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Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended
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Dec. 29, 2018 USD ($) shares | Dec. 30, 2017 USD ($) $ / shares shares | Dec. 31, 2016 shares
Significant Accounting Policies [Line Items] |  |  |
Number of reporting units | 2 |  |
Stock options excluded from calculation of diluted earnings per share, antidilutive | shares | 0 | 0 | 0
Dividends payable per share | $ / shares |  | $ 1.50 |
Dividend payable date |  | Jan. 26, 2018 |
Dividend record date |  | Jan. 12, 2018 |
Dividends payable |  | $ 62,985,000 |
Dividend declared date |  | Dec. 11, 2017 |
Accounting Standards Update 2014-09 | Retained Earnings |  |  |
Significant Accounting Policies [Line Items] |  |  |
Cumulative adjustment to retained earnings | $ 773,000 |  |
Buildings And Improvements |  |  |
Significant Accounting Policies [Line Items] |  |  |
Depreciated life | 30 years |  |
Trailing Equipment | Maximum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Depreciated life | 10 years |  |
Trailing Equipment | Minimum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Depreciated life | 7 years |  |
Hardware And Software | Maximum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Depreciated life | 7 years |  |
Hardware And Software | Minimum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Depreciated life | 3 years |  |
Commercial Trucking Claims | Maximum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Company retained liability per claim | $ 5,000,000 |  |
Commercial Trucking Claims | Maximum | 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 |  |
Commercial Trucking Claims | Maximum | Additional Retained Liability for Claims on or after May 1, 2017 through April 30, 2018 |  |  |
Significant Accounting Policies [Line Items] |  |  |
Company retained aggregate liability | 500,000 |  |
Commercial Trucking Claims | Maximum | Additional Retained Liability for Claims on or after May 1, 2018 through April 30, 2019 |  |  |
Significant Accounting Policies [Line Items] |  |  |
Company retained aggregate liability | 350,000 |  |
General Liability Claim | Maximum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Company retained liability per claim | 1,000,000 |  |
Workers' Compensation Claim | Maximum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Company retained liability per claim | 250,000 |  |
Cargo Claim | Maximum |  |  |
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://fasb.org/us-gaap/role/ref/legacyRef -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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