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ACQUISITIONS - Narrative (Detail) $ in Thousands |  |  |  |  | 3 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  |  |
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Mar. 21, 2017 USD ($) | Mar. 06, 2017 USD ($) | Feb. 03, 2017 USD ($) | Nov. 30, 2016 USD ($) employee country | Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 04, 2017 USD ($) | Oct. 02, 2017 USD ($) | Apr. 05, 2017 USD ($) | Mar. 14, 2017 USD ($) | Mar. 13, 2017 USD ($) | Dec. 14, 2016 USD ($) | Nov. 30, 2016 € / shares | Nov. 17, 2016 USD ($) | Aug. 01, 2016 USD ($) | May 05, 2016 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash payment for acquisition |  |  |  |  |  | $ 982,445 | $ 904,695 | $ 135,231 |  |  |  |  |  |  |  |  |  |
Stock used for acquisition |  |  |  |  |  | 25,500 | 534,679 | 0 |  |  |  |  |  |  |  |  |  |
Cash acquired from acquisition |  |  |  |  |  | 35,408 | 186,903 | $ 5,681 |  |  |  |  |  |  |  |  |  |
Deposit in escrow |  |  |  |  |  | 0 | 744,748 |  |  |  |  |  |  |  |  |  |  |
Acquisition of Faiveley Transport noncontrolling interest |  |  |  |  |  |  | 760,599 |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | 2,460,103 | 2,078,765 |  |  |  |  |  |  |  |  |  |  |
Freight Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | 718,958 | 550,902 |  |  |  |  |  |  |  |  |  |  |
Transit Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | 1,741,145 | 1,527,863 |  |  |  |  |  |  |  |  |  |  |
Faiveley |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual sales of Faiveley |  |  |  | $ 1,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of employees (more than) | employee |  |  |  | 5,700 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of countries Faiveley operates in | country |  |  |  | 24 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price per share (in euros per share) | € / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 100 |  |  |
Percentage of share capital acquired (as a percent) |  |  |  | 51.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interests in Faiveley (as a percent) |  | 22.00% | 27.00% | 49.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common shares issued for conversion of one acquiree common share |  |  |  | 1.1538 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of additional share capital outstanding (as a percent) |  | 21.00% | 27.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash payment for acquisition | $ 17,500 | $ 303,200 | $ 411,800 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock used for acquisition |  | $ 300 | $ 25,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of share capital owned (as a percent) | 100.00% | 99.00% | 78.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total purchase price (as a percent) | 100.00% | 98.00% | 76.00% | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination, consideration transferred |  |  |  | $ 1,507,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deposit in escrow |  |  |  |  |  |  | $ 744,700 |  |  |  |  |  |  |  |  |  |  |
Acquisition of Faiveley Transport noncontrolling interest |  |  |  |  | $ 8,900 |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustment for change in value of current liabilities |  |  |  |  |  | 65,300 |  |  |  |  |  |  |  |  |  |  |  |
Adjustment for changes in receivables |  |  |  | 439,631 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustment for changes in liabilities |  |  |  | 819,493 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustment to other noncurrent assets |  |  |  |  |  | 30,000 |  |  |  |  |  |  |  |  |  |  |  |
Goodwill adjustment |  |  |  |  |  | 74,100 |  |  |  |  |  |  |  |  |  |  |  |
Accrued compensation assumed within other liabilities |  |  |  | 25,900 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | 1,262,350 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Faiveley | Fair Value of Receivables | Restatement Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustment for changes in receivables |  |  |  |  |  | 2,800 |  |  |  |  |  |  |  |  |  |  |  |
Faiveley | Fair Value of Current Liabilities | Restatement Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustment for changes in liabilities |  |  |  |  |  | 36,200 |  |  |  |  |  |  |  |  |  |  |  |
Faiveley | Fair Value of Assets Acquired and Liabilities Assumed | Restatement Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustment for changes in receivables |  |  |  |  |  | 64,300 |  |  |  |  |  |  |  |  |  |  |  |
Adjustment for changes in liabilities |  |  |  |  |  | 64,300 |  |  |  |  |  |  |  |  |  |  |  |
Faiveley | Customer Relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustment for change in value of customer relationships |  |  |  |  |  | 21,800 |  |  |  |  |  |  |  |  |  |  |  |
Faiveley | Freight Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | 72,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Faiveley | Transit Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | $ 1,190,400 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Faiveley | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of business acquisition consideration payable in cash (as a percent) |  |  |  | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Faiveley | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of business acquisition consideration payable in cash (as a percent) |  |  |  | 45.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Melett |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  | $ 22,501 |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  |  |  | 73,956 |  |  |  |  |  |  |  |  |
Goodwill expected to be deductible for taxes |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |
Acquired intangible assets |  |  |  |  |  |  |  |  | $ 39,259 |  |  |  |  |  |  |  |  |
TTC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  | $ 16,309 |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  |  |  |  |  | 32,511 |  |  |  |  |  |  |
Goodwill expected to be deductible for taxes |  |  |  |  |  |  |  |  |  |  | 16,300 |  |  |  |  |  |  |
Acquired intangible assets |  |  |  |  |  |  |  |  |  |  | $ 12,300 |  |  |  |  |  |  |
ATP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  | $ 29,034 |  |  |  |  |
Purchase price |  |  |  |  |  |  |  |  |  |  |  |  | 65,254 |  |  |  |  |
Goodwill expected to be deductible for taxes |  |  |  |  |  |  |  |  |  |  |  | $ 31,900 |  |  |  |  |  |
Acquired intangible assets |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,000 |  |  |  |  |
Workhorse |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 22,273 |  |  |  |
Purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  | 43,827 |  |  |  |
Goodwill expected to be deductible for taxes |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9,200 |  |  |  |
Goodwill deductible for taxes (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 38.00% |  |  |  |
Acquired intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 21,500 |  |  |  |
Precision Turbo |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,248 |  |
Purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,853 |  |
Goodwill expected to be deductible for taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,200 |  |
Acquired intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,200 |  |
Unitrac |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,442
Purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14,771
Goodwill expected to be deductible for taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,400
Acquired intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,230
AM General |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  | $ 12,943 |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  |  |  |  | 10,416 |  |  |  |  |  |  |  |
Goodwill expected to be deductible for taxes |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |
Acquired intangible assets |  |  |  |  |  |  |  |  |  | $ 12,097 |  |  |  |  |  |  |  |
Gerken |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 17,470 |
Purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 62,847 |
Goodwill expected to be deductible for taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |
Acquired intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 30,560 |
Acquisitions other than Faiveley |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deposit in escrow |  |  |  |  |  | 44,400 |  |  |  |  |  |  |  |  |  |  |  |
Recent Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | 1,389,600 |  |  |  |  |  |  |  |  |  |  |  |
Goodwill and other intangible assets |  |  |  |  |  | 2,117,800 |  |  |  |  |  |  |  |  |  |  |  |
Acquired intangible assets |  |  |  |  |  | 728,200 |  |  |  |  |  |  |  |  |  |  |  |
Recent Acquisitions | Trade Names |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired intangible assets |  |  |  |  |  | 380,900 |  |  |  |  |  |  |  |  |  |  |  |
Recent Acquisitions | Intellectual Property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired intangible assets |  |  |  |  |  | $ 5,000 |  |  |  |  |  |  |  |  |  |  |  |
Average useful life, years |  |  |  |  |  | 20 years |  |  |  |  |  |  |  |  |  |  |  |
Recent Acquisitions | Customer Relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired intangible assets |  |  |  |  |  | $ 336,900 |  |  |  |  |  |  |  |  |  |  |  |
Average useful life, years |  |  |  |  |  | 20 years |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: 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=84161108&loc=d3e4845-128472 + Details
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- Definition Amount of liabilities due within one year or within the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: 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=84161108&loc=d3e4845-128472 + Details
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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: 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=84161108&loc=d3e4845-128472 + Details
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- Definition Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed. + References Reference 1: 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=84161108&loc=d3e4845-128472 + Details
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- Definition Percentage of voting equity interests acquired in a business combination achieved in stages, including equity interests in the acquiree held by the acquirer immediately before the acquisition date and acquired at the acquisition date. + References No definition available. + Details
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- Definition The cash inflow associated with the acquisition of business during the period (for example, cash that was held by the acquired business). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
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- Definition The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details
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- Definition Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e961-128460 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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