Employee Benefits - Additional Information Related to Participation in Individually Significant Multi-Employer Pension Plans (Details)	12 Months Ended
	Dec. 31, 2019
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Entity Tax Identification Number	48-0948788
Central States, Southeast and Southwest Areas Pension Fund
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Entity Tax Identification Number	36-6044243
Expiration Date of Collective-Bargaining Agreement	Mar. 31, 2024
Teamsters National 401 (k) Savings Plan
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Entity Tax Identification Number	52-1967784
Expiration Date of Collective-Bargaining Agreement	Mar. 31, 2024
Road Carriers Local 707 Pension Fund
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Entity Tax Identification Number	51-6106510
Expiration Date of Collective-Bargaining Agreement	Mar. 31, 2024
Teamsters Local 641 Pension Fund
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Entity Tax Identification Number	22-6220288
Expiration Date of Collective-Bargaining Agreement	Mar. 31, 2024