Components Included in Defined Benefit Pension Plan's Net Periodic Benefit Expense (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 22	$ 23	$ 44	$ 46
Expected return on plan assets	(3)	(10)	(5)	(20)
Net periodic expense	$ 19	$ 13	$ 39	$ 26