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Note 19 - Financial Instruments (Details) - Change in Fair Value of Contingent Consideration Liability (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
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Dec. 31, 2014 | Dec. 31, 2013
Note 19 - Financial Instruments (Details) - Change in Fair Value of Contingent Consideration Liability [Line Items] |  |
Fair value adjustments (note 5) | $ (20,064)us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 |
Balance, December 31, 2014 | 27,136 us-gaap_BusinessCombinationContingentConsiderationLiability |
Less: current portion | 10,971 us-gaap_BusinessCombinationContingentConsiderationLiabilityCurrent | 122 us-gaap_BusinessCombinationContingentConsiderationLiabilityCurrent
Non-current portion | 16,165 us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent | 8,618 us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent
Fair Value, Inputs, Level 3 [Member] |  |
Note 19 - Financial Instruments (Details) - Change in Fair Value of Contingent Consideration Liability [Line Items] |  |
Balance, December 31, 2013 | 8,740 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |
Amounts recognized on acquisitions | 17,838 fsrv_AmountsRecognizedOnAcquisitions / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |
Fair value adjustments (note 5) | 2,371 us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |
Resolved and settled in cash | (238)fsrv_BusinessCombinationResolvedAndSettledInCash / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |
Other | (1,575)fsrv_BusinessCombinationContingentConsiderationArrangementsOther / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |
Balance, December 31, 2014 | 27,136 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |
Less: current portion | 10,971 us-gaap_BusinessCombinationContingentConsiderationLiabilityCurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |
Non-current portion | $ 16,165 us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |

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- Definition Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e7008-128479 + Details
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- Definition Amount of liability recognized arising from contingent consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph b -URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478 + Details
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