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Acquisitions (Tables) | 12 Months Ended
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Dec. 31, 2020
Business Combinations [Abstract] |
Summary of Changes in Goodwill | The following table summarizes changes in goodwill for the years 2019 and 2020 (in thousands):
Balance at January 1, 2019 |  | $ | 2,044,837 |
Increase from contribution of redeemable noncontrolling interests |  |  | 3,300 |
Increase from 2019 acquisitions |  |  | 36,967 |
Goodwill at December 31, 2019 |  |  | 2,085,104 |
Increase from contribution of redeemable noncontrolling interests |  |  | 20,200 |
Adjustments related to 2019 acquisitions |  |  | (40 | )
Goodwill at December 31, 2020 |  | $ | 2,105,264 |
Transaction Related Expenses as Incurred | Transaction-related expenses represent costs primarily related to termination, restructuring, strategic review, management transition and other acquisition-related costs. Transaction-related expenses comprised the following costs for the years ended years ended December 31, 2020, 2019 and 2018 (in thousands):
|  | Year Ended December 31, |
|  | 2020 |  |  | 2019 |  |  | 2018 |
Legal, accounting and other acquisition-related costs |  | $ | 8,252 |  |  | $ | 3,030 |  |  | $ | 3,152 |
Termination, restructuring and strategic review costs |  |  | 3,468 |  |  |  | 12,598 |  |  |  | 12,534 |
Management transition costs |  |  | — |  |  |  | 5,529 |  |  |  | 14,033 |
|  | $ | 11,720 |  |  | $ | 21,157 |  |  | $ | 29,719 |

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