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Acquisitions - Estimated Useful Lives of Identifiable Intangible Assets (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014
Backlog [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite lived intangible asset estimated life | 18 months | 18 months
Customer Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite lived intangible asset estimated life | 13 years | 13 years
Developed Technology [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite lived intangible asset estimated life | 7 years |
Powertrain Integration, LLC [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total identifiable intangible assets | $ 13,600 |
Powertrain Integration, LLC [Member] | Backlog [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total identifiable intangible assets | $ 600 |
Finite lived intangible asset estimated life | 3 months |
Powertrain Integration, LLC [Member] | Customer Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total identifiable intangible assets | $ 13,000 |
Finite lived intangible asset estimated life | 12 years |
Bi-Phase Technologies, LLC [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total identifiable intangible assets | $ 860 |
Bi-Phase Technologies, LLC [Member] | Customer Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total identifiable intangible assets | $ 160 |
Finite lived intangible asset estimated life | 15 years |
Bi-Phase Technologies, LLC [Member] | Developed Technology [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total identifiable intangible assets | $ 700 |
Finite lived intangible asset estimated life | 7 years |
Buck's Acquisition Company, LLC [Member] | Customer Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total identifiable intangible assets | $ 1,380 |
Finite lived intangible asset estimated life | 10 years |

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- Definition The amount of identifiable intangible assets recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472 + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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