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Acquisitions - Information of Company's Results of Operations (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Business Acquisition, Pro Forma Information [Abstract] |  |  |
Net sales | $ 335,101 us-gaap_BusinessAcquisitionsProFormaRevenue | $ 337,767 us-gaap_BusinessAcquisitionsProFormaRevenue | $ 281,345 us-gaap_BusinessAcquisitionsProFormaRevenue
Net income | $ 16,619 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss | $ 15,958 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss | $ 12,933 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
Earnings per share: |  |  |
Basic | $ 0.64 us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic | $ 0.67 us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic | $ 0.55 us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic
Diluted | $ 0.62 us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted | $ 0.61 us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted | $ 0.51 us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted

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- Definition The pro forma basic 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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- 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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- Definition The pro forma net Income or Loss for the 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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- Definition The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the 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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