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Basis of Presentation - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 6 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
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Jun. 30, 2013 | Jul. 01, 2012 | Mar. 31, 2013 Reclassifications | Jul. 01, 2012 Reclassifications | Sep. 30, 2012 Reclassifications | Dec. 31, 2012 Reclassifications | Dec. 31, 2011 Reclassifications
Organization and Summary of Significant Accounting Policies Disclosure [Line Items] |  |  |  |  |  |  |
Contingent consideration payments | $ 9,487 | $ 6,930 | $ 7,200 | $ 6,900 | $ 6,900 | $ 17,600 | $ 5,900

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