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Acquisitions - Summary of Supplemental Pro Forma Information (Detail) - Professional Power Products, Inc. [Member] - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |  |
Net sales | $ 93,972 | $ 292,776 | $ 249,265
Net income | $ 7,148 | $ 12,574 | $ 12,792
Earnings per share, basic | $ 0.66 | $ 1.16 | $ 1.20
Earnings per share, diluted | $ 0.56 | $ 0.41 | $ 1.04

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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=56956515&loc=d3e1392-128463 + Details
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