Segment Information (Schedule of Segment Perfomance Measures by Segment) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Net sales	$ 116,508	$ 113,956	$ 245,769	$ 225,704
Gross profit	26,984	20,708	60,718	42,213
Income (loss) before income taxes	10,730	7,098	28,304	14,720
Operating Segments [Member] | Human Health [Member]
Segment Reporting Information [Line Items]
Net sales	39,817	29,851	78,511	56,260
Gross profit	13,027	8,907	24,168	17,010
Income (loss) before income taxes	6,192	4,252	11,727	7,371
Operating Segments [Member] | Pharmaceutical Ingredients [Member]
Segment Reporting Information [Line Items]
Net sales	37,479	39,785	85,903	80,393
Gross profit	7,773	5,471	23,035	12,047
Income (loss) before income taxes	3,526	1,085	14,530	3,638
Operating Segments [Member] | Performance Chemicals [Member]
Segment Reporting Information [Line Items]
Net sales	39,212	44,320	81,355	89,051
Gross profit	6,184	6,330	13,515	13,156
Income (loss) before income taxes	2,151	2,296	5,453	5,381
Unallocated Corporate [Member]
Segment Reporting Information [Line Items]
Income (loss) before income taxes	$ (1,139)	$ (535)	$ (3,406)	$ (1,670)