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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
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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

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