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Workers' Compensation Claims - Additional Information (Detail) - USD ($) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jul. 01, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Worker's compensation risk claim maximum | $ 5,000,000 | $ 5,000,000 |  |  |
Surety bonds | 30,000,000 |  |  |  |
Balance in Chubb trust accounts |  | 451,000,000 | $ 380,600,000 |  |
Specified investment balances or other financial instruments |  | 85,200,000 | 96,800,000 |  |
Surety bonds and standby letters of credit |  | 85,200,000 |  |  |
Estimated future liability for unsettled workers' compensation |  | 413,397,000 | 363,517,000 | $ 312,537,000 | $ 255,675,000
Reserves incurred in excess of retention limits |  | 3,200,000 | 3,000,000 |  |
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 |  | 3,200,000 | $ 3,000,000 |  |
Wells Fargo Bank, National Association [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Letter of credit | $ 63,700,000 |  |  |  |
Chubb Limited [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Worker's compensation risk claim maximum |  | 5,000,000 |  |  |
Maryland [Member] | AICE [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Reinsurance coverage |  | 1,000,000 |  |  |
Colorado [Member] | AICE [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Reinsurance coverage |  | $ 2,000,000 |  |  |
Colorado [Member] | Chubb Limited [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Excess workers' compensation insurance coverage with American Insurance Company |  | statutory limits |  |  |
California [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Surety bonds and standby letters of credit |  | $ 70,600,000 |  |  |
Maximum [Member] | AICE [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Reinsurance coverage |  | 5,000,000 |  |  |
Minimum [Member] | Chubb Limited [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Excess workers' compensation insurance coverage with Chubb |  | 5,000,000 |  |  |
Minimum [Member] | Maryland [Member] | Chubb Limited [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Excess workers' compensation insurance coverage with Chubb |  | 1,000,000 |  |  |
Minimum [Member] | Colorado [Member] | Chubb Limited [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Excess workers' compensation insurance coverage with Chubb |  | $ 2,000,000 |  |  |

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