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Workers' Compensation Claims - Additional Information (Detail) - USD ($) | 9 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019 | Jun. 30, 2020 | Jun. 29, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Worker's compensation risk claim maximum | $ 3,000,000.0 |  |  |  |  |  |
Balance in Chubb trust accounts | 277,400,000 | $ 393,500,000 |  | $ 115,700,000 |  |  |
Collateral securities maintain to cover potential workers compensation claims losses | 59,700,000 | 76,100,000 |  |  |  |  |
Surety bonds and standby letters of credit | 59,700,000 |  |  |  |  |  |
Claim payments receivable from Chubb |  |  | $ 700,000 |  |  |  |
Estimated future liability for unsettled workers' compensation | 347,348,000 | 438,986,000 | $ 336,504,000 |  | $ 430,046,000 | $ 430,736,000 | $ 413,397,000
Reserves incurred in excess of retention limits | 4,800,000 | 3,300,000 |  |  |  |  |
Other Assets [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Accrual for costs incurred in excess of retention limits offset by a receivable | 4,800,000 | $ 3,300,000 |  |  |  |  |
Wells Fargo Bank, National Association [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Letter of credit | 63,700,000 |  |  |  |  |  |
Maryland [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Reinsurance coverage | 1,000,000.0 |  |  |  |  |  |
Colorado [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Reinsurance coverage | 2,000,000.0 |  |  |  |  |  |
California [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Surety bonds and standby letters of credit | $ 39,200,000 |  |  |  |  |  |

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