Components of Deferred Taxes (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Self-insurance reserves	$ 88,401	$ 84,915
Compensation accruals	66,399	55,788
State and foreign net operating loss carryforwards and other state and foreign deferred tax assets	62,541	60,521
Other currently non-deductible accrued liabilities	17,213	16,739
Net pension liability—OCI only	10,929	11,746
Doubtful accounts and other reserves	29,616	18,428
Other combined items—OCI only	457	2,615
Deferred income tax assets, Gross	275,556	250,752
Less: Valuation Allowance	(52,567)	(52,764)
Net deferred income tax assets:	222,989	197,988
Depreciable and amortizable assets	(400,809)	(362,674)
Other deferred tax liabilities	(2,960)	(2,963)
Net deferred income tax liabilities	$ (180,780)	$ (167,649)