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Acquisition - Summary of Pro Forma Financial Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
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Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Pro forma |  |  |  |
Net sales | $ 456,648 | $ 439,042 | $ 1,344,623 | $ 1,298,629
Net income | $ 34,273 | $ 24,243 | $ 63,709 | $ 67,244
Diluted earnings per share | $ 0.77 | $ 0.56 | $ 1.44 | $ 1.54

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- Definition The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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