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Fair Value Measurements - Summary of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets of deferred compensation plan | $ 127,332 | $ 106,851 |
Available-for-sale debt securities | 25,708 | 60,659 | $ 56,556
Deferred compensation plan liabilities | (127,332) | (106,851) |
Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets of deferred compensation plan | 127,332 | 106,851 |
Available-for-sale debt securities | 25,708 | 60,659 |
Deferred compensation plan liabilities | (127,332) | (106,851) |
Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Interest rate swaps, net | (2,565) | (525) |
Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Contingent purchase price liabilities | $ (54,391) | $ (32,089) |

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