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Fair Value Measurements - Schedule of Reconciliation of CVR Liability (Detail) - Level 3 Inputs [Member] - Contingent Value Right [Member] $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($)
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |
Fair value as of December 31, 2017 | $ 6.9 |
Net unrealized loss | 8.8 | [1]
Fair value as of December 31, 2018 | $ 15.7 |
[1] | Unrealized gains and losses related to the revaluation of the CVR are recorded in other expense (income), net within the Company’s consolidated statements of income.

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