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Supplemental Cash Flow Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Supplemental non-cash investing and financing activities:    
Value of common stock issued in acquisitions $ 1,014us-gaap_StockIssuedDuringPeriodValueAcquisitions $ 1,750us-gaap_StockIssuedDuringPeriodValueAcquisitions
Value of common stock issued in payment of accrued liability 0us-gaap_DebtConversionConvertedInstrumentAmount1 600us-gaap_DebtConversionConvertedInstrumentAmount1
Exercise of stock options by common stock surrender 66ftk_StockSurrenderedDuringPeriodValue 1,005ftk_StockSurrenderedDuringPeriodValue
Supplemental cash payment information:    
Interest paid 309us-gaap_InterestPaid 360us-gaap_InterestPaid
Income taxes paid $ 1,911us-gaap_IncomeTaxesPaidNet $ 2,039us-gaap_IncomeTaxesPaidNet