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Accounting Policies (Details) | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Oct. 01, 2019 USD ($) | Jan. 01, 2019 USD ($) | Dec. 31, 2017 USD ($) | Oct. 01, 2010 USD ($) | Sep. 30, 2010 USD ($)
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues(1) | [1] | $ 4,287,004,000 | $ 4,314,804,000 | $ 3,828,549,000 |  |  |  |  |  |  |
Segment Reporting [Abstract] |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments (integer) |  | 1 |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Gross |  |  |  |  | $ 495,078,000 | $ 403,301,000 |  |  |  |  |
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment |  |  |  |  | (278,822,000) | (255,595,000) |  |  |  |  |
Property, Plant and Equipment, Net |  |  |  |  | 216,256,000 | 147,706,000 |  |  |  |  |
Amortization of capitalized computer software costs |  | $ 8,700,000 | 7,800,000 | 6,000,000.0 |  |  |  |  |  |  |
Unamortized computer software costs |  |  |  |  | 32,600,000 | 25,800,000 |  |  |  |  |
Leases [Abstract] |  |  |  |  |  |  |  |  |  |  |
Right-of-use “ROU” leased assets |  |  |  |  | 60,663,000 | 56,886,000 |  | $ 50,800,000 |  |  |
Operating Lease, Liability |  |  |  |  | 80,807,000 |  |  | $ 63,700,000 |  |  |
Goodwill and Intangible Assets Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Goodwill, Impairment Loss |  | $ 0 |  |  |  |  |  |  |  |  |
Goodwill, Gross |  |  |  |  | 21,200,000 |  |  |  |  |  |
Goodwill, Impaired, Accumulated Impairment Loss |  |  |  |  | (8,500,000) |  |  |  |  |  |
Goodwill |  |  |  |  | 12,700,000 |  |  |  |  |  |
Health Insurance Costs [Abstract] |  |  |  |  |  |  |  |  |  |  |
Number of days cash in advance of beginning of reporting quarter United establishes cash funding rates |  | 90 days |  |  |  |  |  |  |  |  |
Prepaid health insurance |  |  |  |  | 9,000,000 | 9,000,000 |  |  |  |  |
Required deposit for health care costs |  |  |  |  | 6,500,000 |  |  |  |  |  |
Amount which Plan Costs were less than the net premiums paid and owed |  |  |  |  | (6,000,000.0) |  |  |  |  |  |
Portion of insurance costs that is less than the agreed upon surplus included in accrued health insurance costs a cnt liab |  |  |  |  | (15,000,000.0) |  |  |  |  |  |
Premiums owed to United |  |  |  |  | (11,700,000) |  |  |  |  |  |
Benefits Costs Incurred Related to Run-off |  |  |  | (1,300,000) | (200,000) | 2,300,000 |  |  |  |  |
Workers' Compensation Costs [Abstract] |  |  |  |  |  |  |  |  |  |  |
Company's maximum economic burden for the first layer of claims per occurrence |  |  |  |  |  |  | $ 1,500,000 |  |  |  | $ 1,000,000
Company's maximum aggregate economic burden for claims in excess of $1 million per policy year |  |  |  |  |  |  | $ 6,000,000 |  |  | $ 6,000,000 |
Reduction in accrued workers' compensation costs for changes in estimated losses |  | $ 42,100,000 | $ 31,700,000 | 18,800,000 |  |  |  |  |  |  |
U.S. Treasury rates that correspond with the weighted average estimated claim payout period (in hundredths) |  | 0.60% | 1.90% |  |  |  |  |  |  |  |
Restricted Cash and Cash Equivalents, Current |  |  |  | 42,227,000 | 45,522,000 | 49,295,000 |  |  | $ 41,137,000 |  |
Deposits workers' compensation |  |  |  | 166,474,000 | 186,331,000 | 175,913,000 |  |  | 154,215,000 |  |
Incurred but not paid workers' compensation liabilities |  |  |  |  |  |  |  |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Adjustments |  |  |  | 229,639,000 |  | 242,904,000 |  |  |  |  |
Accrued claims |  | $ 42,639,000 | $ 62,552,000 |  |  |  |  |  |  |  |
Present value discount, net of accretion |  | 740,000 | (3,643,000) |  |  |  |  |  |  |  |
Paid claims |  | (45,522,000) | (45,644,000) |  |  |  |  |  |  |  |
Ending balance |  | 240,761,000 | 242,904,000 |  |  |  |  |  |  |  |
Current portion of accrued claims |  |  |  |  | 45,522,000 | 49,295,000 |  |  |  |  |
Long-term portion of accrued claims |  |  |  |  | 195,239,000 | 193,609,000 |  |  |  |  |
Ending Balance |  | 240,761,000 | 242,904,000 |  | 240,761,000 | 242,904,000 |  |  |  |  |
Current portion of workers' compensation administrative fees accrued |  |  |  |  | 2,700,000 | 3,600,000 |  |  |  |  |
Undiscounted accrued workers' compensation costs |  | $ 257,900,000 | 262,900,000 |  |  |  |  |  |  |  |
Time period incurred claims expected to be paid recorded as restricted cash |  | 1 year |  |  |  |  |  |  |  |  |
Return Of Excess Claim Funds |  | $ 28,200,000 |  |  |  |  |  |  |  |  |
Deposits workers' compensation |  |  |  | 166,474,000 | $ 186,331,000 | 175,913,000 |  |  | $ 154,215,000 |  |
Time period estimate of incurred claim costs to be paid included in short term liabilities |  | 1 year |  |  |  |  |  |  |  |  |
Stock-Based Compensation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Number of stock-based employee compensation plans |  |  |  |  | 1 |  |  |  |  |  |
Percentage of annual grants issued to directors that are vested (in hundredths) |  | 100.00% |  |  |  |  |  |  |  |  |
Vesting period for officers and other management to be eligible for restricted stock grants, minimum |  | 3 years |  |  |  |  |  |  |  |  |
Percentage of grants issued to directors that are vested for annual award grants. |  | 100.00% |  |  |  |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of our health insurance coverage provided by United |  |  |  |  | 87.00% |  |  |  |  |  |
Corporate Employees [Member] |  |  |  |  |  |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage the entity matches of eligible corporate employees' contributions |  | 100.00% |  |  |  |  |  |  |  |  |
Percentage of eligible compensation matched, maximum |  | 6.00% |  |  |  |  |  |  |  |  |
Matching contributions to the plan |  | $ 12,600,000 | 11,400,000 | 10,300,000 |  |  |  |  |  |  |
Worksite Employees [Member] |  |  |  |  |  |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of eligible compensation matched, Minimum |  | 0.00% |  |  |  |  |  |  |  |  |
Percentage of eligible compensation matched, maximum |  | 6.00% |  |  |  |  |  |  |  |  |
Matching contributions to the plan |  | $ 199,200,000 | 198,200,000 | 165,500,000 |  |  |  |  |  |  |
Land [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Gross |  |  |  |  | $ 6,215,000 | 6,215,000 |  |  |  |  |
Building and Building Improvements [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Gross |  |  |  |  | 125,704,000 | 119,635,000 |  |  |  |  |
Building and Building Improvements [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives of property and equipment |  | 5 years |  |  |  |  |  |  |  |  |
Building and Building Improvements [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives of property and equipment |  | 32 years |  |  |  |  |  |  |  |  |
Computer hardware and software [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Gross |  |  |  |  | 129,213,000 | 123,232,000 |  |  |  |  |
Computer hardware and software [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives of property and equipment |  | 2 years |  |  |  |  |  |  |  |  |
Computer hardware and software [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives of property and equipment |  | 5 years |  |  |  |  |  |  |  |  |
Software Development Costs [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Gross |  |  |  |  | 100,762,000 | 85,252,000 |  |  |  |  |
Software Development Costs [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives of property and equipment |  | 3 years |  |  |  |  |  |  |  |  |
Software Development Costs [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives of property and equipment |  | 3 years |  |  |  |  |  |  |  |  |
Furniture, Fixtures and Other [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Gross |  |  |  |  | 48,516,000 | 48,082,000 |  |  |  |  |
Furniture, Fixtures and Other [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives of property and equipment |  | 5 years |  |  |  |  |  |  |  |  |
Furniture, Fixtures and Other [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives of property and equipment |  | 7 years |  |  |  |  |  |  |  |  |
Construction in Progress [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Gross | [2] |  |  |  | $ 84,668,000 | $ 20,885,000 |  |  |  |  |
Northeast [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues(1) |  | $ 1,189,837,000 | 1,135,771,000 | 996,541,000 |  |  |  |  |  |  |
Southeast [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues(1) |  | 509,846,000 | 499,201,000 | 447,584,000 |  |  |  |  |  |  |
Central [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues(1) |  | 761,905,000 | 743,514,000 | 637,779,000 |  |  |  |  |  |  |
Southwest [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues(1) |  | 935,634,000 | 1,001,845,000 | 895,243,000 |  |  |  |  |  |  |
West [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues(1) |  | 839,347,000 | 880,434,000 | 797,942,000 |  |  |  |  |  |  |
Other Revenues [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues(1) |  | $ 50,435,000 | $ 54,039,000 | $ 53,460,000 |  |  |  |  |  |  |
[1] | Revenues are comprised of gross billings less worksite employee (“WSEE”) payroll costs as follows:
| Year ended December 31,
(in thousands) | 2020 | 2019 | 2018
Gross billings | $ | 28,168,611 |  | $ | 27,212,010 |  | $ | 23,830,731 |
Less: WSEE payroll cost | 23,881,607 |  | 22,897,206 |  | 20,002,182 |
Revenues | $ | 4,287,004 |  | $ | 4,314,804 |  | $ | 3,828,549 |
[2] | Construction in progress is related to our corporate office expansion.

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- Definition The decrease or increase in workers' compensation claims cost estimates for changes in the actuarial assumptions resulting from changes in actual claims experience and other trends. + References No definition available. + Details
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- Definition Carrying value of amounts transferred to third party workers' compensation insurance providers for security purposes that are expected to be returned or applied towards payment after one year or beyond the operating cycle, if longer. + References No definition available. + Details
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- Definition The number of days in advance of the beginning of a reporting quarter that United Healthcare establishes cash funding rates. + References No definition available. + Details
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- Definition The percentage of grants issued to directors that are vested on the grant date for annual award grants. + References No definition available. + Details
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- Definition Percentage of our health insurance coverage provided by United + References No definition available. + Details
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- Definition The portion of insurance costs that is less than the agreed upon surplus included in accrued health insurance costs a current liability, as of the balance sheet date. + References No definition available. + Details
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- Definition Represents the amount required to be held on deposit with United, which is determined as approximately one day of claims funding activity. + References No definition available. + Details
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- Definition The amount of time a workers' compensation claim is expected to be paid recorded as restricted cash, in years. + References No definition available. + Details
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- Definition U.S. Treasury rates that correspond with the weighted average estimated claim payout period utilized to discount workers' compensation cost estimates. + References No definition available. + Details
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- Definition The liability as of the balance sheet date representing required funding mandated by statute or regulatory authority that is related directly or indirectly to underwriting activities, including pools for self-insurance and excluding premium taxes and income taxes. The funds derived from the assessments generally enable a government guarantor to pay insurance claims in the event that the underwriting insurer is insolvent or otherwise unable to meet its payment obligations. + References No definition available. + Details
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- Definition The change in worker's compensation reserve liability during the period resulting from the discount applied to reduce the reserve to present value. + References No definition available. + Details
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- Definition Carrying value, net of administrative fees, as of the balance sheet date of obligations and payables pertaining to claims incurred of a workers compensation nature. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References No definition available. + Details
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- Definition The maximum amount the Company will bear of the economic burden per policy year for those claims exceeding the first layer maximum per claim occurrence. + References No definition available. + Details
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