Nature of Business and Summary of Significant Accounting Policies - Intangible Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Jun. 30, 2016
Intangible Assets by Major Class [Line Items]
Finite-lived intangible assets, Cost	$ 15,700	$ 15,700
Finite-lived intangible assets, Accumulated amortization	(7,563)	(7,343)
Finite-lived intangible assets, Net book value	8,137	8,357
Customer relationships [Member]
Intangible Assets by Major Class [Line Items]
Finite-lived intangible assets, Cost	9,800	9,800
Finite-lived intangible assets, Accumulated amortization	(7,563)	(7,343)
Finite-lived intangible assets, Net book value	2,237	2,457
Trade Name [Member]
Intangible Assets by Major Class [Line Items]
Finite-lived intangible assets, Cost	5,900	5,900
Finite-lived intangible assets, Accumulated amortization	0	0
Finite-lived intangible assets, Net book value	$ 5,900	$ 5,900