Acquisitions - Consideration Paid and Amortization Expense (Details) - USD ($) $ in Thousands			12 Months Ended
	Jun. 26, 2020	May 06, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Oct. 22, 2020
Recognized amounts of identifiable assets acquired:
Property and equipment — tractors and trailers			$ 12,382	$ 5,008	$ 35,743
Victoria Express Pipeline, LLC (VEX) and EnLink Midstream Operating, L.P.
Estimated fair value of the assets acquired:
Accounts receivable and other current assets						$ 80
Linefill and base gas						1,013
Property and equipment — Pipeline and related terminal facilities						20,542
Accounts payable and other accrued liabilities						(598)
Total purchase price						$ 21,037
Comcar
Estimated fair value of the assets acquired:
Property and equipment — tractors and trailers	$ 5,901
Materials and supplies	87
Intangible assets — customer relationships	3,175
Total purchase price	9,163
Consideration:
Fair value of total consideration transferred	$ 9,000
EH Trucking
Consideration:
Cash		$ 5,624
Value of AE common shares issued		392
Contingent consideration arrangement		431
Fair value of total consideration transferred		6,447
Recognized amounts of identifiable assets acquired:
Property and equipment — tractors and trailers		4,576
Shop, office and telecommunication equipment		20
Intangible assets — customer relationships		1,851
Total purchase price		$ 6,447