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Fair Value of Financial Assets and Liabilities - Quantitative Information about Level 3 Fair Value Measurements on Recurring Basis (Detail) - Level 3 $ in Thousands | Sep. 30, 2021 USD ($) | Dec. 31, 2020 USD ($)
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, fair value | $ 0 | $ 0
Liabilities, fair value | $ 27,484 | $ 39,791
Minimum | Discount Rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Contingent consideration, liability, measurement input | 0.068 | 0.068
Minimum | Probability of Meeting Earnout and Contingencies |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Contingent consideration, liability, measurement input | 0.11 | 0.39
Maximum | Discount Rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Contingent consideration, liability, measurement input | 0.103 | 0.103
Maximum | Probability of Meeting Earnout and Contingencies |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Contingent consideration, liability, measurement input | 1 | 1
Weighted Average | Discount Rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Contingent consideration, liability, measurement input | 0.098 | 0.095
Weighted Average | Probability of Meeting Earnout and Contingencies |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Contingent consideration, liability, measurement input | 0.710 | 0.829

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