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Workers' Compensation Claims - Additional Information (Detail) - USD ($)		3 Months Ended	12 Months Ended
	Jul. 01, 2018	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
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		462,200,000	$ 451,000,000
Specified investment balances or other financial instruments		85,200,000	85,200,000
Surety bonds and standby letters of credit		85,200,000
Estimated future liability for unsettled workers' compensation		422,872,000	413,397,000	$ 378,874,000	$ 363,517,000
Reserves incurred in excess of retention limits		3,200,000	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		3,200,000	$ 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
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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