Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Jun. 30, 2021
Segment Reporting Information [Line Items]
Gross revenues	$ 170,726	$ 184,995
Revenue	168,093	182,771
Gross profit (loss)	(3,508)	14,350
Selling, general and administrative expenses	16,629	18,128
Restructuring costs	605	(320)
Operating income (loss)	(20,742)	(3,458)
Segment assets	450,277		$ 467,556
Utility and Power Infrastructure [Member]
Segment Reporting Information [Line Items]
Gross revenues	57,204	60,671
Revenue	57,204	60,671
Gross profit (loss)	(6,107)	6,913
Selling, general and administrative expenses	3,050	2,222
Restructuring costs	9	11
Operating income (loss)	(9,166)	4,680
Segment assets	107,077		81,717
Process and Industrial Facilities
Segment Reporting Information [Line Items]
Gross revenues	45,210	46,728
Revenue	43,905	45,931
Gross profit (loss)	2,871	3,659
Selling, general and administrative expenses	2,762	4,050
Restructuring costs	7	(500)
Operating income (loss)	102	109
Segment assets	80,315		106,619
Storage and Terminal Solutions
Segment Reporting Information [Line Items]
Gross revenues	68,312	77,596
Revenue	66,984	76,169
Gross profit (loss)	413	3,778
Selling, general and administrative expenses	4,506	5,143
Restructuring costs	(33)	13
Operating income (loss)	(4,060)	(1,378)
Segment assets	155,730		160,782
Corporate [Member]
Segment Reporting Information [Line Items]
Gross profit (loss)	(685)	0
Selling, general and administrative expenses	6,311	6,713
Restructuring costs	622	156
Operating income (loss)	(7,618)	(6,869)
Segment assets	107,155		$ 118,438
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Gross revenues	2,633	2,224
Intersegment Eliminations [Member] | Process and Industrial Facilities
Segment Reporting Information [Line Items]
Gross revenues	1,305	797
Intersegment Eliminations [Member] | Storage and Terminal Solutions
Segment Reporting Information [Line Items]
Gross revenues	$ 1,328	$ 1,427