Components of Deferred Taxes (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Self-insurance reserves	$ 75,648	$ 69,217
Compensation accruals	71,054	70,680
Doubtful accounts and other reserves	94,295	77,665
Other currently non-deductible accrued liabilities	61,634	36,500
Operating lease liabilities	89,865	76,164
State and foreign net operating loss carryforwards and other state and foreign deferred tax assets	81,036	87,662
Net pension liabilities – OCI only	1,356	2,427
Deferred income tax assets, Gross	474,888	420,315
Valuation Allowance	(68,003)	(75,277)
Total deferred income taxes	406,885	345,038
Depreciable and amortizable assets	296,588	275,901
Right of use assets-operating leases	89,493	76,164
Other liabilities	3,697	1,855
Deferred income tax liabilities, Gross	$ 389,778	$ 353,920