Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

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- Definition

Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

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- Definition

Number of reporting units tested for impairment of goodwill. A reporting unit is an operating segment or one level below an operating segment.

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(Goodwill acquired in business combination by reportable segment) (Details)	3 Months Ended
	Mar. 31, 2019 USD ($) Units	Dec. 31, 2018 USD ($)	Jul. 01, 2018 USD ($)
Goodwill [Line Items]
Number of reporting units \| Units	4
Goodwill, Impaired, Accumulated Impairment Loss	$ 376,483,000
Rollforward of goodwill by reportable segment
Goodwill	$ 264,826,000	$ 264,826,000
TES [Member]
Goodwill [Line Items]
Number of reporting units \| Units	1
Goodwill, Impaired, Accumulated Impairment Loss	$ 132,408,000
Rollforward of goodwill by reportable segment
Goodwill	$ 92,926,000
LTL [Member]
Goodwill [Line Items]
Number of reporting units \| Units	1
Goodwill, Impaired, Accumulated Impairment Loss	$ 197,312,000
Rollforward of goodwill by reportable segment
Goodwill	$ 0		$ 0
Ascent [Member]
Goodwill [Line Items]
Number of reporting units \| Units	2
Goodwill, Impaired, Accumulated Impairment Loss	$ 46,763,000
Rollforward of goodwill by reportable segment
Goodwill	$ 171,900,000