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Fair Value Measurements - Fair Value of Financial Assets and Liabilities (Detail) - USD ($) | Jun. 30, 2021 | Dec. 31, 2020
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Quoted Price in Active Markets For Identical Assets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial assets remeasured | $ 0 | $ 0
Liabilities remeasured | 0 | 0
Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of other non-current assets | 24,931,000 | 24,449,000
Fair value of financial assets, Total | 27,032,000 | 26,864,000
Fair value of other current liabilities | 34,313,000 |
Fair value of other non-current liabilities | 52,782,000 | 80,092,000
Fair value of financial liabilities, Total | 87,095,000 | 82,507,000
Fair Value, Measurements, Recurring | NQDC Plan liability |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of other current liabilities | 2,101,000 | 2,415,000
Fair value of other non-current liabilities | 22,022,000 | 19,962,000
Fair Value, Measurements, Recurring | Contingent consideration |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of other current liabilities | 32,212,000 |
Fair value of other non-current liabilities | 30,760,000 | 60,130,000
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of other non-current assets | 24,931,000 | 24,449,000
Fair value of financial assets, Total | 27,032,000 | 26,864,000
Fair value of other current liabilities | 2,101,000 |
Fair value of other non-current liabilities | 22,022,000 | 19,962,000
Fair value of financial liabilities, Total | 24,123,000 | 22,377,000
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | NQDC Plan liability |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of other current liabilities | 2,101,000 | 2,415,000
Fair value of other non-current liabilities | 22,022,000 | 19,962,000
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Contingent consideration |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of other current liabilities | 0 |
Fair value of other non-current liabilities | 0 | 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of other non-current assets | 0 | 0
Fair value of financial assets, Total | 0 | 0
Fair value of other current liabilities | 32,212,000 |
Fair value of other non-current liabilities | 30,760,000 | 60,130,000
Fair value of financial liabilities, Total | 62,972,000 | 60,130,000
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | NQDC Plan liability |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of other current liabilities | 0 | 0
Fair value of other non-current liabilities | 0 | 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Contingent consideration |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of other current liabilities | 32,212,000 |
Fair value of other non-current liabilities | 30,760,000 | 60,130,000
Fair Value, Measurements, Recurring | NQDC Plan assets |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of other current assets | 2,101,000 | 2,415,000
Fair value of other non-current assets | 22,022,000 | 19,962,000
Fair Value, Measurements, Recurring | NQDC Plan assets | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of other current assets | 2,101,000 | 2,415,000
Fair value of other non-current assets | 22,022,000 | 19,962,000
Fair Value, Measurements, Recurring | NQDC Plan assets | Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of other current assets | 0 | 0
Fair value of other non-current assets | 0 | 0
Fair Value, Measurements, Recurring | Restricted Investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of other non-current assets | 2,909,000 | 4,487,000
Fair Value, Measurements, Recurring | Restricted Investments | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of other non-current assets | 2,909,000 | 4,487,000
Fair Value, Measurements, Recurring | Restricted Investments | Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of other non-current assets | $ 0 | $ 0

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