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No authoritative reference available. false 5 Reimbursable expenses 2 us-gaap_ReimbursementRevenue us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 11525000 11525 false false false 2 false true false false 6919000 6919 false false false 3 false true false false 30375000 30375 false false false 4 false true false false 19942000 19942 false false false xbrli:monetaryItemType monetary Repayment received for expenses incurred on behalf of the client or customer, other than those reimbursements received by landlords from tenants. No authoritative reference available. true 6 Total gross revenues 2 us-gaap_SalesRevenueServicesNet us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 228582000 228582 false false false 2 false true false false 172460000 172460 false false false 3 false true false false 631006000 631006 false false false 4 false true false false 475376000 475376 false false false xbrli:monetaryItemType monetary Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 false 7 Operating expenses: 1 us-gaap_CostsAndExpensesAbstract us-gaap true na duration No definition available. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 8 Project personnel expenses 2 us-gaap_LaborAndRelatedExpense us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 148003000 148003 false false false 2 false true false false 114219000 114219 false false false 3 false true false false 415115000 415115 false false false 4 false true false false 316336000 316336 false false false xbrli:monetaryItemType monetary The aggregate amount of expenditures for salaries, wages, profit sharing and incentive compensation, and other employee benefits, including share-based compensation, and pension and other postretirement benefit expense. No authoritative reference available. false 9 Reimbursable expenses 2 us-gaap_CostOfReimbursableExpense us-gaap true debit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 11525000 11525 false false false 2 false true false false 6919000 6919 false false false 3 false true false false 30375000 30375 false false false 4 false true false false 19942000 19942 false false false xbrli:monetaryItemType monetary Cost associated with reimbursable income. This occurs when a services entity incurs expenses on behalf of the client and passes through the cost of reimbursable expenses to a client. No authoritative reference available. true 10 Total project personnel expenses and reimbursable expenses 2 us-gaap_CostOfServices us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 159528000 159528 false false false 2 false true false false 121138000 121138 false false false 3 false true false false 445490000 445490 false false false 4 false true false false 336278000 336278 false false false xbrli:monetaryItemType monetary Total costs related to services rendered by an entity during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 2 -Article 5 false 11 Selling and marketing expenses 2 us-gaap_SellingAndMarketingExpense us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 9298000 9298 false false false 2 false true false false 8055000 8055 false false false 3 false true false false 28170000 28170 false false false 4 false true false false 22471000 22471 false false false xbrli:monetaryItemType monetary The aggregate total amount of expenses directly related to the marketing or selling of products or services. No authoritative reference available. false 12 General and administrative expenses 2 us-gaap_GeneralAndAdministrativeExpense us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 38443000 38443 false false false 2 false true false false 30207000 30207 false false false 3 false true false false 110821000 110821 false false false 4 false true false false 84325000 84325 false false false xbrli:monetaryItemType monetary The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line. No authoritative reference available. false 13 Restructuring and other related charges 2 us-gaap_RestructuringCharges us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 34000 34 false false false 2 false true false false 2518000 2518 false false false 3 false true false false 448000 448 false false false 4 false true false false 4821000 4821 false false false xbrli:monetaryItemType monetary Amount charged against earnings in the period for incurred and estimated costs, excluding asset retirement obligations, associated with exit from or disposal of business activities or restructurings pursuant to a program that is planned and controlled by management, and materially changes either the scope of a business undertaken by an entity, or the manner in which that business is conducted. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 false 14 Amortization of purchased intangible assets 2 us-gaap_AmortizationOfIntangibleAssets us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 1301000 1301 false false false 2 false true false false 1681000 1681 false false false 3 false true false false 4127000 4127 false false false 4 false true false false 3446000 3446 false false false xbrli:monetaryItemType monetary The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by (used in) operations using the indirect method. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(2) false 15 Acquisition costs and other related charges 2 us-gaap_BusinessCombinationAcquisitionRelatedCosts us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false true false false 1110000 1110 false false false 3 false true false false 111000 111 false false false 4 false true false false 2783000 2783 false false false xbrli:monetaryItemType monetary 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. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 59 false 16 Total operating expenses 2 us-gaap_CostsAndExpenses us-gaap true debit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 208604000 208604 false false false 2 false true false false 164709000 164709 false false false 3 false true false false 589167000 589167 false false false 4 false true false false 454124000 454124 false false false xbrli:monetaryItemType monetary Total costs of sales and operating expenses for the period. No authoritative reference available. true 17 Income from operations 1 us-gaap_OperatingIncomeLoss us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 19978000 19978 false false false 2 false true false false 7751000 7751 false false false 3 false true false false 41839000 41839 false false false 4 false true false false 21252000 21252 false false false xbrli:monetaryItemType monetary The net result for the period of deducting operating expenses from operating revenues. No authoritative reference available. false 18 Interest and other income, net 1 us-gaap_NonoperatingIncomeExpense us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 942000 942 false false false 2 false true false false 652000 652 false false false 3 false true false false 2487000 2487 false false false 4 false true false false 2467000 2467 false false false xbrli:monetaryItemType monetary The aggregate amount of income (expense) from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business). 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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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