Significant Accounting Policies - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014
Significant Accounting Policies [Line Items]
Stock options excluded from calculation of diluted earnings per share, antidilutive	0	0	0
Buildings And Improvements
Significant Accounting Policies [Line Items]
Depreciated life	30 years
Trailing Equipment | Minimum
Significant Accounting Policies [Line Items]
Depreciated life	7 years
Trailing Equipment | Maximum
Significant Accounting Policies [Line Items]
Depreciated life	10 years
Hardware And Software | Minimum
Significant Accounting Policies [Line Items]
Depreciated life	3 years
Hardware And Software | Maximum
Significant Accounting Policies [Line Items]
Depreciated life	7 years
Commercial Trucking Claims
Significant Accounting Policies [Line Items]
Company retained liability per claim	$ 5,000,000
Commercial Trucking Claims | Additional Retained Liability for Claims on or after May 1, 2016 through April 30, 2017
Significant Accounting Policies [Line Items]
Company retained aggregate liability	700,000
General Liability Claim
Significant Accounting Policies [Line Items]
Company retained liability per claim	1,000,000
Workers' Compensation Claim
Significant Accounting Policies [Line Items]
Company retained liability per claim	250,000
Cargo Claim
Significant Accounting Policies [Line Items]
Company retained liability per claim	$ 250,000