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Goodwill And Intangible Assets (Summary Of Intangible Assets) (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Document Period End Date | Mar. 31, 2013 |  |
Weighted Average Amortization Period of Finite Lived Assets (in years) | 14 years |  |
Gross Asset | $ 285,887 | $ 291,106 |
Accumulated Amortization | 167,322 | 165,193 |
Net | 118,565 | 125,913 |
Finite-Lived Intangible Assets, Net | 118,565 | 125,913 | 146,227
Intellectual Property Rights |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted Average Amortization Period of Finite Lived Assets (in years) | 18 years 9 months 18 days |  |
Gross Asset | 87,234 | 88,614 |
Accumulated Amortization | 47,120 | 47,202 |
Net | 40,114 | 41,412 |
Customer Relationships |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted Average Amortization Period of Finite Lived Assets (in years) | 11 years 7 months 6 days |  |
Gross Asset | 137,123 | 140,250 |
Accumulated Amortization | 75,173 | 73,630 |
Net | 61,950 | 66,620 |
Drawings |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted Average Amortization Period of Finite Lived Assets (in years) | 37 years 10 months 24 days |  |
Gross Asset | 11,149 | 11,149 |
Accumulated Amortization | 9,875 | 9,850 |
Net | 1,274 | 1,299 |
Other Intangible Assets |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted Average Amortization Period of Finite Lived Assets (in years) | 14 years |  |
Gross Asset | 50,381 | 51,093 |
Accumulated Amortization | 35,154 | 34,511 |
Net | $ 15,227 | $ 16,582 |

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- Definition Sum of the gross carrying amounts before accumulated amortization as of the balance sheet date of all intangible assets having indefinite, statutory or estimated useful lives. The aggregate gross carrying amount (including any previously recognized impairment charges) of a major 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. + References No definition available. + Details
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- Definition The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD. + References No definition available. + Details
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -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 Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -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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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 42, 45 -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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