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Significant Accounting Policies - Additional Information (Detail) | 3 Months Ended | 12 Months Ended
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Dec. 28, 2019 USD ($) $ / shares | Sep. 28, 2019 USD ($) | Jun. 29, 2019 USD ($) | Mar. 30, 2019 USD ($) | Dec. 29, 2018 USD ($) | Sep. 29, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 29, 2019 Segment | Dec. 28, 2019 USD ($) $ / shares shares | Dec. 29, 2018 USD ($) shares | Dec. 30, 2017 USD ($) shares
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of reporting units | Segment |  |  |  |  |  |  |  |  | 2 |  |  |
Stock options excluded from calculation of diluted earnings per share, antidilutive | shares |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Dividends payable per share | $ / shares | $ 2.00 |  |  |  |  |  |  |  |  | $ 2.00 |  |
Dividend payable date |  |  |  |  |  |  |  |  |  | Jan. 24, 2020 |  |
Dividend record date |  |  |  |  |  |  |  |  |  | Jan. 10, 2020 |  |
Dividends payable | $ 78,947,000 |  |  |  |  |  |  |  |  | $ 78,947,000 |  |
Dividend announced date |  |  |  |  |  |  |  |  |  | Dec. 10, 2019 |  |
Revenue | 994,879,000 | $ 1,011,658,000 | $ 1,045,040,000 | $ 1,033,000,000 | $ 1,182,351,000 | $ 1,202,081,000 | $ 1,182,786,000 | $ 1,047,926,000 |  | $ 4,084,577,000 | $ 4,615,144,000 | $ 3,646,364,000
BCO Independent Contractor |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Consolidated revenue, percentage |  |  |  |  |  |  |  |  |  | 45.00% | 43.00% | 45.00%
Truck Brokerage Carriers |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Consolidated revenue, percentage |  |  |  |  |  |  |  |  |  | 47.00% | 49.00% | 48.00%
Railroads |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Consolidated revenue, percentage |  |  |  |  |  |  |  |  |  | 3.00% | 3.00% | 3.00%
Air and Ocean Cargo Carriers |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Consolidated revenue, percentage |  |  |  |  |  |  |  |  |  | 3.00% | 3.00% | 3.00%
BCO Independent Contractor and Truck Brokerage Carriers | Van Equipment |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | $ 2,371,188,000 | $ 2,791,494,000 | $ 2,163,832,000
BCO Independent Contractor and Truck Brokerage Carriers | Unsided/Platform Equipment |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 1,295,817,000 | 1,386,387,000 | 1,134,660,000
BCO Independent Contractor and Truck Brokerage Carriers | Less than Truckload |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | $ 98,324,000 | 102,531,000 | $ 89,041,000
Accounting Standards Update 2014-09 | Retained Earnings |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cumulative adjustment to retained earnings |  |  |  |  | $ 773,000 |  |  |  |  |  | $ 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 |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Company retained aggregate liability | 10,000,000 |  |  |  |  |  |  |  |  | $ 10,000,000 |  |
Self insurance excess value maintain third party | 5,000,000 |  |  |  |  |  |  |  |  | 5,000,000 |  |
Commercial Trucking Claims | Initial Excess Policy [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Company retained liability per claim | 5,000,000 |  |  |  |  |  |  |  |  | 5,000,000 |  |
Company retained aggregate liability | 10,000,000 |  |  |  |  |  |  |  |  | 10,000,000 |  |
Additional premium | 3,500,000 |  |  |  |  |  |  |  |  | 3,500,000 |  |
Commercial Trucking Claims | Third Party Insurance [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Self insurance excess value maintain third party | 10,000,000 |  |  |  |  |  |  |  |  | 10,000,000 |  |
Commercial Trucking Claims | Additional Retained Liability For Claims Three [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Company retained liability per claim | 5,000,000 |  |  |  |  |  |  |  |  | 5,000,000 |  |
Additional premium | 3,500,000 |  |  |  |  |  |  |  |  | 3,500,000 |  |
Commercial Trucking Claims | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Company retained liability per claim | 10,000,000 |  |  |  |  |  |  |  |  | 10,000,000 |  |
Commercial Trucking Claims | Maximum | Initial Excess Policy [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Company retained aggregate liability | 10,000,000 |  |  |  |  |  |  |  |  | 10,000,000 |  |
Commercial Trucking Claims | Maximum | Additional Retained Liability, Maximum in Aggregate, for three year policy that goes May 1, 2019 through April 30, 2022 |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Company retained term aggregate | 15,000,000 |  |  |  |  |  |  |  |  | 15,000,000 |  |
Commercial Trucking Claims | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Company retained liability per claim | 5,000,000 |  |  |  |  |  |  |  |  | 5,000,000 |  |
Commercial Trucking Claims | Minimum | Initial Excess Policy [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Company retained aggregate liability | 5,000,000 |  |  |  |  |  |  |  |  | 5,000,000 |  |
Commercial Trucking Claims | Minimum | Third Party Insurance [Member] |  |  |  |  |  |  |  |  |  |  |  |
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 |  |
Workers' Compensation Claim | BCO Independent Contractor |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Company retained liability per claim | 750,000 |  |  |  |  |  |  |  |  | 750,000 |  |
Cargo Claim |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Company retained liability per claim | 250,000 |  |  |  |  |  |  |  |  | 250,000 |  |
Occupational Reinsurance Claims One [Member] | BCO Independent Contractor |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Company retained liability per claim | 500,000 |  |  |  |  |  |  |  |  | 500,000 |  |
Occupational Reinsurance Claims Two [Member] | BCO Independent Contractor |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Company retained liability per claim | 1,000,000 |  |  |  |  |  |  |  |  | 1,000,000 |  |
Occupational Reinsurance Claims Three [Member] | BCO Independent Contractor |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Company retained liability per claim | $ 2,000,000 |  |  |  |  |  |  |  |  | $ 2,000,000 |  |

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