Schedule of Net Periodic Pension Costs (Detail) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Defined Benefit Plan Net Periodic Benefit Cost [Abstract]
Service cost	$ 897	$ 683
Interest cost	40	111
Expected return on plan assets	(181)	(280)
Net amortization	(164)	46
Net periodic pension costs	$ 592	$ 560