1.0.0.3 false CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Share data false 1 $ false false shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 USDPerShare Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 false 2 $ false false shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 USDPerShare Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 false 3 $ false false shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 USDPerShare Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 2 CONSOLIDATED STATEMENTS OF INCOME 0 us-gaap_IncomeStatementAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false 3 false false 0 0 false false No definition available. false 3 Net revenues 1 cvd_NetRevenues cvd false credit duration monetary Revenue from services rendered and products sold during the reporting period, in the normal course of business, reduced by... false false false false false false false false false 1 true true 1867634000 1867634 false false 2 true true 1728098000 1728098 false false 3 true true 1546419000 1546419 false false Revenue from services rendered and products sold during the reporting period, in the normal course of business, reduced by sales returns and allowances and sales discounts. Excludes reimbursable out-of-pockets. No authoritative reference available. false 4 Reimbursable out-of-pocket expenses 1 cvd_ReimbursableOutOfPocketExpenses cvd false debit duration monetary Amounts paid or expenses incurred on behalf of the client or customer during the reporting period, in the normal course of... false false false false false false false false false 1 false true 94992000 94992 false false 2 false true 98969000 98969 false false 3 false true 85097000 85097 false false Amounts paid or expenses incurred on behalf of the client or customer during the reporting period, in the normal course of business, reimbursed at cost, without mark-up or profit. No authoritative reference available. false 5 Total revenues 1 us-gaap_Revenues us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 1962626000 1962626 false false 2 false true 1827067000 1827067 false false 3 false true 1631516000 1631516 false false No definition available. No authoritative reference available. true 6 Costs and expenses: 1 us-gaap_CostsAndExpensesAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false 3 false false 0 0 false false No definition available. false 7 Cost of revenue (excluding depreciation and amortization) 2 cvd_CostOfRevenueExcludingDepreciationAndAmortization cvd false debit duration monetary The aggregate cost of services rendered and products produced and sold during the reporting period, including direct labor... false false false false false false false false false 1 false true 1277142000 1277142 false false 2 false true 1142697000 1142697 false false 3 false true 1017686000 1017686 false false The aggregate cost of services rendered and products produced and sold during the reporting period, including direct labor and related benefit charges, other direct costs, shipping and handling fees, and an allocation of facility charges and information technology costs. Excludes depreciation and amortization. No authoritative reference available. false 8 Reimbursable out-of-pocket expenses 2 us-gaap_CostOfReimbursableExpense us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 94992000 94992 false false 2 false true 98969000 98969 false false 3 false true 85097000 85097 false false No definition available. No authoritative reference available. false 9 Selling, general and administrative (excluding depreciation and amortization) 2 cvd_SellingGeneralAndAdministrativeExcludingDepreciationAndAmortization cvd false debit duration monetary Aggregate costs related to selling services and products, as well as other general and administrative expenses, consisting... false false false false false false false false false 1 false true 270593000 270593 false false 2 false true 250180000 250180 false false 3 false true 233890000 233890 false false Aggregate costs related to selling services and products, as well as other general and administrative expenses, consisting primarily of payroll and related benefit charges, advertising and promotional expenses, administrative travel, and an allocation of facility charges and information technology costs. Excludes depreciation and amortization. No authoritative reference available. false 10 Depreciation and amortization 2 us-gaap_OtherDepreciationAndAmortization us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 91289000 91289 false false 2 false true 71571000 71571 false false 3 false true 66197000 66197 false false No definition available. No authoritative reference available. false 11 Total costs and expenses 2 us-gaap_CostsAndExpenses us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 1734016000 1734016 false false 2 false true 1563417000 1563417 false false 3 false true 1402870000 1402870 false false No definition available. No authoritative reference available. true 12 Income from operations 1 us-gaap_OperatingIncomeLoss us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 228610000 228610 false false 2 false true 263650000 263650 false false 3 false true 228646000 228646 false false No definition available. No authoritative reference available. true 13 Other (income) expense, net: 1 us-gaap_NonoperatingIncomeExpenseAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false 3 false false 0 0 false false No definition available. false 14 Interest income 2 us-gaap_InvestmentIncomeInterest us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -1355000 -1355 false false 2 false true -8304000 -8304 false false 3 false true -10269000 -10269 false false No definition available. No authoritative reference available. false 15 Interest expense 2 us-gaap_InterestExpense us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 1556000 1556 false false 2 false true 1843000 1843 false false 3 false true 468000 468 false false No definition available. No authoritative reference available. false 16 Foreign exchange transaction loss (gain), net 2 us-gaap_ForeignCurrencyTransactionGainLossBeforeTax us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 245000 245 false false 2 false true -142000 -142 false false 3 false true -1375000 -1375 false false No definition available. No authoritative reference available. false 17 Gain on sale of businesses 2 us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -9681000 -9681 false false 2 false true -4070000 -4070 false false 3 false true -6590000 -6590 false false No definition available. No authoritative reference available. false 18 Other income, net 2 us-gaap_NonoperatingIncomeExpense us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -9235000 -9235 false false 2 false true -10673000 -10673 false false 3 false true -17766000 -17766 false false No definition available. No authoritative reference available. true 19 Income before taxes and equity investee earnings 1 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 237845000 237845 false false 2 false true 274323000 274323 false false 3 false true 246412000 246412 false false No definition available. No authoritative reference available. true 20 Taxes on income 1 us-gaap_IncomeTaxExpenseBenefit us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 62870000 62870 false false 2 false true 79415000 79415 false false 3 false true 72934000 72934 false false No definition available. No authoritative reference available. false 21 Equity investee earnings 1 us-gaap_IncomeLossFromEquityMethodInvestments us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 907000 907 false false 2 false true 1852000 1852 false false 3 false true 2451000 2451 false false No definition available. No authoritative reference available. false 22 Net income 1 us-gaap_NetIncomeLoss us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 true true 175882000 175882 false false 2 true true 196760000 196760 false false 3 true true 175929000 175929 false false No definition available. No authoritative reference available. true 23 Basic earnings per share 1 us-gaap_EarningsPerShareBasic us-gaap true na duration decimal No definition available. false false false false false false false false true 1 true true 2.76 2.76 false false 2 true true 3.12 3.12 false false 3 true true 2.76 2.76 false false No definition available. No authoritative reference available. false 24 Weighted average shares outstanding - basic 1 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic us-gaap true na duration shares No definition available. false false false false false false false false false 1 false true 63818717 63818717.00 false false 2 false true 63096155 63096155.00 false false 3 false true 63747732 63747732.00 false false No definition available. No authoritative reference available. false 25 Diluted earnings per share 1 us-gaap_EarningsPerShareDiluted us-gaap true na duration decimal No definition available. false false false false false false false false true 1 true true 2.73 2.73 false false 2 true true 3.08 3.08 false false 3 true true 2.71 2.71 false false No definition available. No authoritative reference available. false 26 Weighted average shares outstanding - diluted 1 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding us-gaap true na duration shares No definition available. false false false false false false false false false 1 false true 64341084 64341084.00 false false 2 false true 63981505 63981505.00 false false 3 false true 64820406 64820406.00 false false No definition available. No authoritative reference available. false false 3 25 false Thousands NoRounding Hundreds false true