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Estimated Useful Lives of Intangible Assets Acquired (Detail) | 9 Months Ended
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Sep. 30, 2013
Customer-Related Intangible Assets | Minimum |
Acquired Finite-Lived Intangible Assets [Line Items] |
Intangible assets estimated useful lives | 1 year
Customer-Related Intangible Assets | Maximum |
Acquired Finite-Lived Intangible Assets [Line Items] |
Intangible assets estimated useful lives | 14 years
Marketing-Related Intangible Assets | Minimum |
Acquired Finite-Lived Intangible Assets [Line Items] |
Intangible assets estimated useful lives | 1 year
Marketing-Related Intangible Assets | Maximum |
Acquired Finite-Lived Intangible Assets [Line Items] |
Intangible assets estimated useful lives | 10 years
Contract-Related Intangible Assets |
Acquired Finite-Lived Intangible Assets [Line Items] |
Intangible assets estimated useful lives | 1 year
Other Intangible Assets | Minimum |
Acquired Finite-Lived Intangible Assets [Line Items] |
Intangible assets estimated useful lives | 3 years
Other Intangible Assets | Maximum |
Acquired Finite-Lived Intangible Assets [Line Items] |
Intangible assets estimated useful lives | 9 years

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- Details
Name: | us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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
Name: | us-gaap_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration