Deferred Compensation Plans - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 29, 2018	Jun. 30, 2017	Jun. 29, 2018	Jun. 30, 2017	Dec. 29, 2017
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Trading securities	$ 58,487,000		$ 58,487,000		$ 53,350,000
Deferred compensation plan vested amounts due	62,196,000		62,196,000		$ 59,050,000
Change in market value of trust assets	$ 1,043,000	$ 1,020,000	$ 737,000	$ 2,917,000
Maximum
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Percentage of compensation deferred			100.00%