Commitments and Contingencies (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Increase (Decrease) in Liability for Claims and Claims Adjustment Expense Reserve	$ 7,500
Self-insurance limit on individual vehicle and general claims	7,500
Commitments to purchase trailers, vehicles and forklifts	6,376
Aggregate deductible for claims between $3,000 and $5,000 [Member]
Self-insurance retention liability additional deductible	6,000
Aggregate deductible for claims between $5,000 and $10,000 [Member]
Self-insurance retention liability additional deductible	2,500
Minimum [Member] | Aggregate deductible for claims between $3,000 and $5,000 [Member]
Self-insurance retention liability additonal deductible applicable range	3,000
Minimum [Member] | Aggregate deductible for claims between $5,000 and $10,000 [Member]
Self-insurance retention liability additonal deductible applicable range	5,000
Maximum [Member] | Aggregate deductible for claims between $3,000 and $5,000 [Member]
Self-insurance retention liability additonal deductible applicable range	5,000
Maximum [Member] | Aggregate deductible for claims between $5,000 and $10,000 [Member]
Self-insurance retention liability additonal deductible applicable range	$ 10,000