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Fair value of financial instruments - Assets, Liabilities and Temporary Equity Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Assets |  |
Investments in equity securities | $ 52,063 | $ 44,077
Fair Value, Measurements, Recurring |  |
Assets |  |
Investments in equity securities | 52,063 |
Liabilities |  |
Contingent earn-out obligations | 22,757 |
Temporary equity |  |
Noncontrolling interests subject to put provisions | 1,423,917 |
Fair Value, Measurements, Recurring | Interest rate cap agreements |  |
Assets |  |
Interest rate cap agreements | 5,955 |
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1) |  |
Assets |  |
Investments in equity securities | 52,063 |
Liabilities |  |
Contingent earn-out obligations | 0 |
Temporary equity |  |
Noncontrolling interests subject to put provisions | 0 |
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1) | Interest rate cap agreements |  |
Assets |  |
Interest rate cap agreements | 0 |
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) |  |
Assets |  |
Investments in equity securities | 0 |
Liabilities |  |
Contingent earn-out obligations | 0 |
Temporary equity |  |
Noncontrolling interests subject to put provisions | 0 |
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Interest rate cap agreements |  |
Assets |  |
Interest rate cap agreements | 5,955 |
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) |  |
Assets |  |
Investments in equity securities | 0 |
Liabilities |  |
Contingent earn-out obligations | 22,757 |
Temporary equity |  |
Noncontrolling interests subject to put provisions | 1,423,917 |
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Interest rate cap agreements |  |
Assets |  |
Interest rate cap agreements | $ 0 |

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