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Commitments and Contingencies - Contingent Consideration (Detail) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
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Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Contingent consideration, liability | $ 79.3 | $ 65.7

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