Schedule Of Gross Carrying Amount And Accumulated Amortization Of Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 81,932	$ 81,959
Accumulated Amortization	33,909	19,963
Net Carrying Amount	48,023	61,996
Developed Technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	40,200	40,200
Accumulated Amortization	19,371	9,416
Net Carrying Amount	20,829	30,784
Weighted Average Useful Life, years	7 years	7 years
In-Process Research And Development
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,900	1,900
Accumulated Amortization	207	0
Net Carrying Amount	1,693	1,900
Weighted Average Useful Life, years	8 years	8 years
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	17,600	17,600
Accumulated Amortization	2,611	623
Net Carrying Amount	14,989	16,977
Weighted Average Useful Life, years	9 years	9 years
Trademarks
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	5,200	5,200
Accumulated Amortization	627	303
Net Carrying Amount	4,573	4,897
Weighted Average Useful Life, years	10 years	10 years
Lease Agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,600	2,600
Accumulated Amortization	574	245
Net Carrying Amount	2,026	2,355
Weighted Average Useful Life, years	5 years	5 years
Total Other Acquired Intangible Assets From Vocollect Acquisition
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	67,500	67,500
Accumulated Amortization	23,390	10,587
Net Carrying Amount	44,110	56,913
Other Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	14,432	14,459
Accumulated Amortization	10,519	9,376
Net Carrying Amount	$ 3,913	$ 5,083
Weighted Average Useful Life, years	5 years	5 years