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Accrued Payroll and Benefit Costs (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Payables and Accruals [Abstract] |  |  |
Employee deferred compensation plans | $ 421,198 | $ 333,528 |
Payroll and benefits | 280,918 | 263,072 |
Payroll taxes | 21,831 | 23,918 |
Workers’ compensation | 19,655 | 18,251 |
Accrued payroll and benefit costs | 743,602 | 638,769 |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |  |
Asset value of nonqualified plans | 398,442 | 311,708 |
Employee deferred compensation plans | 421,198 | 333,528 |
Net unrealized gains (losses) on nonqualified plan assets and liabilities | 44,200 | (26,600) | $ 19,400
Contribution expense for qualified and nonqualified plans | 26,100 | 24,200 | $ 21,100
Nonqualified Plan |  |  |
Payables and Accruals [Abstract] |  |  |
Employee deferred compensation plans | 421,200 | 333,500 |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |  |
Asset value of nonqualified plans | 398,400 | 311,700 |
Employee deferred compensation plans | 421,200 | 333,500 |
Nonqualified Plan | Chief Executive Officer |  |  |
Payables and Accruals [Abstract] |  |  |
Employee deferred compensation plans | 91,800 | 89,200 |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |  |
Employee deferred compensation plans | $ 91,800 | $ 89,200 |

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- Definition Carrying value as of the balance sheet date of obligations incurred and payable for statutory payroll taxes incurred through that date and withheld from employees pertaining to services received from them, including entity's matching share of the employees FICA taxes and contributions to the state and federal unemployment insurance programs. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=118951113&loc=d3e6935-107765 + Details
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