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Useful Lives of Acquired Intangible Assets (Detail) | 12 Months Ended
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Dec. 31, 2012
Order Backlog [Member] |
Finite-Lived Intangible Assets [Line Items] |
Acquired intangible assets useful life | 6 months
Product Development [Member] |
Finite-Lived Intangible Assets [Line Items] |
Acquired intangible assets useful life | 4 years
Minimum [Member] | Customer Relationship [Member] |
Finite-Lived Intangible Assets [Line Items] |
Acquired intangible assets useful life | 10 years
Minimum [Member] | Technology [Member] |
Finite-Lived Intangible Assets [Line Items] |
Acquired intangible assets useful life | 8 years
Maximum [Member] | Customer Relationship [Member] |
Finite-Lived Intangible Assets [Line Items] |
Acquired intangible assets useful life | 15 years
Maximum [Member] | Technology [Member] |
Finite-Lived Intangible Assets [Line Items] |
Acquired intangible assets useful life | 9 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=7658586&loc=d3e16265-109275 + Details
Name: | us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration