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Business Combinations - Summary of Fair Value of Consideration for Acquired Business (Parenthetical) (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Jul. 13, 2017
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Business Acquisition [Line Items] |  |
Fair value of contingent consideration | $ 17,125 |
Info Trellis Inc [Member] |  |
Business Acquisition [Line Items] |  |
Fair value of contingent consideration |  | $ 17,125

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