Significant Accounting Policies - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended
	Dec. 28, 2013	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Significant Accounting Policies [Line Items]
Dividends per common share	$ 0.35	$ 0.35	$ 0.73	$ 0.21
Dividends payable	$ 15,921,000	$ 15,921,000
Dividend payable date		Jan. 16, 2014
Dividend record date		Dec. 27, 2013
Dividend declared date		Dec. 11, 2013
Stock options excluded from calculation of diluted earnings per share, antidilutive		143,000	321,000	220,244
Buildings And Improvements
Significant Accounting Policies [Line Items]
Depreciated life		Over 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	5,000,000
General Liability Claim
Significant Accounting Policies [Line Items]
Company retained liability per claim	1,000,000	1,000,000
Workers' Compensation Claim
Significant Accounting Policies [Line Items]
Company retained liability per claim	250,000	250,000
Cargo Claim
Significant Accounting Policies [Line Items]
Company retained liability per claim	$ 250,000	$ 250,000