Segment Information about Reported Product Revenues and Operating Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Segment Reporting Information [Line Items]
Product revenues	$ 171,182	$ 141,058	$ 479,792	$ 406,737
Depreciation and amortization	7,737	7,445	23,467	22,737
Operating income (loss)	14,554	10,038	32,764	27,089
CCS
Segment Reporting Information [Line Items]
Product revenues	37,697	33,966	103,460	96,117
Depreciation and amortization	437	329	1,115	787
Operating income (loss)	11,152	9,328	28,953	25,037
Advanced Technology
Segment Reporting Information [Line Items]
Depreciation and amortization	117	82	344	388
Operating income (loss)	(1,544)	(1,631)	(5,174)	(5,260)
W.E.T.
Segment Reporting Information [Line Items]
Product revenues	133,485	107,092	376,332	310,620
Depreciation and amortization	6,870	6,692	21,143	20,697
Operating income (loss)	11,297	8,249	28,407	22,274
Reconciling Items
Segment Reporting Information [Line Items]
Depreciation and amortization	313	342	865	865
Operating income (loss)	$ (6,351)	$ (5,908)	$ (19,422)	$ (14,962)