Components Included in Defined Benefit Pension Plan's Net Periodic Benefit Expense (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 22	$ 23	$ 66	$ 68
Expected return on plan assets	(3)	(10)	(8)	(30)
Net periodic expense	$ 19	$ 13	$ 58	$ 38