Segment Information (Summary of Segment Perfomance Measures by Segment) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Net sales	$ 131,674	$ 123,765	$ 265,174	$ 254,568
Gross profit	35,868	30,019	70,449	57,670
Income (loss) before income taxes	13,093	10,485	28,076	18,130
Operating Segments | Human Health
Segment Reporting Information [Line Items]
Net sales	59,045	55,424	116,526	104,503
Gross profit	21,738	16,331	42,047	30,872
Income (loss) before income taxes	10,794	6,972	21,297	12,429
Operating Segments | Pharmaceutical Ingredients
Segment Reporting Information [Line Items]
Net sales	34,295	32,579	72,655	70,556
Gross profit	6,108	6,926	12,222	13,076
Income (loss) before income taxes	1,682	2,327	3,781	3,860
Operating Segments | Performance Chemicals
Segment Reporting Information [Line Items]
Net sales	38,334	35,762	75,993	79,509
Gross profit	8,022	6,762	16,180	13,722
Income (loss) before income taxes	$ 3,260	$ 2,896	$ 6,804	$ 4,820
Unallocated Corporate
Segment Reporting Information [Line Items]
Net sales
Gross profit
Income (loss) before income taxes	$ (2,643)	$ (1,710)	$ (3,806)	$ (2,979)