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Workers' Compensation Claims - Additional Information (Detail) - USD ($) | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Worker's compensation risk claim maximum | $ 5,000,000 |  |  |  |  |
Surety bonds | 15,000,000 |  |  |  |  |
Balance in Chubb trust accounts | 380,600,000 | $ 451,000,000 |  |  |  |
Collateral securities maintain to cover potential workers compensation claims losses | 74,800,000 | 85,200,000 |  |  |  |
Surety bonds and standby letters of credit | 74,800,000 |  |  |  |  |
Estimated future liability for unsettled workers' compensation | 430,046,000 | 413,397,000 | $ 430,736,000 | $ 398,838,000 | $ 390,814,000 | $ 363,517,000
Reserves incurred in excess of retention limits | 3,000,000 | 3,200,000 |  |  |  |
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 | 3,000,000 | $ 3,200,000 |  |  |  |
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 |  |  |  |  |
Colorado [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Reinsurance coverage | 2,000,000 |  |  |  |  |
California [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Surety bonds and standby letters of credit | $ 55,600,000 |  |  |  |  |

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