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Consideration Transferred (Detail) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Aug. 01, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |  |
Cash consideration |  |  | $ 112,795 | $ 44,614
Equity consideration |  |  | 247,575 | $ 14,135
Working capital adjustment |  |  | $ 425 |
Spectrum Inc. |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash consideration | $ 122,932 |  |  |
Equity consideration | 247,575 |  |  |
Working capital adjustment | 425 |  |  |
Total consideration transferred | $ 370,932 |  |  |

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