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ACQUISITIONS - Narrative (Detail) $ in Thousands |  |  |  |  | 3 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 ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Mar. 22, 2018 USD ($) | Dec. 04, 2017 USD ($) | Oct. 02, 2017 USD ($) | Apr. 05, 2017 USD ($) | Mar. 13, 2017 USD ($) | Nov. 30, 2016 € / shares
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock and cash paid |  |  |  |  |  | $ 58,850 | $ 1,006,207 | $ 904,695 |  |  |  |  |  |
Stock used for acquisition |  |  |  |  |  | 0 | 25,500 | 534,679 |  |  |  |  |  |
Non-controlling interests associated with Faiveley Transport Acquisition |  |  |  |  |  |  |  | $ 760,599 |  |  |  |  |  |
Goodwill |  |  |  |  |  | 2,396,544 | 2,460,103 |  |  |  |  |  |  |
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% |  |  |  |  |  |  |  |  |  |  |
Stock and cash paid | $ 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 |  |  |  |  |  |  |
Non-controlling interests associated with Faiveley Transport Acquisition |  |  |  |  | $ 8,900 |  |  |  |  |  |  |  |  |
Adjustment for changes in receivables |  |  |  | 439,631 |  |  |  |  |  |  |  |  |  |
Adjustment for changes in liabilities |  |  |  | 819,493 |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | $ 1,262,350 |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  | $ 26,653 |  |  |  |
Purchase price |  |  |  |  |  |  |  |  |  | 71,893 |  |  |  |
Goodwill expected to be deductible for taxes |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Acquired intangible assets |  |  |  |  |  |  |  |  |  | $ 28,590 |  |  |  |
TTC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  | $ 14,095 |  |
Purchase price |  |  |  |  |  |  |  |  |  |  |  | 32,511 |  |
Goodwill expected to be deductible for taxes |  |  |  |  |  |  |  |  |  |  |  | 14,100 |  |
Acquired intangible assets |  |  |  |  |  |  |  |  |  |  |  | $ 12,300 |  |
ATP |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  | $ 29,034 |
Purchase price |  |  |  |  |  |  |  |  |  |  |  |  | 65,254 |
Goodwill expected to be deductible for taxes |  |  |  |  |  |  |  |  |  |  |  |  | 29,000 |
Acquired intangible assets |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,000 |
Annax |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  | $ 25,471 |  |  |  |  |
Purchase price |  |  |  |  |  |  |  |  | 28,664 |  |  |  |  |
Goodwill expected to be deductible for taxes |  |  |  |  |  |  |  |  | 0 |  |  |  |  |
Acquired intangible assets |  |  |  |  |  |  |  |  | $ 12,828 |  |  |  |  |
AM General |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  | $ 6,114 |  |  |
Purchase price |  |  |  |  |  |  |  |  |  |  | 10,416 |  |  |
Goodwill expected to be deductible for taxes |  |  |  |  |  |  |  |  |  |  | 0 |  |  |
Acquired intangible assets |  |  |  |  |  |  |  |  |  |  | $ 19,427 |  |  |
Acquisitions other than Faiveley |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deposit in escrow |  |  |  |  |  | 24,400 |  |  |  |  |  |  |  |
Recent Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | 101,400 |  |  |  |  |  |  |  |
Goodwill and other intangible assets |  |  |  |  |  | 199,500 |  |  |  |  |  |  |  |
Acquired intangible assets |  |  |  |  |  | 98,100 |  |  |  |  |  |  |  |
Recent Acquisitions | Trade names |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired intangible assets |  |  |  |  |  | $ 22,300 |  |  |  |  |  |  |  |
Recent Acquisitions | Intellectual Property |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average useful life, years |  |  |  |  |  | 20 years |  |  |  |  |  |  |  |
Recent Acquisitions | Customer Relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired intangible assets |  |  |  |  |  | $ 70,200 |  |  |  |  |  |  |  |
Average useful life, years |  |  |  |  |  | 20 years |  |  |  |  |  |  |  |

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