Segment Information (Summary of Segment Perfomance Measures by Segment) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Net sales	$ 125,552	$ 131,674	$ 253,570	$ 265,174
Gross profit	30,805	35,868	61,644	70,449
(Loss) income before income taxes	(934)	13,093	5,846	28,076
Operating Segments | Human Health
Segment Reporting Information [Line Items]
Net sales	53,981	59,045	101,870	116,526
Gross profit	16,919	21,738	31,124	42,047
(Loss) income before income taxes	4,933	10,794	8,905	21,297
Operating Segments | Pharmaceutical Ingredients
Segment Reporting Information [Line Items]
Net sales	36,816	34,295	77,432	72,655
Gross profit	5,658	6,108	12,612	12,222
(Loss) income before income taxes	1,196	1,682	4,263	3,781
Operating Segments | Performance Chemicals
Segment Reporting Information [Line Items]
Net sales	34,755	38,334	74,268	75,993
Gross profit	8,228	8,022	17,908	16,180
(Loss) income before income taxes	3,733	3,260	8,565	6,804
Unallocated Corporate
Segment Reporting Information [Line Items]
Net sales
Gross profit
(Loss) income before income taxes	$ (10,796)	$ (2,643)	$ (15,887)	$ (3,806)