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Acquisitions - Summary of Supplemental Pro Forma Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Professional Power Products, Inc. [Member] |  |  |
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |  |
Net sales |  | $ 353,175 | $ 278,117
Net (loss) income |  | $ 23,671 | $ (16,557)
(Loss) earnings per share, basic |  | $ 2.21 | $ (1.69)
(Loss) earnings per share, diluted |  | $ 1.57 | $ (1.69)
Powertrain Integration, LLC [Member] |  |  |
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |  |
Net sales | $ 402,718 | $ 400,585 |
Net (loss) income | $ 14,868 | $ 26,320 |
(Loss) earnings per share, basic | $ 1.38 | $ 2.46 |
(Loss) earnings per share, diluted | $ 0.50 | $ 1.81 |

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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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- 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=56956515&loc=d3e1392-128463 + Details
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