Segment Information about Reported Product Revenues and Operating Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Segment Reporting Information [Line Items]
Product revenues	$ 160,520	$ 136,153	$ 308,610	$ 265,679
Depreciation and amortization	7,796	7,771	15,730	15,292
Operating income (loss)	8,419	8,601	18,210	17,051
CCS
Segment Reporting Information [Line Items]
Product revenues	32,785	33,153	65,763	62,151
Depreciation and amortization	345	313	678	506
Operating income (loss)	8,900	8,738	17,801	15,710
Advanced Technology
Segment Reporting Information [Line Items]
Depreciation and amortization	113	82	227	258
Operating income (loss)	(1,840)	(1,815)	(3,630)	(3,630)
W.E.T.
Segment Reporting Information [Line Items]
Product revenues	127,735	103,000	242,847	203,528
Depreciation and amortization	7,070	7,115	14,273	14,005
Operating income (loss)	7,836	6,703	17,110	14,025
Reconciling Items
Segment Reporting Information [Line Items]
Depreciation and amortization	268	261	552	523
Operating income (loss)	$ (6,477)	$ (5,025)	$ (13,071)	$ (9,054)