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Acquisitions - Additional Information (Details) |  |  |  |  | 3 Months Ended | 4 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 21, 2017 USD ($) | Mar. 06, 2017 USD ($) | Feb. 03, 2017 USD ($) | Nov. 30, 2016 USD ($) employee country | Mar. 31, 2017 USD ($) | Mar. 21, 2017 USD ($) | Sep. 30, 2018 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
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additions |  |  |  |  |  |  | $ 18,959,000 |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | 2,412,554,000 | $ 2,460,103,000 |  |  |  |  |  |  |
Customer Relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired indefinite-lived intangible assets |  |  |  |  |  |  | $ 67,600,000 |  |  |  |  |  |  |  |
Intangible assets, weighted average useful life (years) |  |  |  |  |  |  | 20 years |  |  |  |  |  |  |  |
Trade Names |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired indefinite-lived intangible assets |  |  |  |  |  |  | $ 31,900,000 |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  | 30,200,000 |  |  |  |  |  |  |  |
Other intangible assets |  |  |  |  |  |  | 103,900,000 |  |  |  |  |  |  |  |
TTC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price, net of cash acquired |  |  |  |  |  |  |  |  |  |  |  | $ 32,511,000 |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  | 14,095,000 |  |  |
Goodwill tax deduction |  |  |  |  |  |  |  |  |  |  |  | 14,100,000 |  |  |
Other 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 |  |
Other intangible assets |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,000,000 |  |
Melett |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price, net of cash acquired |  |  |  |  |  |  |  |  |  | $ 71,893,000 |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  | 25,732,000 |  |  |  |  |
Goodwill tax deduction |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |
Other intangible assets |  |  |  |  |  |  |  |  |  | $ 30,479,000 |  |  |  |  |
Annax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price, net of cash acquired |  |  |  |  |  |  |  |  | $ 28,664,000 |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  | 14,301,000 |  |  |  |  |  |
Goodwill tax deduction |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Other 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 |  |  |  |
Other intangible assets |  |  |  |  |  |  |  |  |  |  | $ 12,097,000 |  |  |  |
Freight Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additions |  |  |  |  |  |  | 5,252,000 |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | 716,500,000 | 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 |  |  |  |  |  |  | 13,707,000 |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | $ 1,696,054,000 | $ 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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