Commitments and Contingencies | Commitments and Contingencies Legal Proceedings The Company is party to legal proceedings incidental to its business. While the Company's management currently believes the ultimate outcome of these proceedings, individually and in the aggregate, will not have a material adverse effect on the Company's consolidated financial statements, litigation is subject to inherent uncertainties. Were an unfavorable ruling to occur, there exists the possibility of a material adverse impact on the Company's financial condition and results of operations. On December 1, 2017, the first of two virtually identical actions alleging federal securities law claims was filed against the Company and certain of its officers on behalf of a putative class of its shareholders. The first action, captioned Bermudez v. INC Research, Inc., et al, No. 17-09457 (S.D.N.Y.) in the Southern District of New York, names as defendants the Company, Michael Bell, Alistair MacDonald, Michael Gilbertini, and Gregory S. Rush (the "Bermudez action"), and the second action, Vaitkuvienë v. Syneos Health, Inc., et al, No. 18-0029 (E.D.N.C.) in the Eastern District of North Carolina, filed on January 25, 2018 (the "Vaitkuvienë action"), names as defendants the Company, Alistair MacDonald, and Gregory S. Rush (the "Initial Defendants"). Both complaints allege similar claims under Section 10(b) and Section 20(a) of the Securities Exchange Act of 1934 on behalf of a putative class of purchasers of the Company's common stock between May 10, 2017 and November 8, 2017 and November 9, 2017. The complaints allege that the Company published inaccurate or incomplete information regarding, among other things, the financial performance and business outlook for inVentiv’s business prior to the Merger and with respect to the combined company following the Merger. On January 30, 2018, two alleged shareholders separately filed motions seeking to be appointed lead plaintiff and approving the selection of lead counsel. On March 30, 2018, Plaintiff Bermudez filed a notice of voluntary dismissal of the Bermudez action, without prejudice, and as to all defendants. On May 29, 2018, the Court in the Vaitkuvienë action appointed the San Antonio Fire & Police Pension Fund and El Paso Firemen & Policemen’s Pension Fund as Lead Plaintiffs and, on June 7, 2018, the Court entered a schedule providing for, among other things, Lead Plaintiffs to file an amended complaint by July 23, 2018 (later extended to July 30, 2018). Lead Plaintiffs filed their amended complaint on July 30, 2018, which also includes a claim against the Initial Defendants, as well as each member of the board of directors at the time of the INC Research - inVentiv Health merger vote in July 2017 (the “Defendants”), contending that the inVentiv merger proxy was misleading under Section 14(a) of the Act. Lead Plaintiffs seek, among other things, orders (i) declaring that the lawsuit is a proper class action and (ii) awarding compensatory damages in an amount to be proven at trial, including interest thereon, and reasonable costs and expenses incurred in this action, including attorneys’ fees and expert fees, to Lead Plaintiffs and other class members. Defendants filed a Motion to Dismiss Plaintiffs’ Amended Complaint on September 20, 2018. Lead Plaintiffs filed a Response in Opposition to such motion on November 21, 2018, and Defendants filed a Reply to such response on December 5, 2018. On May 23, 2019, Lead Plaintiffs filed a Notice of Filings in Related Case regarding the New Jersey shareholder action filed on March 1, 2019 described below, pending before the United States District Court for the District of New Jersey (the “New Jersey Action”), and Defendants filed their response on May 31, 2019. On September 26, 2019, the Court ordered, among other things, that this action is stayed in light of the New Jersey Action. On March 23, 2020, Defendants filed a Notice of Disposition of a Related Action, notifying the Court that the New Jersey Action was dismissed and requesting that the stay in this action should be lifted. The Company and the other defendants deny the allegations in these complaints and intend to defend vigorously against these claims. On March 1, 2019, a complaint was filed in the United States District Court for the District of New Jersey on behalf of a putative class of shareholders who purchased the Company's common stock during the period between May 10, 2017 and February 27, 2019. The action, captioned Murakami v. Syneos Health, Inc. et al, No. 19-7377 (D.N.J.), named the Company and certain of its executive officers as defendants and alleged violations of the Securities Exchange Act of 1934, as amended, based on allegedly false or misleading statements about its business, operations, and prospects. The plaintiffs sought awards of compensatory damages, among other relief, and their costs and attorneys’ and experts’ fees. On March 28, 2019, Lead Plaintiffs in the Vaitkuvienë action filed a motion to intervene and to transfer this action to the Eastern District of North Carolina, and the Company filed its response on April 22, 2019. On April 30, 2019, a shareholder filed a motion seeking to be appointed lead plaintiff and approving the selection of lead counsel. On October 16, 2019, the Court ordered that Plaintiff, by November 8, 2019, file proof of service of the Complaint in Compliance with Rule 4, or otherwise show cause why the action should not be dismissed for failure to properly serve Defendants (the "Order to Show Cause"). The Court further ordered that the action is stayed and that both motions are administratively terminated pending the Court's resolution of the Order to Show Cause. Plaintiff filed a response to the Order to Show Cause on November 8, 2019, and the Company and the other defendants filed a response on November 20, 2019. On March 20, 2020, the Court dismissed this action without prejudice for failure to serve defendants within the time period required by law. The Company is presently unable to predict the duration, scope, or result of the Vaitkuvienë action, or any other related lawsuit. As such, the Company is presently unable to develop a reasonable estimate of a possible loss or range of losses, if any, related to this matter. While the Company intends to defend the putative class action litigation vigorously, the outcome of such litigation or any other litigation is necessarily uncertain. The Company could be forced to expend significant resources in the defense of this lawsuit or future ones, and it may not prevail. As such, these matters could have a material adverse effect on the Company's business, annual, or interim results of operations, cash flows, or its financial condition. Assumed Contingent Tax-Sharing Obligations As a result of the Merger, the Company assumed contingent tax-sharing obligations arising from inVentiv Health, Inc.'s 2016 merger with Double Eagle Parent, Inc. As of March 31, 2020 and December 31, 2019, the estimated fair value of the assumed contingent tax-sharing obligations was $6.4 million and $32.7 million, respectively. Contingent Earn-out Liability In connection with the acquisition of Kinapse Topco Limited ("Kinapse") in August 2018, the Company recorded a contingent earn-out liability to be paid based on Kinapse meeting revenue targets as of March 31, 2021. The estimated fair value of the contingent earn-out liability was $4.6 million as of December 31, 2019 and was included in other long-term liabilities in the condensed consolidated balance sheet. During the three months ended March 31, 2020, the Company adjusted the fair value of the contingent earn-out liability to zero to reflect the updated probability of achievement of the revenue targets. The change in fair value of the earn-out liability was recorded in transaction and integration-related expenses in the condensed consolidated statement of operations. |