Segment Information (Summary of Segment Perfomance Measures by Segment) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting Information [Line Items]
Net sales	$ 133,500	$ 130,803
Gross profit	34,581	27,651
Income (loss) before income taxes	14,983	7,645
Operating Segments | Human Health
Segment Reporting Information [Line Items]
Net sales	57,481	49,079
Gross profit	20,309	14,541
Income (loss) before income taxes	10,503	5,457
Operating Segments | Pharmaceutical Ingredients
Segment Reporting Information [Line Items]
Net sales	38,360	37,977
Gross profit	6,114	6,150
Income (loss) before income taxes	2,099	1,533
Operating Segments | Performance Chemicals
Segment Reporting Information [Line Items]
Net sales	37,659	43,747
Gross profit	8,158	6,960
Income (loss) before income taxes	$ 3,544	$ 1,924
Unallocated Corporate
Segment Reporting Information [Line Items]
Net sales
Gross profit
Income (loss) before income taxes	$ (1,163)	$ (1,269)