0000001 - Document - Cover link:presentationLink link:calculationLink link:definitionLink 0000002 - Document - Audit Information link:presentationLink link:calculationLink link:definitionLink 9952151 - Statement - CONSOLIDATED BALANCE SHEETS link:presentationLink link:calculationLink link:definitionLink 9952152 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 9952153 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS link:presentationLink link:calculationLink link:definitionLink 9952154 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME link:presentationLink link:calculationLink link:definitionLink 9952155 - Statement - CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY link:presentationLink link:calculationLink link:definitionLink 9952156 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS link:presentationLink link:calculationLink link:definitionLink 9952157 - Disclosure - Description of Business link:presentationLink link:calculationLink link:definitionLink 9952158 - Disclosure - Restatement of Previously Issued Consolidated Financial Statements link:presentationLink link:calculationLink link:definitionLink 9952159 - Disclosure - Summary of Significant Accounting Policies link:presentationLink link:calculationLink link:definitionLink 9952160 - Disclosure - Disaggregation of revenue link:presentationLink link:calculationLink link:definitionLink 9952161 - Disclosure - Accounts receivable, unbilled revenue (contract assets) and unearned revenue or payments on account (contract liabilities) link:presentationLink link:calculationLink link:definitionLink 9952162 - Disclosure - Allowance for credit losses link:presentationLink link:calculationLink link:definitionLink 9952163 - Disclosure - Business combinations link:presentationLink link:calculationLink link:definitionLink 9952164 - Disclosure - Fair value link:presentationLink link:calculationLink link:definitionLink 9952165 - Disclosure - Investments in equity link:presentationLink link:calculationLink link:definitionLink 9952166 - Disclosure - Property, plant and equipment, net link:presentationLink link:calculationLink link:definitionLink 9952167 - Disclosure - Goodwill link:presentationLink link:calculationLink link:definitionLink 9952168 - Disclosure - Intangible assets link:presentationLink link:calculationLink link:definitionLink 9952169 - Disclosure - Other liabilities link:presentationLink link:calculationLink link:definitionLink 9952170 - Disclosure - Bank credit lines, loan facilities and notes link:presentationLink link:calculationLink link:definitionLink 9952171 - Disclosure - Derivatives link:presentationLink link:calculationLink link:definitionLink 9952172 - Disclosure - Operating Leases link:presentationLink link:calculationLink link:definitionLink 9952173 - Disclosure - Non-current other liabilities link:presentationLink link:calculationLink link:definitionLink 9952174 - Disclosure - Commitments and contingencies link:presentationLink link:calculationLink link:definitionLink 9952175 - Disclosure - Share Capital link:presentationLink link:calculationLink link:definitionLink 9952176 - Disclosure - Restructuring Charges link:presentationLink link:calculationLink link:definitionLink 9952177 - Disclosure - Income Taxes link:presentationLink link:calculationLink link:definitionLink 9952178 - Disclosure - Equity Incentive Schemes and Stock Compensation Charges link:presentationLink link:calculationLink link:definitionLink 9952179 - Disclosure - Business Segment and Geographical Information link:presentationLink link:calculationLink link:definitionLink 9952180 - Disclosure - Net Income Per Ordinary Share link:presentationLink link:calculationLink link:definitionLink 9952181 - Disclosure - Accumulated Other Comprehensive Loss link:presentationLink link:calculationLink link:definitionLink 9952182 - Disclosure - Supplemental Disclosure of Cash Flow Information link:presentationLink link:calculationLink link:definitionLink 9952183 - Disclosure - Related Parties link:presentationLink link:calculationLink link:definitionLink 9952184 - Disclosure - Subsequent Events link:presentationLink link:calculationLink link:definitionLink 9955511 - Disclosure - Summary of Significant Accounting Policies (Policies) link:presentationLink link:calculationLink link:definitionLink 9955512 - Disclosure - Restatement of Previously Issued Consolidated Financial Statements (Tables) link:presentationLink link:calculationLink link:definitionLink 9955513 - Disclosure - Summary of Significant Accounting Policies (Tables) link:presentationLink link:calculationLink link:definitionLink 9955514 - Disclosure - Disaggregation of revenue (Tables) link:presentationLink link:calculationLink link:definitionLink 9955515 - Disclosure - Accounts receivable, unbilled revenue (contract assets) and unearned revenue or payments on account (contract liabilities) (Tables) link:presentationLink link:calculationLink link:definitionLink 9955516 - Disclosure - Allowance for credit losses (Tables) link:presentationLink link:calculationLink link:definitionLink 9955517 - Disclosure - Fair value (Tables) link:presentationLink link:calculationLink link:definitionLink 9955518 - Disclosure - Property, plant and equipment, net (Tables) link:presentationLink link:calculationLink link:definitionLink 9955519 - Disclosure - Goodwill (Tables) link:presentationLink link:calculationLink link:definitionLink 9955520 - Disclosure - Intangible assets (Tables) link:presentationLink link:calculationLink link:definitionLink 9955521 - Disclosure - Other liabilities (Tables) link:presentationLink link:calculationLink link:definitionLink 9955522 - Disclosure - Bank credit lines, loan facilities and notes (Tables) link:presentationLink link:calculationLink link:definitionLink 9955523 - Disclosure - Derivatives (Tables) link:presentationLink link:calculationLink link:definitionLink 9955524 - Disclosure - Operating Leases (Tables) link:presentationLink link:calculationLink link:definitionLink 9955525 - Disclosure - Non-current other liabilities (Tables) link:presentationLink link:calculationLink link:definitionLink 9955526 - Disclosure - Share Capital (Tables) link:presentationLink link:calculationLink link:definitionLink 9955527 - Disclosure - Restructuring Charges (Tables) link:presentationLink link:calculationLink link:definitionLink 9955528 - Disclosure - Income Taxes (Tables) link:presentationLink link:calculationLink link:definitionLink 9955529 - Disclosure - Equity Incentive Schemes and Stock Compensation Charges (Tables) link:presentationLink link:calculationLink link:definitionLink 9955530 - Disclosure - Business Segment and Geographical Information (Tables) link:presentationLink link:calculationLink link:definitionLink 9955531 - Disclosure - Net Income Per Ordinary Share (Tables) link:presentationLink link:calculationLink link:definitionLink 9955532 - Disclosure - Accumulated Other Comprehensive Loss (Tables) link:presentationLink link:calculationLink link:definitionLink 9955533 - Disclosure - Supplemental Disclosure of Cash Flow Information (Tables) link:presentationLink link:calculationLink link:definitionLink 9955534 - Disclosure - Description of Business (Details) link:presentationLink link:calculationLink link:definitionLink 9955535 - Disclosure - Restatement of Previously Issued Consolidated Financial Statements - Narrative (Details) (Details) link:presentationLink link:calculationLink link:definitionLink 9955536 - Disclosure - Restatement of Previously Issued Consolidated Financial Statements - Restated Consolidated Statements of Operations (Details) link:presentationLink link:calculationLink link:definitionLink 9955537 - Disclosure - Restatement of Previously Issued Consolidated Financial Statements - Restated Consolidated Statements of Comprehensive Income (Details) link:presentationLink link:calculationLink link:definitionLink 9955538 - Disclosure - Restatement of Previously Issued Consolidated Financial Statements - Restated Consolidated Balance Sheets (Details) link:presentationLink link:calculationLink link:definitionLink 9955539 - Disclosure - Restatement of Previously Issued Consolidated Financial Statements - Restated Consolidated Statements of Cash Flows (Details) link:presentationLink link:calculationLink link:definitionLink 9955540 - Disclosure - Summary of Significant Accounting Policies - Schedule of Amounts Charged or Credited to the Consolidated Statements of Operations (Details) link:presentationLink link:calculationLink link:definitionLink 9955541 - Disclosure - Summary of Significant Accounting Policies - Schedule of Depreciation of Property, Plant and Equipment Computed Using Straight Line Method Based On Estimated Useful Lives of Assets (Details) link:presentationLink link:calculationLink link:definitionLink 9955542 - Disclosure - Summary of Significant Accounting Policies - Schedule of Estimated Useful Lives of Intangible Assets Amortized on Straight-Line Basis (Details) link:presentationLink link:calculationLink link:definitionLink 9955543 - Disclosure - Disaggregation of revenue (Details) link:presentationLink link:calculationLink link:definitionLink 9955544 - Disclosure - Accounts receivable, unbilled revenue (contract assets) and unearned revenue or payments on account (contract liabilities) - Schedule of Accounts Receivables and Unbilled Revenue (Details) link:presentationLink link:calculationLink link:definitionLink 9955545 - Disclosure - Accounts receivable, unbilled revenue (contract assets) and unearned revenue or payments on account (contract liabilities) - Schedule of Unbilled Services and Unearned Revenue or Payments on Account (Details) link:presentationLink link:calculationLink link:definitionLink 9955546 - Disclosure - Accounts receivable, unbilled revenue (contract assets) and unearned revenue or payments on account (contract liabilities) - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955546 - Disclosure - Accounts receivable, unbilled revenue (contract assets) and unearned revenue or payments on account (contract liabilities) - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955547 - Disclosure - Allowance for credit losses (Details) link:presentationLink link:calculationLink link:definitionLink 9955548 - Disclosure - Business combinations - KCR S.A. Group Acquisition (Details) link:presentationLink link:calculationLink link:definitionLink 9955549 - Disclosure - Business combinations - HumanFirst Inc. (Details) link:presentationLink link:calculationLink link:definitionLink 9955550 - Disclosure - Business combinations - BioTel Research LLC Acquisition (Details) link:presentationLink link:calculationLink link:definitionLink 9955551 - Disclosure - Business combinations - Oncacare Acquisition (Details) link:presentationLink link:calculationLink link:definitionLink 9955552 - Disclosure - Business combinations - PRA Health Sciences, Inc. Acquisition (Details) link:presentationLink link:calculationLink link:definitionLink 9955553 - Disclosure - Business combinations - Transaction and Integration Related Costs (Details) link:presentationLink link:calculationLink link:definitionLink 9955554 - Disclosure - Fair value - Schedule of Fair Value of Major Classes of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) link:presentationLink link:calculationLink link:definitionLink 9955555 - Disclosure - Fair value - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955556 - Disclosure - Investments in equity (Details) link:presentationLink link:calculationLink link:definitionLink 9955557 - Disclosure - Property, plant and equipment, net - Schedule of Carrying Amount of Property, Plant and Equipment (Details) link:presentationLink link:calculationLink link:definitionLink 9955558 - Disclosure - Property, plant and equipment, net - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955559 - Disclosure - Goodwill - Schedule of Change in Carrying Amount of Goodwill (Details) link:presentationLink link:calculationLink link:definitionLink 9955560 - Disclosure - Goodwill - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955561 - Disclosure - Intangible assets - Schedule of Carrying Amount of Intangible Assets (Details) link:presentationLink link:calculationLink link:definitionLink 9955562 - Disclosure - Intangible assets - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955563 - Disclosure - Intangible assets - Schedule of Future Intangible Asset Amortization Expense (Details) link:presentationLink link:calculationLink link:definitionLink 9955564 - Disclosure - Other liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 9955565 - Disclosure - Bank credit lines, loan facilities and notes - Schedule of Debt Outstanding (Details) link:presentationLink link:calculationLink link:definitionLink 9955566 - Disclosure - Bank credit lines, loan facilities and notes - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955567 - Disclosure - Bank credit lines, loan facilities and notes - Schedule of Financing Costs (Details) link:presentationLink link:calculationLink link:definitionLink 9955568 - Disclosure - Bank credit lines, loan facilities and notes - Schedule of Contractual Maturities of Debt Obligations (Details) link:presentationLink link:calculationLink link:definitionLink 9955569 - Disclosure - Bank credit lines, loan facilities and notes - Schedule of Principal Repayments (Details) link:presentationLink link:calculationLink link:definitionLink 9955570 - Disclosure - Bank credit lines, loan facilities and notes - Schedule of Movement on Debt Instrument (Details) link:presentationLink link:calculationLink link:definitionLink 9955571 - Disclosure - Derivatives (Details) link:presentationLink link:calculationLink link:definitionLink 9955572 - Disclosure - Derivatives - Effect of Derivative Financial Instruments on Statement of Financial Position (Details) link:presentationLink link:calculationLink link:definitionLink 9955573 - Disclosure - Operating Leases - Schedule of Lease Costs (Details) link:presentationLink link:calculationLink link:definitionLink 9955574 - Disclosure - Operating Leases - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955575 - Disclosure - Operating Leases - Schedule of Future Minimum Lease Payments Under Non-Cancelable Leases (Details) link:presentationLink link:calculationLink link:definitionLink 9955575 - Disclosure - Operating Leases - Schedule of Future Minimum Lease Payments Under Non-Cancelable Leases (Details) link:presentationLink link:calculationLink link:definitionLink 9955576 - Disclosure - Non-current other liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 9955577 - Disclosure - Commitments and contingencies (Details) link:presentationLink link:calculationLink link:definitionLink 9955578 - Disclosure - Share Capital - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955579 - Disclosure - Share Capital - Schedule of Shares Redeemed Under Buyback Program (Details) link:presentationLink link:calculationLink link:definitionLink 9955580 - Disclosure - Restructuring Charges - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955581 - Disclosure - Restructuring Charges - Schedule of Restructuring Charges (Details) link:presentationLink link:calculationLink link:definitionLink 9955582 - Disclosure - Restructuring Charges - Schedule of Details of Movement in Restructuring Charges (Details) link:presentationLink link:calculationLink link:definitionLink 9955583 - Disclosure - Income Taxes - Schedule of Components of Income Before Income Tax Expense (Details) link:presentationLink link:calculationLink link:definitionLink 9955584 - Disclosure - Income Taxes - Schedule of Components of Income Tax Expense (Details) link:presentationLink link:calculationLink link:definitionLink 9955585 - Disclosure - Income Taxes - Schedule of Reconciliation of Effective Tax Rate (Details) link:presentationLink link:calculationLink link:definitionLink 9955586 - Disclosure - Income Taxes - Schedule of Consolidated Reported Income Tax Expense Differed From Statutory Rate (Details) link:presentationLink link:calculationLink link:definitionLink 9955587 - Disclosure - Income Taxes - Schedule of Tax Effects of Temporary Differences that Give Rise to Significant Portions of Deferred Tax Assets and Deferred Tax Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 9955588 - Disclosure - Income Taxes - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955589 - Disclosure - Income Taxes - Schedule of Expected Expiry Dates of NOL's (Details) link:presentationLink link:calculationLink link:definitionLink 9955590 - Disclosure - Income Taxes - Schedule of Reconciliation of Beginning and Ending Amount of Total Unrecognized Tax Benefits (Details) link:presentationLink link:calculationLink link:definitionLink 9955591 - Disclosure - Income Taxes - Schedule of Reconciliation of Income Taxes Paid (Net of Refunds Received) (Details) link:presentationLink link:calculationLink link:definitionLink 9955592 - Disclosure - Equity Incentive Schemes and Stock Compensation Charges - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955593 - Disclosure - Equity Incentive Schemes and Stock Compensation Charges - Schedule of Transactions for Share Option Plans (Details) link:presentationLink link:calculationLink link:definitionLink 9955594 - Disclosure - Equity Incentive Schemes and Stock Compensation Charges - Schedule of Weighted Average Fair Values and Assumptions Used (Details) link:presentationLink link:calculationLink link:definitionLink 9955595 - Disclosure - Equity Incentive Schemes and Stock Compensation Charges - Schedule of RSU and PSU Activity (Details) link:presentationLink link:calculationLink link:definitionLink 9955596 - Disclosure - Equity Incentive Schemes and Stock Compensation Charges - Schedule of Stock Compensation Expense (Details) link:presentationLink link:calculationLink link:definitionLink 9955597 - Disclosure - Business Segment and Geographical Information - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955598 - Disclosure - Business Segment and Geographical Information - Schedule of Distribution of Revenue by Geographical Area (Details) link:presentationLink link:calculationLink link:definitionLink 9955599 - Disclosure - Business Segment and Geographical Information - Schedule of Distribution of Income from Operations by Geographical Area (Details) link:presentationLink link:calculationLink link:definitionLink 9955600 - Disclosure - Business Segment and Geographical Information - Schedule of Distribution of Long-Lived Assets, Net by Geographic Area (Details) link:presentationLink link:calculationLink link:definitionLink 9955601 - Disclosure - Net Income Per Ordinary Share - Schedule of Reconciliation of Number of Shares Used in Computation of Basic and Diluted Net Income Per Ordinary Share (Details) link:presentationLink link:calculationLink link:definitionLink 9955602 - Disclosure - Net Income Per Ordinary Share - Schedule of Reconciliation of Net Income Attributable to the Group (Details) link:presentationLink link:calculationLink link:definitionLink 9955603 - Disclosure - Accumulated Other Comprehensive Loss (Details) link:presentationLink link:calculationLink link:definitionLink 9955604 - Disclosure - Supplemental Disclosure of Cash Flow Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955605 - Disclosure - Related Parties (Details) link:presentationLink link:calculationLink link:definitionLink 9955606 - Disclosure - Subsequent Events (Details) link:presentationLink link:calculationLink link:definitionLink