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Acquired Intangible Assets and Weighted Average Amortization Periods (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
2011 acquired intangible assets Total | $ 24,827 | $ 89,921 | $ 29,861
Trade Names |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
2011 acquired intangible assets Total | 8,973 | 4,168 | 6,802
Weighted Average Life | 15 years | 15 years | 13 years
Non-Compete Agreements |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
2011 acquired intangible assets Total | 470 | 793 | 276
Weighted Average Life | 3 years | 2 years | 3 years
Customer Relationships |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
2011 acquired intangible assets Total | 11,343 | 53,895 | 14,832
Weighted Average Life | 6 years | 7 years | 8 years
Unpatented technology and other |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
2011 acquired intangible assets Total | 4,041 | 28,048 | 7,951
Weighted Average Life | 8 years | 6 years | 14 years
Patents |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
2011 acquired intangible assets Total |  | $ 3,017 |
Weighted Average Life |  | 10 years |

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- Definition The aggregate amount assigned to a major class of finite-lived intangible assets acquired either individually or as part of a group of assets (in either an asset acquisition or business combination). 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 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)(1) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16265-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 44 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 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
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