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Items Reclassified from Other Comprehensive Income - Additional Information (Detail) (Selling, general and administrative [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Selling, general and administrative [Member]
Accumulated Other Comprehensive Losses [Line Items]
Company's defined retirement benefit plan and salary continuation plan	$ 0.3

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- Details

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Data Type:	xbrli:stringItemType
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- Definition

Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Amount Reclassified From Accumulated OCI Into Income

+ References

No definition available.

+ Details

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Namespace Prefix:	tile_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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