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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 | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Assets |  |
Investments in equity securities | $ 39,396 | $ 39,951
Fair Value, Measurements, Recurring |  |
Assets |  |
Investments in equity securities | 39,396 |
Liabilities |  |
Contingent earn-out obligations | 24,057 |
Temporary equity |  |
Noncontrolling interests subject to put provisions | 1,241,937 |
Fair Value, Measurements, Recurring | Interest rate cap agreements |  |
Assets |  |
Interest rate cap agreements | 4,675 |
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1) |  |
Assets |  |
Investments in equity securities | 39,396 |
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 | 4,675 |
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) |  |
Assets |  |
Investments in equity securities | 0 |
Liabilities |  |
Contingent earn-out obligations | 24,057 |
Temporary equity |  |
Noncontrolling interests subject to put provisions | 1,241,937 |
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Interest rate cap agreements |  |
Assets |  |
Interest rate cap agreements | $ 0 |

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- Definition Amount of liability recognized arising from contingent consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116859824&loc=d3e6819-128478 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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