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Acquisitions (Consideration Transferred) (Detail) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Aug. 01, 2017 | Dec. 31, 2019 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |
Equity consideration |  | $ 53,938 | $ 247,575
Working capital adjustment |  |  | $ 425
C Technologies, Inc. |  |  |
Business Acquisition [Line Items] |  |  |
Cash consideration |  | 185,949 |
Equity consideration |  | 53,938 |
Fair value of net assets acquired |  | $ 239,887 |
Spectrum Inc. |  |  |
Business Acquisition [Line Items] |  |  |
Cash consideration | $ 122,932 |  |
Equity consideration | 247,575 |  |
Working capital adjustment | 425 |  |
Fair value of net assets acquired | $ 370,932 |  |

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