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Weighted Average Useful lives From Date of Purchase of Intangible Assets (Detail) | 12 Months Ended
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Dec. 31, 2011 Year
Land use right |
Finite-Lived Intangible Assets [Line Items] |
Finite-lived intangible asset weighted average useful life (in years) | 50
Customer relationships |
Finite-Lived Intangible Assets [Line Items] |
Finite-lived intangible asset weighted average useful life (in years) | 9.3
Software |
Finite-Lived Intangible Assets [Line Items] |
Finite-lived intangible asset weighted average useful life (in years) | 4.8
Trademarks |
Finite-Lived Intangible Assets [Line Items] |
Finite-lived intangible asset weighted average useful life (in years) | 10
User List |
Finite-Lived Intangible Assets [Line Items] |
Finite-lived intangible asset weighted average useful life (in years) | 3.0
Others |
Finite-Lived Intangible Assets [Line Items] |
Finite-lived intangible asset weighted average useful life (in years) | 4.2

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- Definition The calculated weighted-average useful life of all finite-lived intangible assets. + 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=6905858&loc=d3e16265-109275 + Details
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