Operating Segment, Geographic Information and Significant Customers - Summary of Performance of Operations by Reportable Segment (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	$ 64,119	$ 59,578	$ 57,089	$ 54,061	$ 53,678	$ 53,393	$ 50,932	$ 50,726	$ 234,847	$ 208,729	$ 194,231
Adjusted EBITDA									44,414	23,522	9,940
MCE
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues									207,104	175,766	152,606
MDS
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues									27,411	34,217	41,491
Segment Reconciling Items [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues									332	(1,254)	134
Intersegment Eliminations [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues									(5,670)	(9,032)	(13,744)
Intersegment Eliminations [Member] | MCE
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues									(5,356)	(9,032)	(13,744)
Intersegment Eliminations [Member] | MDS
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues									314	0	0
Operating Segments [Member] | MCE
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues									212,460	184,798	166,350
Adjusted EBITDA									40,321	18,495	2,812
Operating Segments [Member] | MDS
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues									27,725	34,217	41,491
Adjusted EBITDA									3,397	5,727	7,097
Segment Reconciling Items and Intersegment Eliminations [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues									(5,338)	(10,286)	(13,610)
Adjusted EBITDA									$ 696	$ (700)	$ 31