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Significant Accounting Policies - Additional Information (Detail) - USD ($) | 12 Months Ended
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Dec. 26, 2015 | Dec. 27, 2014 | Dec. 28, 2013
Significant Accounting Policies [Line Items] |  |  |
Stock options excluded from calculation of diluted earnings per share, antidilutive | 0 | 0 | 143,000
Dividends payable per share |  | $ 1.00 |
Dividend payable date |  | Jan. 26, 2015 |
Dividend record date |  | Jan. 12, 2015 |
Dividends payable |  | $ 44,794,000 |
Dividend declared date |  | Dec. 04, 2014 |
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 |  |
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 |  |

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Diluted Earnings Per Share -URI http://asc.fasb.org/extlink&oid=6510752 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Stock Agreement -URI http://asc.fasb.org/extlink&oid=6508534 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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