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Intangible Assets Including Goodwill - Carrying Value of Goodwill By Segment (Details) $ in Thousands	3 Months Ended
	Sep. 30, 2020 USD ($)
Goodwill [Line Items]
Goodwill	$ 60,437
Goodwill [Roll Forward]
Net balance at June 30, 2019	60,369
Translation adjustment	68
Net balance at September 30, 2020	60,437
Utility and Power Infrastructure [Member]
Goodwill [Line Items]
Goodwill	6,926
Goodwill [Roll Forward]
Net balance at June 30, 2019	6,905
Translation adjustment	21
Net balance at September 30, 2020	6,926
Process and Industrial Facilities
Goodwill [Line Items]
Goodwill	26,853
Goodwill [Roll Forward]
Net balance at June 30, 2019	26,846
Translation adjustment	7
Net balance at September 30, 2020	26,853
Storage and Terminal Solutions
Goodwill [Line Items]
Goodwill	26,658
Goodwill [Roll Forward]
Net balance at June 30, 2019	26,618
Translation adjustment	40
Net balance at September 30, 2020	$ 26,658

X

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(10)(1))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

+ Details

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X

- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267

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X

- Definition

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

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+ References

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