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Intangible Assets - Additional Information (Detail) (USD $) | Dec. 31, 2012
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Cost and related amortization finite lived intangible Assets | $ 8,535,000

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- Definition Finite lived intangible assets cost and accumulated amortization removed. + References No definition available. + Details
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Namespace Prefix: | cgnx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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