Income Taxes - Significant Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Jan. 02, 2016
Deferred tax assets:
Allowance for doubtful accounts	$ 10,552	$ 9,368
Accrued employee benefits	35,020	33,232
Restructuring reserves	14,885	52,548
Workers’ compensation, general and fleet liabilities	61,118	64,936
Deferred income	470	211
Deferred financing costs	5,379	7,751
Pension liability	51,618	33,576
Net operating loss carryforwards	162,511	129,973
Other accrued expenses	30,429	25,941
Total gross deferred tax assets	371,982	357,536
Less valuation allowance	(24,274)	(151,792)
Total net deferred tax assets	347,708	205,744
Deferred tax liabilities:
Property and equipment	(216,556)	(152,181)
Inventories	(41,765)	(22,057)
Intangibles	(435,817)	(487,300)
Total deferred tax liabilities	(694,138)	(661,538)
Net deferred tax liability	$ (346,430)	$ (455,794)