Schedule of Net Periodic Pension Costs (Detail) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Defined Benefit Plan Net Periodic Benefit Cost [Abstract]
Service cost	$ 683	$ 680
Interest cost	111	181
Expected return on plan assets	(280)	(270)
Net amortization	46	(361)
Net periodic pension costs	$ 560	$ 230