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Acquisitions - Additional Durational Information (Detail)
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12 Months Ended |
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Dec. 31, 2011
Entity
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Total Other Acquisitions
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| Business Acquisition [Line Items] | |
| Actual number of other acquisitions and purchase of intangible completed | 78 |
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Patents and developed technology
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| Business Acquisition [Line Items] | |
| Acquired intangible assets, weighted-average useful life (in years) | 6.3 |
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Customer relationships
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| Business Acquisition [Line Items] | |
| Acquired intangible assets, weighted-average useful life (in years) | 6.6 |
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Trade names and other
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| Business Acquisition [Line Items] | |
| Acquired intangible assets, weighted-average useful life (in years) | 4.2 |