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Summary of Significant Accounting Policies - Composition of Underlying Assets Comprising Company's Deferred Compensation Plans Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |
Deferred Compensation Plan Assets, Current | $ 406,634 | $ 398,442
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |
Deferred Compensation Plan Assets, Current | 406,634 | 398,442
Significant Other Observable Inputs (Level 2) |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |
Deferred Compensation Plan Assets, Current | 0 | 0
Significant Unobservable Inputs (Level 3) |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |
Deferred Compensation Plan Assets, Current | 0 | 0
Money market funds |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |
Deferred Compensation Plan Assets, Current | 69,681 | 141,295
Money market funds | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |
Deferred Compensation Plan Assets, Current | 69,681 | 141,295
Money market funds | Significant Other Observable Inputs (Level 2) |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |
Deferred Compensation Plan Assets, Current | 0 | 0
Money market funds | Significant Unobservable Inputs (Level 3) |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |
Deferred Compensation Plan Assets, Current | 0 | 0
Mutual funds - bond |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |
Deferred Compensation Plan Assets, Current | 27,282 | 28,451
Mutual funds - bond | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |
Deferred Compensation Plan Assets, Current | 27,282 | 28,451
Mutual funds - bond | Significant Other Observable Inputs (Level 2) |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |
Deferred Compensation Plan Assets, Current | 0 | 0
Mutual funds - bond | Significant Unobservable Inputs (Level 3) |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |
Deferred Compensation Plan Assets, Current | 0 | 0
Mutual funds - stock |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |
Deferred Compensation Plan Assets, Current | 234,667 | 170,469
Mutual funds - stock | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |
Deferred Compensation Plan Assets, Current | 234,667 | 170,469
Mutual funds - stock | Significant Other Observable Inputs (Level 2) |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |
Deferred Compensation Plan Assets, Current | 0 | 0
Mutual funds - stock | Significant Unobservable Inputs (Level 3) |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |
Deferred Compensation Plan Assets, Current | 0 | 0
Mutual funds - blend |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |
Deferred Compensation Plan Assets, Current | 75,004 | 58,227
Mutual funds - blend | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |
Deferred Compensation Plan Assets, Current | 75,004 | 58,227
Mutual funds - blend | Significant Other Observable Inputs (Level 2) |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |
Deferred Compensation Plan Assets, Current | 0 | 0
Mutual funds - blend | Significant Unobservable Inputs (Level 3) |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |
Deferred Compensation Plan Assets, Current | $ 0 | $ 0

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