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Useful Life of Other Purchased Intangible Assets (Detail)
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12 Months Ended |
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Dec. 31, 2011
Year
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Purchased data files
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| Finite-Lived Intangible Assets [Line Items] | |
| Useful Life, Minimum | 2 |
| Useful Life, Maximum | 15 |
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Acquired software and technology
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| Finite-Lived Intangible Assets [Line Items] | |
| Useful Life, Minimum | 1 |
| Useful Life, Maximum | 10 |
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Non-compete agreements
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| Finite-Lived Intangible Assets [Line Items] | |
| Useful Life, Minimum | 1 |
| Useful Life, Maximum | 10 |
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Proprietary database
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| Finite-Lived Intangible Assets [Line Items] | |
| Useful Life, Minimum | 6 |
| Useful Life, Maximum | 10 |
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Customer relationships
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| Finite-Lived Intangible Assets [Line Items] | |
| Useful Life, Minimum | 2 |
| Useful Life, Maximum | 25 |
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Trade names
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| Finite-Lived Intangible Assets [Line Items] | |
| Useful Life, Minimum | 5 |
| Useful Life, Maximum | 15 |
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- Details
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- Definition
The maximum useful life of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar either by their nature or by their use in the operations of a company. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The minimum useful life of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar either by their nature or by their use in the operations of a company. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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