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Other Intangible Assets Textuals (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization expense related to finite-lived intangible assets | $ 18.9 | $ 20.1 | $ 14.0
Customer relationships [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted average period (in years) | 12 years 3 months 18 days |  |
Proprietary technology [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted average period (in years) | 13 years 2 months 12 days |  |
Patents and Other [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted average period (in years) | 11 years 3 months 18 days |  |
Axtone Railway Components Acquisition [Member] | Customer relationships [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted average period (in years) | 12 years |  |
Finite-lived Intangible Assets Acquired | $ 7.6 |  |
Axtone Railway Components Acquisition [Member] | Trademarks [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted average period (in years) | 10 years |  |
Finite-lived Intangible Assets Acquired | $ 2.3 |  |
Industrial Process |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) |  | $ 4.1 |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + 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 Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275 + Details
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