Schedule of Amortizable Intangible Asset (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Cost	$ 90,039	$ 90,039
Accumulated Amortization	(29,030)	(20,670)
Net Book Value	61,009	69,369
Customer Related Intangibles Assets
Finite-Lived Intangible Assets [Line Items]
Cost	44,355	44,355
Accumulated Amortization	(11,910)	(8,214)
Net Book Value	32,445	36,141
Technology
Finite-Lived Intangible Assets [Line Items]
Cost	43,446	43,446
Accumulated Amortization	(14,891)	(10,269)
Net Book Value	28,555	33,177
Trade Name
Finite-Lived Intangible Assets [Line Items]
Cost	248	248
Accumulated Amortization	(248)	(248)
Technology Designs
Finite-Lived Intangible Assets [Line Items]
Cost	490	490
Accumulated Amortization	(490)	(463)
Net Book Value		27
Non-Compete Agreements
Finite-Lived Intangible Assets [Line Items]
Cost	100	100
Accumulated Amortization	(91)	(76)
Net Book Value	9	24
Intellectual Property
Finite-Lived Intangible Assets [Line Items]
Cost	1,400	1,400
Accumulated Amortization	$ (1,400)	$ (1,400)