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Workers' Compensation Claims - Additional Information (Detail) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Jun. 29, 2020	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Worker's compensation risk claim maximum	$ 5,000,000.0	$ 3,000,000.0
Balance in Chubb trust accounts		290,700,000	$ 393,500,000	$ 115,700,000
Collateral securities maintain to cover potential workers compensation claims losses		60,100,000	76,100,000
Surety bonds and standby letters of credit		60,100,000
Estimated future liability for unsettled workers' compensation		357,746,000	438,986,000		$ 413,397,000	$ 363,517,000
Reserves incurred in excess of retention limits		2,900,000	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		2,900,000	$ 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	1,000,000.0
Colorado [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reinsurance coverage	$ 2,000,000.0	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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