Segment Information about Reported Product Revenues and Operating Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Segment Reporting Information [Line Items]
Product revenues	$ 148,090	$ 129,526
Depreciation and amortization	7,934	7,521
Operating income (loss)	9,791	8,450
CCS
Segment Reporting Information [Line Items]
Product revenues	32,978	28,998
Depreciation and amortization	333	287
Operating income (loss)	8,901	6,972
Advanced Technology
Segment Reporting Information [Line Items]
Depreciation and amortization	114	82
Operating income (loss)	(1,790)	(1,815)
W.E.T.
Segment Reporting Information [Line Items]
Product revenues	115,112	100,528
Depreciation and amortization	7,203	6,890
Operating income (loss)	9,274	7,322
Reconciling Items
Segment Reporting Information [Line Items]
Depreciation and amortization	284	262
Operating income (loss)	$ (6,594)	$ (4,029)