Property and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Jun. 30, 2012
Cost:
Land	$ 7,511	$ 7,473
Buildings and improvements	133,042	123,257
Laboratory equipment	32,515	31,658
Office equipment	6,137	5,710
Property, Plant and Equipment, Gross, Total	179,205	168,098
Accumulated depreciation and amortization	(78,072)	(74,310)
Property and equipment, net	$ 101,133	$ 93,788