Intangible Assets Including Goodwill - Carrying Value of Goodwill By Segment (Details) $ in Thousands	6 Months Ended
	Dec. 31, 2021 USD ($)
Goodwill [Line Items]
Goodwill	$ 60,546
Goodwill [Roll Forward]
Net balance at June 30, 2021	60,636
Translation adjustment	(90)
Net balance at December 31, 2021	60,546
Utility and Power Infrastructure
Goodwill [Line Items]
Goodwill	6,956
Goodwill [Roll Forward]
Net balance at June 30, 2021	6,984
Translation adjustment	(28)
Net balance at December 31, 2021	6,956
Process and Industrial Facilities
Goodwill [Line Items]
Goodwill	26,871
Goodwill [Roll Forward]
Net balance at June 30, 2021	26,878
Translation adjustment	(7)
Net balance at December 31, 2021	26,871
Storage and Terminal Solutions
Goodwill [Line Items]
Goodwill	26,719
Goodwill [Roll Forward]
Net balance at June 30, 2021	26,774
Translation adjustment	(55)
Net balance at December 31, 2021	$ 26,719