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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 | Mar. 31, 2013 | Dec. 31, 2012
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Statement Of Financial Position [Abstract] |  |
Total segment assets | $ 221,710 | $ 216,699
Cash and cash equivalents and investments | 608,499 | 627,399
Other current assets | 38,593 | 36,242
Property, plant and equipment, net | 79,709 | 80,516
Goodwill and intangible assets, net | 164,090 | 162,294
Other assets | 12,807 | 11,692
Total assets | $ 1,125,408 | $ 1,134,842

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