Segment Reporting (Details) $ in Thousands	3 Months Ended			6 Months Ended	9 Months Ended
	Sep. 30, 2019 USD ($)	Mar. 31, 2019 Segment	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) Segment	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | Segment		3		4
Schedule of financial data of reportable segments
Revenues	$ 459,147		$ 536,584		$ 1,446,983	$ 1,664,594
Operating Income	(92,825)		(10,821)		(251,442)	(35,626)
Interest expense:	5,480		35,798		13,994	79,573
Loss on debt restructuring	0		0		2,270	0
Income before provision for income taxes	(98,305)		(46,619)		(267,706)	(115,199)
Depreciation and amortization	15,471		9,614		45,801	27,803
Capital expenditures, cash and non-cash	10,034		20,197		77,720	42,032
Total assets	793,204			$ 793,204	793,204		$ 853,457
Operating Segments | Ascent
Schedule of financial data of reportable segments
Revenues	125,900		145,632		387,753	425,205
Operating Income	(29,059)		7,474		(17,807)	21,495
Depreciation and amortization	1,590		1,183		4,888	3,539
Capital expenditures, cash and non-cash	66		496		2,116	1,205
Total assets	262,886			262,886	262,886		276,994
Operating Segments | Active On-Demand
Schedule of financial data of reportable segments
Revenues	108,274		146,217		352,537	505,753
Operating Income	202		5,634		785	19,895
Depreciation and amortization	2,143		2,069		6,364	6,099
Capital expenditures, cash and non-cash	1,084		1,597		3,399	4,026
Total assets	97,006			97,006	97,006		136,795
Operating Segments | LTL [Member]
Schedule of financial data of reportable segments
Revenues	107,276		113,948		327,174	344,237
Operating Income	(12,725)		(5,040)		(22,999)	(17,467)
Depreciation and amortization	1,880		876		3,603	2,689
Capital expenditures, cash and non-cash	331		505		5,351	760
Total assets	113,083			113,083	113,083		73,706
Operating Segments | TL
Schedule of financial data of reportable segments
Revenues	127,196		140,663		405,679	430,981
Operating Income	(30,144)		(6,421)		(140,567)	(17,032)
Depreciation and amortization	7,022		4,387		23,144	12,894
Capital expenditures, cash and non-cash	678		880		8,984	4,388
Total assets	165,812			165,812	165,812		244,760
Eliminations
Schedule of financial data of reportable segments
Revenues	(9,499)		(9,876)		(26,160)	(41,582)
Total assets	(1,883)			(1,883)	(1,883)		(2,719)
Corporate
Schedule of financial data of reportable segments
Operating Income	(21,099)		(12,468)		(70,854)	(42,517)
Depreciation and amortization	2,836		1,099		7,802	2,582
Capital expenditures, cash and non-cash	7,875		$ 16,719		57,870	$ 31,653
Total assets	$ 156,300			$ 156,300	$ 156,300		$ 123,921
Rolling Stock Assets [Member] | Ascent
Schedule of financial data of reportable segments
Percent of assets leased	1.00%			1.00%	1.00%
Rolling Stock Assets [Member] | LTL [Member]
Schedule of financial data of reportable segments
Percent of assets leased	38.00%			38.00%	38.00%
Rolling Stock Assets [Member] | TL
Schedule of financial data of reportable segments
Percent of assets leased	61.00%			61.00%	61.00%
Rolling Stock Assets [Member] | Corporate
Schedule of financial data of reportable segments
Capital expenditures, cash and non-cash					$ 45,600