Significant Accounting Policies - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 1,045,040,000	$ 1,182,786,000	$ 2,078,040,000	$ 2,230,712,000
BCO Independent Contractor
Disaggregation of Revenue [Line Items]
Consolidated revenue, percentage	45.00%	45.00%	44.00%	45.00%
Truck Brokerage Carriers
Disaggregation of Revenue [Line Items]
Consolidated revenue, percentage	47.00%	49.00%	48.00%	49.00%
Railroads
Disaggregation of Revenue [Line Items]
Consolidated revenue, percentage	3.00%	3.00%	3.00%	3.00%
Air and Ocean Cargo Carriers
Disaggregation of Revenue [Line Items]
Consolidated revenue, percentage	3.00%	2.00%	3.00%	2.00%
BCO Independent Contractor and Truck Brokerage Carriers | Van Equipment
Disaggregation of Revenue [Line Items]
Revenue	$ 605,365,000	$ 713,341,000	$ 1,224,379,000	$ 1,369,476,000
BCO Independent Contractor and Truck Brokerage Carriers | Unsided/Platform Equipment
Disaggregation of Revenue [Line Items]
Revenue	338,107,000	364,676,000	648,828,000	664,045,000
BCO Independent Contractor and Truck Brokerage Carriers | Less than Truckload
Disaggregation of Revenue [Line Items]
Revenue	$ 24,732,000	$ 27,364,000	$ 48,108,000	$ 50,948,000