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No authoritative reference available. true 8 Selling, general and administrative expenses 3 us-gaap_SellingGeneralAndAdministrativeExpense us-gaap true debit duration No definition available. false false false false false false false false false false false label false 1 false true false false 69515000 69515 false false false 2 false true false false 69024000 69024 false false false 3 false true false false 139820000 139820 false false false 4 false true false false 138272000 138272 false false false xbrli:monetaryItemType monetary The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. 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(1) Income... false false false false false false false false false false true negated false 1 false true false false -11419000 -11419 false false false 2 false true false false -11490000 -11490 false false false 3 false true false false -19751000 -19751 false false false 4 false true false false -19693000 -19693 false false false xbrli:monetaryItemType monetary Other Income includes both (1) Income (Loss) from Equity Method Investments and (2) Other Nonoperating Income. (1) Income (Loss) from Equity Method Investments: This item represents the entity's proportionate share for the period of the undistributed net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. Such amount typically reflects adjustments similar to those made in preparing consolidated statements, including adjustments to eliminate intercompany gains and losses, and to amortize, if appropriate, any difference between cost and underlying equity in net assets of the investee at the date of investment. (2) Other Nonoperating Income: The aggregate amount of other income amounts resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income recognized for the period. Such amounts may include miscellaneous other income items. No authoritative reference available. false 10 Other deductions, net 3 fwlt_OtherDeductionsNet fwlt false debit duration Other Deductions includes both (1) Other General Expense, and (2) Other Nonoperating Expense. (1) Other General Expense:... false false false false false false false false false false false label false 1 false true false false 8049000 8049 false false false 2 false true false false 6898000 6898 false false false 3 false true false false 19737000 19737 false false false 4 false true false false 12985000 12985 false false false xbrli:monetaryItemType monetary Other Deductions includes both (1) Other General Expense, and (2) Other Nonoperating Expense. (1) Other General Expense: Amount of general expenses not normally included in Selling, general and administrative expenses. (2) Other Nonoperating Expense: Any other expense items resulting from secondary business-related activities, excluding those considered part of the normal operations of the business that have not been previously categorized. No authoritative reference available. false 11 Interest income 3 us-gaap_InvestmentIncomeInterest us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false -2730000 -2730 false false false 2 false true false false -2426000 -2426 false false false 3 false true false false -5089000 -5089 false false false 4 false true false false -5098000 -5098 false false false xbrli:monetaryItemType monetary Income derived from investments in debt securities and on cash and cash equivalents the earnings of which reflect the time value of money or transactions in which the payments are for the use or forbearance of money. 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No authoritative reference available. false 14 Income before income taxes 3 fwlt_IncomeLossBeforeIncomeTaxes fwlt false credit duration Sum of operating profit and nonoperating income (expense) before income taxes and including the portion attributable to... false false false false false false false false false false false totallabel false 1 false true false false 78057000 78057 false false false 2 false true false false 154895000 154895 false false false 3 false true false false 175033000 175033 false false false 4 false true false false 247270000 247270 false false false xbrli:monetaryItemType monetary Sum of operating profit and nonoperating income (expense) before income taxes and including the portion attributable to noncontrolling interest. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A1, A4, A5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 5 -Subparagraph b Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 29 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph a Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(1) true 17 Less: Net income attributable to noncontrolling interests 3 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest us-gaap true debit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false 3790000 3790 false false false 2 false true false false 5130000 5130 false false false 3 false true false false 7096000 7096 false false false 4 false true false false 6639000 6639 false false false xbrli:monetaryItemType monetary The portion of net income (loss) attributable to the noncontrolling interest (if any) deducted in order to derive the portion attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph a Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(1) Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A1, A4, A5 false 18 Net income attributable to Foster Wheeler AG 3 us-gaap_NetIncomeLoss us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 true true false false 58858000 58858 false false false 2 true true false false 122204000 122204 false false false 3 true true false false 130918000 130918 false false false 4 true true false false 195067000 195067 false false false xbrli:monetaryItemType monetary The portion of consolidated profit or loss for the period, net of income taxes, which is attributable to the parent. If the entity does not present consolidated financial statements, the amount of profit or loss for the period, net of income taxes. 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