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Basis of Presentation - Reconciliation of Segment Assets to Consolidated Total Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Dec. 31, 2011
Segment Reporting Information [Line Items]      
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
As Previously Reported [Member]
      
Segment Reporting Information [Line Items]      
Total segment assets   216,699 274,526
Cash and cash equivalents and investments   627,399 573,392
Other current assets   36,242 44,856
Property, plant and equipment, net   80,516 72,487
Goodwill and intangible assets, net   162,294 141,127
Other assets   11,692 12,266
Total assets   1,134,842 1,118,654
Adjustment [Member]
      
Segment Reporting Information [Line Items]      
Other assets   17,720 15,281
Total assets   $ 17,720 $ 15,281