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Goodwill and Intangible Assets (Narrative) (Detail) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2013 Segment | Dec. 31, 2012
Goodwill And Intangible Assets [Line Items] |  |
Document Period End Date | Mar. 31, 2013 |
Number of reporting units | 11 |
Estimated cost of capital, minimum |  | 9.50%
Estimated cost of capital, maximum |  | 17.00%
Estimated cost of capital, weighted |  | 11.00%
Hypothetical decrease to fair values of each reporting unit |  | 10.00%
Net intangible assets | $ 118,565,000 | $ 125,913,000
Intangibles with indefinite useful lives | 30,700,000 |
Estimated amortization expense for intangible assets, current year | 12,000,000 |
Estimated amortization expense for intangible assets, year 2013 | 14,100,000 |
Estimated amortization expense for intangible assets, year 2014 | 12,300,000 |
Estimated amortization expense for intangible assets, year 2015 | 11,600,000 |
Estimated amortization expense for intangible assets, year 2016 | 11,100,000 |
Estimated amortization expense for intangible assets, year 2017 and thereafter | $ 26,900,000 |

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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 Amount of amortization expense expected to be recognized after the fifth fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References No definition available. + Details
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