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Acquisitions - Summary of Preliminary Estimated Fair Values of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Mar. 22, 2018 | Dec. 31, 2017 | Dec. 04, 2017 | Oct. 02, 2017 | Apr. 05, 2017 | Mar. 13, 2017
--- | --- | --- | --- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill | $ 2,412,554 |  | $ 2,460,103 |  |  |  |
Annax |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Current assets |  | $ 34,036 |  |  |  |  |
Property, plant & equipment |  | 674 |  |  |  |  |
Goodwill |  | 14,301 |  |  |  |  |
Other intangible assets |  | 23,998 |  |  |  |  |
Total assets acquired |  | 73,009 |  |  |  |  |
Total liabilities assumed |  | (44,345) |  |  |  |  |
Net assets acquired |  | $ 28,664 |  |  |  |  |
Melett |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Current assets |  |  |  | $ 35,258 |  |  |
Property, plant & equipment |  |  |  | 5,917 |  |  |
Goodwill |  |  |  | 25,732 |  |  |
Other intangible assets |  |  |  | 30,479 |  |  |
Total assets acquired |  |  |  | 97,386 |  |  |
Total liabilities assumed |  |  |  | (25,493) |  |  |
Net assets acquired |  |  |  | $ 71,893 |  |  |
AM General |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Current assets |  |  |  |  | $ 6,610 |  |
Property, plant & equipment |  |  |  |  | 4,140 |  |
Goodwill |  |  |  |  | 12,944 |  |
Other intangible assets |  |  |  |  | 12,097 |  |
Total assets acquired |  |  |  |  | 35,791 |  |
Total liabilities assumed |  |  |  |  | (25,375) |  |
Net assets acquired |  |  |  |  | $ 10,416 |  |
TTC |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Current assets |  |  |  |  |  | $ 3,744 |
Property, plant & equipment |  |  |  |  |  | 5,413 |
Goodwill |  |  |  |  |  | 14,095 |
Other intangible assets |  |  |  |  |  | 12,300 |
Total assets acquired |  |  |  |  |  | 35,552 |
Total liabilities assumed |  |  |  |  |  | (3,041) |
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

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