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Note 14 - Supplemental Condensed Consolidating Guarantor Financial Statements (Details) | 6 Months Ended
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Jun. 30, 2013
Supplemental Guarantor Financial Statements [Abstract] |
Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions | 100.00%

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- Details
Name: | tile_SupplementalGuarantorFinancialStatementsTextBlockAbstract
Namespace Prefix: | tile_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of subsidiary's or equity method investee's stock owned by parent immediately after all stock transactions. + References No definition available. + Details
Name: | us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration