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Note 5 - Acquisition-related Items (Details) - Composition of Acquisition-related Expense (Income) (USD $) In Thousands, unless otherwise specified | 1 Months Ended | 12 Months Ended
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Mar. 28, 2012 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Composition of Acquisition-related Expense (Income) [Abstract] |  |  |  |
Transaction costs |  | $ 9,454 us-gaap_BusinessCombinationAcquisitionRelatedCosts | $ 3,336 us-gaap_BusinessCombinationAcquisitionRelatedCosts | $ 5,032 us-gaap_BusinessCombinationAcquisitionRelatedCosts
Contingent consideration fair value adjustments |  | 2,145 fsrv_ContingentConsiderationFairValueAdjustments | 1,801 fsrv_ContingentConsiderationFairValueAdjustments | 3,645 fsrv_ContingentConsiderationFairValueAdjustments
Contingent consideration compensation expense |  | 226 fsrv_ContingentConsiderationCompensationExpense | 6,181 fsrv_ContingentConsiderationCompensationExpense | 5,096 fsrv_ContingentConsiderationCompensationExpense
Reclassification from accumulated other comprehensive loss | 2,553 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax |  |  | 2,553 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax
Gain on revaluation of previously held equity investment (note 3) |  |  | (820)fsrv_BusinessCombinationGainOnRevaluationOfPreviouslyHeldEquityInvestment |
|  | $ 11,825 us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAdditionalDisclosuresAcquisitionCostExpensed | $ 10,498 us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAdditionalDisclosuresAcquisitionCostExpensed | $ 16,326 us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAdditionalDisclosuresAcquisitionCostExpensed

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- Definition The business combination gain on revaluation of previously held equity investment. + References No definition available. + Details
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Namespace Prefix: | fsrv_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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Balance Type: | na
Period Type: | duration

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- Definition The contingent consideration compensation expense. + References No definition available. + Details
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Namespace Prefix: | fsrv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The contingent consideration fair value adjustments. + References No definition available. + Details
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Namespace Prefix: | fsrv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e1043-128460 + Details
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- Definition For transactions that are recognized separately from the acquisition of assets and assumptions of liabilities in the business combination, such as related to pre-existing relationships with the acquiree, this element represents the disclosure of the amount of acquisition related costs which have been expensed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition Amount after tax of reclassification adjustment from accumulated other comprehensive income for translation gain (loss) realized upon the sale or liquidation of an investment in a foreign entity and foreign currency hedges that are designated and qualified as hedging instruments for hedges of the foreign currency exposure of a net investment in a foreign operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e689-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e709-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6915805&loc=d3e32211-110900 + Details
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Period Type: | duration