Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 26, 2015	Dec. 27, 2014	Dec. 28, 2013
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	$ 364,366	$ 356,041	$ 351,726
Additions Charged to Income	301,597	325,766	332,922
Deductions From Reserves	315,624	317,441	328,607
Balance at End of Year	350,339	364,366	356,041
Self-Insurance Reserves, Current
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	151,153	150,860	138,998
Additions Charged to Income	300,336	317,734	332,922
Deductions From Reserves	315,624	317,441	321,060
Balance at End of Year	135,865	151,153	150,860
Self-Insurance Reserves, Noncurrent
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	213,213	205,181	212,728
Additions Charged to Income	1,261	8,032	0
Deductions From Reserves	0	0	7,547
Balance at End of Year	$ 214,474	$ 213,213	$ 205,181