Significant Accounting Policies - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Dec. 25, 2010
Significant Accounting Policies [Line Items]
Stock options excluded from calculation of diluted earnings per share, antidilutive	321,000	220,244	1,349,313
Minimum
Significant Accounting Policies [Line Items]
Other intangible assets, estimated useful life	5 years
Maximum
Significant Accounting Policies [Line Items]
Other intangible assets, estimated useful life	10 years
Buildings And Improvements
Significant Accounting Policies [Line Items]
Depreciated life	30
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
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