Components of Deferred Taxes (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Self-insurance reserves	$ 68,402	$ 64,181
Compensation accruals	74,124	63,021
Doubtful accounts and other reserves	27,184	20,809
Other currently non-deductible accrued liabilities	35,253	19,759
State and foreign net operating loss carryforwards and other state and foreign deferred tax assets	86,315	76,439
Net pension liabilities – OCI only	4,475	2,825
Deferred income tax assets, Gross	295,753	247,034
Valuation Allowance	(79,264)	(70,227)
Total deferred income taxes	216,489	176,807
Depreciable and amortizable assets	257,896	226,389
Other combined items – OCI only	929	550
Other liabilities	2,045	1,824
Deferred income tax liabilities, Gross	$ 260,870	$ 228,763