Cash and cash equivalents and investments 625,837 627,399 573,392
Other current assets 38,710 36,242 44,856
Property, plant and equipment, net 78,020 80,516 72,487
Goodwill and intangible assets, net 164,016 162,294 141,127
Other assets 31,198 29,412 27,547
Total assets $ 1,171,974 $ 1,152,562 $ 1,133,935