Summary of Significant Accounting Policies	3 Months Ended
Summary of Significant Accounting Policies	Mar. 31, 2023
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies (a)Basis of Preparation and Principles of Consolidation The unaudited consolidated financial statements have been prepared in conformity with United States generally accepted accounting principles (“U.S. GAAP”) for interim financial information, the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by U.S. GAAP for annual financial statements and therefore should be read in conjunction with the audited consolidated financial statements and footnotes thereto included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2022. The unaudited consolidated financial statements reflect all adjustments (of a normal and recurring nature) that management considers necessary for a fair presentation of such statements for the interim periods presented. The unaudited consolidated statements of income for the interim periods presented are not necessarily indicative of the results for the full year or for any subsequent period. The accompanying unaudited consolidated financial statements include the financial statements of ExlService Holdings and all of its subsidiaries. The standalone financial statements of subsidiaries are fully consolidated on a line-by-line basis. Intra-group balances and transactions, and gains and losses arising from intra-group transactions, are eliminated while preparing consolidated financial statements. The Company’s investments in equity affiliates are initially recorded at cost and any excess purchase consideration paid over proportionate share of the fair value of the net assets of the investee at the acquisition date is recognized as goodwill. The proportionate share of net income or loss of the investee after its acquisition is recognized in the unaudited consolidated statements of income. Accounting policies of the respective individual subsidiaries and equity affiliates are aligned wherever necessary, so as to ensure consistency with the accounting policies that are adopted by the Company under U.S. GAAP. (b)Use of Estimates The preparation of the unaudited consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the unaudited consolidated financial statements and the unaudited consolidated statements of income during the reporting period. Although these estimates are based on management’s best assessment of the current business environment, actual results may be different from those estimates. The significant estimates and assumptions that affect the unaudited consolidated financial statements include, but are not limited to, estimates of the fair value of the identifiable intangible assets and contingent consideration, purchase price allocation, including revenue projections and the discount rate applied within the discounted cash flow model for business acquisitions, credit risk of customers, the nature and timing of the satisfaction of performance obligations, the standalone selling price of performance obligations, and variable consideration in a customer contract, expected recoverability from customers with contingent fee arrangements, estimated costs to complete fixed price contracts, recoverability of dues from statutory authorities, assets and obligations related to employee benefit plans, deferred tax valuation allowances, income-tax uncertainties and other contingencies, valuation of derivative financial instruments, stock-based awards, and debt instruments, assumptions used to calculate stock-based compensation expense, assumptions used to determine the incremental borrowing rate to calculate lease liabilities and right-of-use (“ROU”) assets, lease term to calculate amortization of ROU, depreciation and amortization periods, and recoverability of long-lived assets, goodwill and intangibles. (c) Recent Accounting Pronouncements In March 2023, the Financial Accounting Standard Board (“FASB”) issued Accounting Standard Update (“ASU”) No. 2023-01, Leases (“ASC Topic 842”): Common Control Arrangements. This ASU provides guidance in ASC Topic 842 that leasehold improvements associated with common control leases should be (i) amortized by the lessee over the useful life of the leasehold improvements to the common control group, regardless of the lease term, as long as the lessee controls the use of the underlying asset through a lease, and (ii) accounted for as a transfer between entities under common control through an adjustment to equity if and when the lessee no longer controls the use of the underlying asset. The ASU is effective for fiscal years beginning after December 15, 2023. Early adoption is permitted for both interim and annual financial statements that have not yet been issued. When adopted in an interim period, it must be adopted from the beginning of the year that includes that interim period. The Company is currently evaluating the impact of this ASU on its consolidated financial statements. (d) Recently adopted Accounting Pronouncements In October 2021, FASB issued ASU No. 2021-08, Business Combinations (“ASC Topic 805”): Accounting for Contract Assets and Contract Liabilities from Contracts with Customers. This ASU provides guidance in ASC Topic 805 to require the acquirer entity to recognize and measure contract assets and contract liabilities acquired in a business combination in accordance with ASC Topic 606, Revenue from Contract with Customers, as if it had originated the contracts. Generally, this should result in an acquirer recognizing and measuring the acquired contract assets and contract liabilities consistent with how they were recognized and measured in the acquiree’s financial statements, if the acquiree prepared financial statements in accordance with U.S. GAAP. The ASU is effective for fiscal years beginning after December 15, 2022. An entity may early adopt the ASU including adoption in an interim period, with retrospective application to all business combinations within the fiscal year that includes such interim period. The adoption of this ASU is applicable for future business combinations.