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ACQUISITIONS - Summary of Fair Value of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 04, 2017 | Oct. 02, 2017 | Apr. 05, 2017 | Mar. 13, 2017 | Dec. 31, 2016 | Dec. 14, 2016 | Nov. 17, 2016 | Aug. 01, 2016 | May 05, 2016
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill | $ 2,460,103 |  |  |  |  | $ 2,078,765 |  |  |  |
Melett |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Current assets |  | $ 21,068 |  |  |  |  |  |  |  |
Property, plant & equipment |  | 5,917 |  |  |  |  |  |  |  |
Goodwill |  | 22,501 |  |  |  |  |  |  |  |
Other intangible assets |  | 39,259 |  |  |  |  |  |  |  |
Total assets acquired |  | 88,745 |  |  |  |  |  |  |  |
Total liabilities assumed |  | (14,789) |  |  |  |  |  |  |  |
Net assets acquired |  | $ 73,956 |  |  |  |  |  |  |  |
TTC |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Current assets |  |  |  | $ 3,746 |  |  |  |  |  |
Property, plant & equipment |  |  |  | 5,909 |  |  |  |  |  |
Goodwill |  |  |  | 16,309 |  |  |  |  |  |
Other intangible assets |  |  |  | 12,300 |  |  |  |  |  |
Total assets acquired |  |  |  | 38,264 |  |  |  |  |  |
Total liabilities assumed |  |  |  | (5,753) |  |  |  |  |  |
Net assets acquired |  |  |  | $ 32,511 |  |  |  |  |  |
ATP |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Current assets |  |  |  |  | $ 11,666 |  |  |  |  |
Property, plant & equipment |  |  |  |  | 5,354 |  |  |  |  |
Goodwill |  |  |  |  | 29,034 |  |  |  |  |
Other intangible assets |  |  |  |  | 25,000 |  |  |  |  |
Total assets acquired |  |  |  |  | 71,054 |  |  |  |  |
Total liabilities assumed |  |  |  |  | (5,800) |  |  |  |  |
Net assets acquired |  |  |  |  | $ 65,254 |  |  |  |  |
Workhorse |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Current assets |  |  |  |  |  |  | $ 9,137 |  |  |
Property, plant & equipment |  |  |  |  |  |  | 0 |  |  |
Goodwill |  |  |  |  |  |  | 22,273 |  |  |
Other intangible assets |  |  |  |  |  |  | 21,500 |  |  |
Total assets acquired |  |  |  |  |  |  | 52,910 |  |  |
Total liabilities assumed |  |  |  |  |  |  | (9,083) |  |  |
Net assets acquired |  |  |  |  |  |  | $ 43,827 |  |  |
Precision Turbo |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Current assets |  |  |  |  |  |  |  | $ 4,145 |  |
Property, plant & equipment |  |  |  |  |  |  |  | 1,317 |  |
Goodwill |  |  |  |  |  |  |  | 4,248 |  |
Other intangible assets |  |  |  |  |  |  |  | 5,200 |  |
Total assets acquired |  |  |  |  |  |  |  | 14,910 |  |
Total liabilities assumed |  |  |  |  |  |  |  | (1,057) |  |
Net assets acquired |  |  |  |  |  |  |  | $ 13,853 |  |
Unitrac |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Current assets |  |  |  |  |  |  |  |  |  | $ 11,476
Property, plant & equipment |  |  |  |  |  |  |  |  |  | 1,768
Goodwill |  |  |  |  |  |  |  |  |  | 2,442
Other intangible assets |  |  |  |  |  |  |  |  |  | 1,230
Total assets acquired |  |  |  |  |  |  |  |  |  | 16,916
Total liabilities assumed |  |  |  |  |  |  |  |  |  | (2,145)
Net assets acquired |  |  |  |  |  |  |  |  |  | $ 14,771
AM General |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Current assets |  |  | $ 6,611 |  |  |  |  |  |  |
Property, plant & equipment |  |  | 4,140 |  |  |  |  |  |  |
Goodwill |  |  | 12,943 |  |  |  |  |  |  |
Other intangible assets |  |  | 12,097 |  |  |  |  |  |  |
Other assets |  |  | 0 |  |  |  |  |  |  |
Total assets acquired |  |  | 35,791 |  |  |  |  |  |  |
Total liabilities assumed |  |  | (25,375) |  |  |  |  |  |  |
Net assets acquired |  |  | $ 10,416 |  |  |  |  |  |  |
Gerken |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Current assets |  |  |  |  |  |  |  |  | $ 32,706 |
Property, plant & equipment |  |  |  |  |  |  |  |  | 7,667 |
Goodwill |  |  |  |  |  |  |  |  | 17,470 |
Other intangible assets |  |  |  |  |  |  |  |  | 30,560 |
Other assets |  |  |  |  |  |  |  |  | 1,706 |
Total assets acquired |  |  |  |  |  |  |  |  | 90,109 |
Total liabilities assumed |  |  |  |  |  |  |  |  | (27,262) |
Net assets acquired |  |  |  |  |  |  |  |  | $ 62,847 |

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