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Acquisitions - Additional Information (Details) |  |  |  |  | 3 Months Ended | 4 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, 2018 USD ($) | Mar. 31, 2017 USD ($) | Mar. 21, 2017 USD ($) | Dec. 31, 2017 USD ($) | Mar. 22, 2018 USD ($) | Dec. 04, 2017 USD ($) | Oct. 02, 2017 USD ($) | Apr. 05, 2017 USD ($) | Mar. 13, 2017 USD ($) | Dec. 31, 2016 USD ($) | Nov. 30, 2016 € / shares | Nov. 17, 2016 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additions |  |  |  |  | $ 24,420,000 |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | $ 2,528,819,000 |  |  | $ 2,460,103,000 |  |  |  |  |  |  |  |
Customer Relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets, weighted average useful life (years) |  |  |  |  | 20 years |  |  |  |  |  |  |  |  |  |  |
Faiveley Transport |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual sales of Faiveley |  |  |  | $ 1,200,000,000 |  |  |  |  |  |  |  |  |  |  |  |
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 |
Outstanding share capital acquired (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 51.00% |
Percentage of voting interests in Faiveley (as a percent) | 100.00% | 22.00% | 27.00% |  |  |  | 100.00% |  |  |  |  |  |  |  | 49.00% |
Share conversion ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.1538 |
Additional share capital acquired (as a percent) |  | 21.00% | 27.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Cash payment for acquisition | $ 17,500,000 | $ 303,200,000 | $ 411,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Equity issued in acquisition |  | $ 300,000 | $ 25,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative share capital acquired (as a percent) | 100.00% | 99.00% | 78.00% |  |  |  | 100.00% |  |  |  |  |  |  |  |  |
Cumulative voting rights acquired (as a percent) | 100.00% | 98.00% | 76.00% |  |  |  | 100.00% |  |  |  |  |  |  |  |  |
Business combination, consideration transferred |  |  |  |  |  |  | $ 1,507,000,000 |  |  |  |  |  |  |  |  |
Escrow deposits |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 744,700,000 |  |
Acquisition of noncontrolling interest |  |  |  |  |  | $ 8,900,000 |  |  |  |  |  |  |  |  |  |
Adjustment to current liabilities acquired |  |  |  |  |  |  |  | 65,300,000 |  |  |  |  |  |  |  |
Accounts receivable | $ 439,631,000 |  |  |  |  |  | 439,631,000 |  |  |  |  |  |  |  |  |
Current liabilities | 819,493,000 |  |  |  |  |  | 819,493,000 |  |  |  |  |  |  |  |  |
Adjustment to other noncurrent assets |  |  |  |  |  |  |  | 30,000,000 |  |  |  |  |  |  |  |
Additions |  |  |  |  |  |  |  | 74,100,000 |  |  |  |  |  |  |  |
Accrued share based compensation acquired in acquisition |  |  |  |  | $ 25,900,000 |  |  |  |  |  |  |  |  |  |  |
Goodwill | 1,262,350,000 |  |  |  |  |  | 1,262,350,000 |  |  |  |  |  |  |  |  |
Faiveley Transport | Customer Relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustment to customer relationships acquired |  |  |  |  |  |  |  | 21,800,000 |  |  |  |  |  |  |  |
Faiveley Transport | Restatement Adjustment | Fair Value of Receivables |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable |  |  |  |  |  |  |  | 2,800,000 |  |  |  |  |  |  |  |
Faiveley Transport | Restatement Adjustment | Fair Value of Current Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current liabilities |  |  |  |  |  |  |  | 36,200,000 |  |  |  |  |  |  |  |
Faiveley Transport | Restatement Adjustment | Fair Value of Assets Acquired and Liabilities Assumed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable |  |  |  |  |  |  |  | 64,300,000 |  |  |  |  |  |  |  |
Current liabilities |  |  |  |  |  | $ 64,300,000 |  |  |  |  |  |  |  |  |  |
Faiveley Transport | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of business acquisition consideration payable in cash (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25.00% |
Faiveley Transport | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of business acquisition consideration payable in cash (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 45.00% |
Acquisitions other than Faiveley |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Escrow deposits |  |  |  |  | 36,400,000 |  |  |  |  |  |  |  |  |  |  |
Goodwill and other intangible assets acquired |  |  |  |  | 203,300,000 |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | 99,400,000 |  |  |  |  |  |  |  |  |  |  |
Acquired indefinite-lived intangible assets |  |  |  |  | 103,900,000 |  |  |  |  |  |  |  |  |  |  |
Acquisitions other than Faiveley | Customer Relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired indefinite-lived intangible assets |  |  |  |  | $ 67,600,000 |  |  |  |  |  |  |  |  |  |  |
Intangible assets, weighted average useful life (years) |  |  |  |  | 20 years |  |  |  |  |  |  |  |  |  |  |
Acquisitions other than Faiveley | Trade Names |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired indefinite-lived intangible assets |  |  |  |  | $ 31,900,000 |  |  |  |  |  |  |  |  |  |  |
Melett |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price, net of cash acquired |  |  |  |  |  |  |  |  |  | $ 73,956,000 |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  | 28,801,000 |  |  |  |  |  |
Goodwill tax deduction |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Acquired indefinite-lived intangible assets |  |  |  |  |  |  |  |  |  | $ 30,479,000 |  |  |  |  |  |
TTC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price, net of cash acquired |  |  |  |  |  |  |  |  |  |  |  | $ 32,511,000 |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  | 14,095,000 |  |  |  |
Goodwill tax deduction |  |  |  |  |  |  |  |  |  |  |  | 14,100,000 |  |  |  |
Acquired indefinite-lived intangible assets |  |  |  |  |  |  |  |  |  |  |  | $ 12,300,000 |  |  |  |
ATP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price, net of cash acquired |  |  |  |  |  |  |  |  |  |  |  |  | $ 65,254,000 |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  | 29,034,000 |  |  |
Goodwill tax deduction |  |  |  |  |  |  |  |  |  |  |  |  | 29,000,000 |  |  |
Acquired indefinite-lived intangible assets |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,000,000 |  |  |
Annax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price, net of cash acquired |  |  |  |  |  |  |  |  | $ 28,667,000 |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  | 14,507,000 |  |  |  |  |  |  |
Goodwill tax deduction |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |
Acquired indefinite-lived intangible assets |  |  |  |  |  |  |  |  | $ 23,998,000 |  |  |  |  |  |  |
AM General |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price, net of cash acquired |  |  |  |  |  |  |  |  |  |  | $ 10,416,000 |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  | 12,944,000 |  |  |  |  |
Goodwill tax deduction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0
Acquired indefinite-lived intangible assets |  |  |  |  |  |  |  |  |  |  | $ 12,097,000 |  |  |  |  |
Freight Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additions |  |  |  |  | 9,938,000 |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | 730,298,000 |  |  | 718,958,000 |  |  |  |  |  |  |  |
Freight Segment | Faiveley Transport |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | 72,000,000 |  |  |  |  |  | 72,000,000 |  |  |  |  |  |  |  |  |
Transit Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additions |  |  |  |  | 14,482,000 |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | $ 1,798,521,000 |  |  | $ 1,741,145,000 |  |  |  |  |  |  |  |
Transit Segment | Faiveley Transport |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | $ 1,190,400,000 |  |  |  |  |  | $ 1,190,400,000 |  |  |  |  |  |  |  |  |

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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + 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 (c) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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- Definition Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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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 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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