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Acquired Intangible Assets and Weighted Average Amortization Periods (Detail) (USD $) In Thousands, unless otherwise specified | 0 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 18, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible assets, Total | $ 13,016 | $ 24,827 | $ 89,921
Trade Names |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible assets, Total | 1,005 | 8,973 | 4,168
Weighted Average Life | 15 years | 15 years | 15 years
Non-Compete Agreements |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible assets, Total | 224 | 470 | 793
Weighted Average Life | 3 years | 3 years | 2 years
Customer Relationships |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible assets, Total | 10,950 | 11,343 | 53,895
Weighted Average Life | 9 years | 6 years | 7 years
Unpatented technology and other |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible assets, Total | 837 | 4,041 | 28,048
Weighted Average Life | 8 years | 8 years | 6 years
Patents |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible assets, Total |  |  | $ 3,017
Weighted Average Life |  |  | 10 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=26713463&loc=d3e16265-109275 + Details
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- Definition Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, resulting from a business combination. + References No definition available. + Details
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