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Weighted Average Amortization Period for Finite Lived Intangible Assets (Detail) | 12 Months Ended
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Dec. 31, 2012
Trade Names |
Finite-Lived Intangible Assets [Line Items] |
Finite-lived intangible assets, weighted-average amortization periods | 15 years
License |
Finite-Lived Intangible Assets [Line Items] |
Finite-lived intangible assets, weighted-average amortization periods | 33 years
Customer Relationships |
Finite-Lived Intangible Assets [Line Items] |
Finite-lived intangible assets, weighted-average amortization periods | 14 years
Patents |
Finite-Lived Intangible Assets [Line Items] |
Finite-lived intangible assets, weighted-average amortization periods | 17 years

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16265-109275 + Details
Name: | us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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