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Workers' Compensation Claims - Additional Information (Detail) - USD ($) |  | 6 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 01, 2020 | Jun. 30, 2020 | Dec. 31, 2019 | Jun. 29, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Worker's compensation risk claim maximum |  | $ 5,000,000.0 |  |  |  |  |  |
Balance in Chubb trust accounts |  | 264,600,000 | $ 393,500,000 | $ 115,700,000 |  |  |  |
Collateral securities maintain to cover potential workers compensation claims losses |  | 59,700,000 | 59,700,000 |  |  |  |  |
Surety bonds and standby letters of credit |  | 59,700,000 |  |  |  |  |  |
Claim payments receivable from Chubb |  | 2,200,000 |  |  |  |  |  |
Estimated future liability for unsettled workers' compensation |  | 336,504,000 | 438,986,000 |  | $ 445,310,000 | $ 430,736,000 | $ 422,872,000 | $ 413,397,000
Reserves incurred in excess of retention limits |  | 3,400,000 | 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 |  | 3,400,000 | $ 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 |  |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Worker's compensation risk claim maximum | $ 3,000,000.0 |  |  |  |  |  |  |
Maryland [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Reinsurance coverage |  | 1,000,000.0 |  |  |  |  |  |
Maryland [Member] | Subsequent Event [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 |  |  |  |  |  |
Colorado [Member] | Subsequent Event [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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