Note 8. Business Combinations (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2012	Mar. 31, 2012
Business Acquisition, Cost of Acquired Entity, Cash Paid (in Dollars)			$ 45.8
Increase Portfolio of Patent Assets Acquired		30.00%
Business Combination, Acquisition Related Costs (in Dollars)	$ 0.4	$ 0.5
Patents [Member]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		55 months
Proprietary Business Processes [Member]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		48 months
Trademarks [Member]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		48 months
Noncompete Agreements [Member]
Finite-Lived Intangible Asset, Useful Life		21 months