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Accounting Policies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Cumulative probability threshold for realization of income tax benefits | 50.00% |  |
Minimum recognizable tax benefit | 50.00% |  |
Sustainability threshold for uncertain tax position | 50.00% |  |
Advertising expenses | $ 12 | $ 12 | $ 11
Minimum [Member] |  |  |
Equity investments, Ownership percentage | 20.00% |  |
Maximum [Member] |  |  |
Equity investments, Ownership percentage | 50.00% |  |
Contractual customer relationships [Member] | Minimum [Member] |  |  |
Estimated useful lives of intangible assets, maximum | 4 years |  |
Contractual customer relationships [Member] | Maximum [Member] |  |  |
Estimated useful lives of intangible assets, maximum | 12 years |  |
Purchased software [Member] |  |  |
Estimated useful lives of intangible assets, maximum | 4 years |  |
Trademarks and Licenses [Member] | Minimum [Member] |  |  |
Estimated useful lives of intangible assets, maximum | 3 years |  |
Trademarks and Licenses [Member] | Maximum [Member] |  |  |
Estimated useful lives of intangible assets, maximum | 7 years |  |

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- Definition Minimum recognizable tax benefit. + References No definition available. + Details
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- Definition Sustainability Threshold for Uncertain Tax Position. + References No definition available. + Details
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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 93-7 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 159 -Paragraph 18 -Subparagraph f -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 20 -Subparagraph a (1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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