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Acquisitions - Summary of Preliminary Estimated Fair Values of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands | Jun. 30, 2017 | Apr. 05, 2017 | Mar. 14, 2017 | Dec. 31, 2016 | Dec. 14, 2016 | Nov. 17, 2016 | Aug. 01, 2016 | May 05, 2016
--- | --- | --- | --- | --- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Goodwill | $ 2,343,608 |  |  | $ 2,078,765 |  |  |  |
TTC |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Current assets |  | $ 3,746 |  |  |  |  |  |
Property, plant & equipment |  | 5,909 |  |  |  |  |  |
Goodwill |  | 21,122 |  |  |  |  |  |
Other intangible assets |  | 11,800 |  |  |  |  |  |
Other assets |  | 0 |  |  |  |  |  |
Total assets acquired |  | 42,577 |  |  |  |  |  |
Total liabilities assumed |  | (10,066) |  |  |  |  |  |
Net assets acquired |  | $ 32,511 |  |  |  |  |  |
ATP |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Current assets |  |  | $ 11,679 |  |  |  |  |
Property, plant & equipment |  |  | 5,354 |  |  |  |  |
Goodwill |  |  | 41,036 |  |  |  |  |
Other intangible assets |  |  | 22,100 |  |  |  |  |
Other assets |  |  | 0 |  |  |  |  |
Total assets acquired |  |  | 80,169 |  |  |  |  |
Total liabilities assumed |  |  | (14,915) |  |  |  |  |
Net assets acquired |  |  | $ 65,254 |  |  |  |  |
Workhorse |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Current assets |  |  |  |  | $ 9,137 |  |  |
Property, plant & equipment |  |  |  |  | 0 |  |  |
Goodwill |  |  |  |  | 24,373 |  |  |
Other intangible assets |  |  |  |  | 19,400 |  |  |
Other assets |  |  |  |  | 0 |  |  |
Total assets acquired |  |  |  |  | 52,910 |  |  |
Total liabilities assumed |  |  |  |  | (9,083) |  |  |
Net assets acquired |  |  |  |  | $ 43,827 |  |  |
Precision Turbo |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Current assets |  |  |  |  |  | $ 4,146 |  |
Property, plant & equipment |  |  |  |  |  | 1,346 |  |
Goodwill |  |  |  |  |  | 3,959 |  |
Other intangible assets |  |  |  |  |  | 5,200 |  |
Other assets |  |  |  |  |  | 0 |  |
Total assets acquired |  |  |  |  |  | 14,651 |  |
Total liabilities assumed |  |  |  |  |  | (825) |  |
Net assets acquired |  |  |  |  |  | $ 13,826 |  |
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 |
Unitrac |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Current assets |  |  |  |  |  |  |  | $ 11,476
Property, plant & equipment |  |  |  |  |  |  |  | 1,768
Goodwill |  |  |  |  |  |  |  | 2,442
Other intangible assets |  |  |  |  |  |  |  | 1,230
Other assets |  |  |  |  |  |  |  | 0
Total assets acquired |  |  |  |  |  |  |  | 16,916
Total liabilities assumed |  |  |  |  |  |  |  | (2,145)
Net assets acquired |  |  |  |  |  |  |  | $ 14,771

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