Schedule Of Components Of Deferred Taxes (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Schedule of Components of Deferred Tax Provision [Line Items]
Self-insurance reserves	$ 112,587	$ 115,201
Compensation accruals	47,571	49,717
State and foreign net operating loss carryforwards and other state and foreign deferred tax assets	54,874	52,506
Other currently non-deductible accrued liabilities	29,934	19,699
Net pension liability-OCI only	12,061	13,959
Doubtful accounts and other reserves	17,562	17,345
Other combined items-OCI only	15,282	17,684
Deferred income tax assets, Gross	289,871	286,111
Less: Valuation Allowance	(44,511)	(42,143)
Net deferred income tax assets:	245,360	243,968
Depreciable and amortizable assets	(322,317)	(342,655)
Other deferred tax liabilities	(2,329)	(2,581)
Net deferred income tax liabilities	$ (79,286)	$ (101,268)