Remaining Annual Amounts of Principal Payments of Credit Facility (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Jun. 30, 2016
Line Of Credit Facility [Line Items]
Year 1	$ 20,000
Year 2	20,000
Year 3	20,000
Year 4	22,566
Year 5	182,000
Total debt	264,566	$ 235,917
Term Loans
Line Of Credit Facility [Line Items]
Year 1	20,000
Year 2	20,000
Year 3	20,000
Year 4	20,000
Year 5	15,000
Total debt	95,000	45,000
Yen Line of Credit
Line Of Credit Facility [Line Items]
Year 4	2,566
Total debt	2,566	2,917
U.S. Dollar Line of Credit
Line Of Credit Facility [Line Items]
Year 5	167,000
Total debt	$ 167,000	$ 188,000