Genpact Limited (G) 10-K 1 Mar 18 2017 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2017	Feb. 16, 2018	Jun. 30, 2017
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	FY
Trading Symbol	G
Entity Registrant Name	GENPACT LTD
Entity Central Index Key	1,398,659
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		193,479,240
Entity Public Float			$ 3,746,275,838

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current assets
Cash and cash equivalents	$ 504,468	$ 422,623
Accounts receivable, net	693,085	615,265
Prepaid expenses and other current assets	236,342	189,149
Total current assets	1,433,895	1,227,037
Property, plant and equipment, net	207,030	193,218
Deferred tax assets	76,929	70,143
Investment in equity affiliates	886	4,800
Intangible assets, net	131,590	78,946
Goodwill	1,337,122	1,069,408
Other assets	262,169	242,328
Total assets	3,449,621	2,885,880
Current liabilities
Short-term borrowings	170,000	160,000
Current portion of long-term debt	39,226	39,181
Accounts payable	15,050	9,768
Income taxes payable	30,026	24,159
Accrued expenses and other current liabilities	584,482	498,247
Total current liabilities	838,784	731,355
Long-term debt, less current portion	1,006,687	698,152
Deferred tax liabilities	6,747	2,415
Other liabilities	168,609	162,790
Total liabilities	2,020,827	1,594,712
Redeemable non-controlling interest	4,750	4,520
Shareholders' equity
Preferred shares, $0.01 par value, 250,000,000 authorized, none issued
Common shares, $0.01 par value, 500,000,000 authorized, 198,794,052 and 192,825,207 issued and outstanding as of December 31, 2016 and December 31, 2017, respectively	1,924	1,984
Additional paid-in capital	1,421,368	1,384,468
Retained earnings	355,982	358,121
Accumulated other comprehensive income (loss)	(355,230)	(457,925)
Total equity	1,424,044	1,286,648
Commitments and contingencies
Total liabilities, redeemable non-controlling interest and equity	$ 3,449,621	$ 2,885,880

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2017	Dec. 31, 2016
Statement Of Financial Position [Abstract]
Preferred shares, par value	$ 0.01	$ 0.01
Preferred shares, authorized	250,000,000	250,000,000
Preferred shares, issued	0	0
Common shares, par value	$ 0.01	$ 0.01
Common shares, authorized	500,000,000	500,000,000
Common shares, issued	192,825,207	198,794,052
Common shares, outstanding	192,825,207	198,794,052

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
Net revenues	$ 2,736,929	$ 2,570,756	$ 2,461,044
Cost of revenue	1,683,704	1,554,707	1,493,547
Gross profit	1,053,225	1,016,049	967,497
Operating expenses:
Selling, general and administrative expenses	689,847	653,029	608,114
Amortization of acquired intangible assets	36,412	27,183	28,513
Other operating (income) expense, net	(1,661)	(4,940)	(3,322)
Income from operations	328,627	340,777	334,192
Foreign exchange gains (losses), net	1,996	2,630	5,269
Interest income (expense), net	(31,735)	(16,184)	(31,267)
Other income (expense), net	26,238	10,120	4,360
Income before equity-method investment activity, net and income tax expense	325,126	337,343	312,554
Equity-method investment activity, net	(4,543)	(7,698)	(10,800)
Income before income tax expense	320,583	329,645	301,754
Income tax expense	59,742	62,098	61,937
Net income	260,841	267,547	239,817
Net loss attributable to redeemable non-controlling interest	2,270	2,137
Net income attributable to Genpact Limited shareholders	263,111	269,684	239,817
Net income available to Genpact Limited common shareholders	$ 263,111	$ 269,684	$ 239,817
Earnings per common share attributable to Genpact Limited common shareholders
Basic	$ 1.36	$ 1.30	$ 1.11
Diluted	$ 1.34	$ 1.28	$ 1.09
Weighted average number of common shares used in computing earnings per common share attributable to Genpact Limited common shareholders
Basic	193,864,755	206,861,536	216,606,542
Diluted	197,049,552	210,126,023	219,145,044

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net income (loss)	$ 260,841	$ 267,547	$ 239,817
Other comprehensive income (loss):
Net income (loss) on cash flow hedging derivatives, net of taxes (Note 7)	12,611	43,742	22,880
Retirement benefits, net of taxes	3,787
Other comprehensive income (loss)			(38,801)
Genpact Limited Shareholders
Net income (loss)	263,111	269,684	239,817
Other comprehensive income (loss):
Currency translation adjustments	93,871	(46,340)	(64,504)
Net income (loss) on cash flow hedging derivatives, net of taxes (Note 7)	12,611	43,742	22,880
Retirement benefits, net of taxes	(3,787)	(4,042)	2,823
Other comprehensive income (loss)	102,695	(6,640)	(38,801)
Comprehensive income (loss)	365,806	263,044	$ 201,016
Redeemable Non-controlling interest
Net income (loss)	(2,270)	(2,137)
Other comprehensive income (loss):
Currency translation adjustments	(341)	104
Other comprehensive income (loss)	(341)	104
Comprehensive income (loss)	$ (2,611)	$ (2,033)

Consolidated Statements of Equi

Consolidated Statements of Equity and Redeemable Non-controlling Interest - USD ($) $ in Thousands	Total	Common shares	Additional Paid- in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Redeemable non-controlling interest	Total Equity
Beginning balance, value at Dec. 31, 2014	$ 1,285,136	$ 2,184	$ 1,296,730	$ 398,706	$ (412,484)
Beginning balance, value (in shares) at Dec. 31, 2014		218,684,205
Issuance of common shares on exercise of options	$ 13,564	$ 14	13,550
Issuance of common shares on exercise of options (in shares)	1,428,605	1,428,605
Issuance of common shares under the employee stock purchase plan	$ 2,524	$ 1	2,523
Issuance of common shares under the employee stock purchase plan (in shares)		121,485
Net settlement on vesting of restricted share units	$ (2,306)	$ 3	(2,309)
Net settlement on vesting of restricted share units, shares		259,776
Net settlement on vesting of performance units		$ 8	(8)
Net settlement on vesting of performance units, shares	590	846,114
Stock repurchased and retired	$ (226,917)	$ (99)		(226,818)
Stock repurchased and retired, shares		(9,867,873)
Expenses related to stock purchase	(197)			(197)
Excess tax benefit on stock-based Compensation	6,560		6,560
Stock-based compensation expense	24,976		24,976
Comprehensive income:
Net income (loss)	239,817			239,817			$ 239,817
Other comprehensive income (loss)	(38,801)				(38,801)		(38,801)
End balance, value at Dec. 31, 2015	$ 1,304,356	$ 2,111	1,342,022	411,508	(451,285)		1,304,356
End balance, value (in shares) at Dec. 31, 2015		211,472,312
Issuance of common shares on exercise of options		$ 10	14,886				14,896
Issuance of common shares on exercise of options (in shares)	994,155	994,155
Issuance of common shares under the employee stock purchase plan		$ 1	3,331				3,332
Issuance of common shares under the employee stock purchase plan (in shares)		146,685
Net settlement on vesting of restricted share units		$ 1	(884)				(883)
Net settlement on vesting of restricted share units, shares		121,682
Stock repurchased and retired		$ (139)		(345,061)			(345,200)
Stock repurchased and retired, shares	(13,940,782)	(13,940,782)
Expenses related to stock purchase	$ (279)			(279)			(279)
Excess tax benefit on stock-based Compensation	0
Deferred tax assets recognized on early adoption of ASU 2016-09				24,912			24,912
Stock-based compensation expense			25,113				25,113
Acquisition of redeemable non controlling interest						$ 3,910
Change in fair value of redeemable non-controlling interest				(2,643)		2,643	(2,643)
Comprehensive income:
Net income (loss)	$ 267,547			269,684		(2,137)	269,684
Other comprehensive income (loss)					(6,640)	104	(6,640)
End balance, value at Dec. 31, 2016		$ 1,984	1,384,468	358,121	(457,925)	4,520	1,286,648
End balance, value (in shares) at Dec. 31, 2016	198,794,052	198,794,052
Issuance of common shares on exercise of options		$ 7	10,765				10,772
Issuance of common shares on exercise of options (in shares)	743,045	743,045
Issuance of common shares under the employee stock purchase plan		$ 2	4,754				4,756
Issuance of common shares under the employee stock purchase plan (in shares)		190,435
Net settlement on vesting of restricted share units		$ 1	(358)				(357)
Net settlement on vesting of restricted share units, shares		103,220
Net settlement on vesting of performance units		$ 7	(9,946)				(9,939)
Net settlement on vesting of performance units, shares	731,701	731,701
Stock repurchased and retired		$ (77)	(4,000)	(215,707)			(219,784)
Stock repurchased and retired, shares	(808,293)	(7,737,246)
Expenses related to stock purchase	$ (16)			(16)			(16)
Excess tax benefit on stock-based Compensation	0
Stock-based compensation expense			35,685				35,685
Change in fair value of redeemable non-controlling interest				(2,841)		2,841	(2,841)
Comprehensive income:
Net income (loss)	$ 260,841			263,111		(2,270)	263,111
Other comprehensive income (loss)					102,695	(341)	102,695
Dividend				(46,686)			(46,686)
End balance, value at Dec. 31, 2017		$ 1,924	$ 1,421,368	$ 355,982	$ (355,230)	$ 4,750	$ 1,424,044
End balance, value (in shares) at Dec. 31, 2017	192,825,207	192,825,207

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating activities
Net income attributable to Genpact Limited shareholders	$ 263,111	$ 269,684	$ 239,817
Net loss attributable to redeemable non-controlling interest	(2,270)	(2,137)
Net income	260,841	267,547	239,817
Adjustments to reconcile net income to net cash provided by (used for) operating activities:
Depreciation and amortization	58,503	54,553	54,286
Amortization of debt issuance costs (including loss on extinguishment of debt)	1,884	1,531	13,546
Amortization of acquired intangible assets	36,412	27,183	28,513
Write-down of intangible assets and property, plant and equipment	9,311	11,195	10,714
Reserve for doubtful receivables	9,819	7,282	2,449
Unrealized (gain) loss on revaluation of foreign currency asset/liability	(11,830)	1,717	(4,999)
Equity-method investment activity, net	4,543	7,698	10,800
Excess tax benefit on stock-based compensation			(6,560)
Stock-based compensation expense	35,685	25,113	24,976
Deferred income taxes	(10,391)	30,454	(18,713)
Loss (gain) on divestiture	5,668	(5,214)
Others, net	(4,785)	(41)	(238)
Change in operating assets and liabilities:
Increase in accounts receivable	(57,267)	(48,612)	(78,923)
Increase in prepaid expenses, other current assets and other assets	(28,381)	(62,852)	(32,602)
Decrease in accounts payable	(2,155)	(463)	(3,988)
Increase in accrued expenses, other current liabilities and other liabilities	46,581	27,977	69,606
Increase in income taxes payable	4,640	704	18,757
Net cash provided by operating activities	359,078	345,772	327,441
Investing activities
Purchase of property, plant and equipment	(57,231)	(81,926)	(62,173)
Payment for internally generated intangible assets	(16,441)	(6,846)
Proceeds from sale of property, plant and equipment	1,738	547	1,486
Investment in equity affiliates	(496)	(9,620)	(18,423)
Payment for business acquisitions, net of cash acquired	(284,822)	(45,162)	(21,363)
Proceeds from divestiture of business, net of cash divested	(4,738)	17,242
Net cash used for investing activities	(361,990)	(125,765)	(100,473)
Financing activities
Repayment of capital lease obligations	(2,708)	(1,793)	(2,035)
Payment of debt issuance cost	(2,630)		(6,584)
Proceeds from long-term debt	350,000		800,000
Repayment of long-term debt	(40,000)	(40,000)	(684,875)
Proceeds from short-term borrowings	295,000	200,000	1,451,500
Repayment of short-term borrowings	(285,000)	(61,500)	(1,565,000)
Proceeds from issuance of common shares under stock-based compensation plans	15,528	18,228	16,088
Payment for net settlement of stock-based awards	(10,296)	(769)	(7,194)
Payment of earn-out/deferred consideration	(6,219)	(1,485)	(230)
Dividend paid	(46,686)
Payment for stock purchased and retired	(219,784)	(345,200)	(226,917)
Payment for expenses related to stock purchase	(16)	(279)	(197)
Excess tax benefit on stock-based compensation			6,560
Net cash (used for) provided by financing activities	47,189	(232,798)	(218,884)
Effect of exchange rate changes	37,568	(15,493)	(18,965)
Net increase (decrease) in cash and cash equivalents	44,277	(12,791)	8,084
Cash and cash equivalents at the beginning of the period	422,623	450,907	461,788
Cash and cash equivalents at the end of the period	504,468	422,623	450,907
Supplementary information
Cash paid during the period for interest	27,853	17,860	20,950
Cash paid during the period for income taxes	66,238	46,731	72,102
Property, plant and equipment acquired under capital lease obligations	$ 2,318	$ 2,206	$ 1,656

Organization

Organization	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Organization	1. Organization The Company is a global professional services firm that drives digitally-led innovation and runs digitally-enabled intelligent operations for its clients, guided by its experience running thousands of processes for hundreds of Fortune Global 500 clients. The Company has over 78,000 employees serving clients in key industry verticals from more than 20 countries.

Summary of significant accounti

Summary of significant accounting policies	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Summary of significant accounting policies	2. Summary of significant accounting policies (a) Basis of preparation and principles of consolidation The accompanying consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (U.S. GAAP). The accompanying consolidated financial statements reflect all adjustments that management considers necessary for a fair presentation of the results of operations for these periods. The accompanying financial statements have been prepared on a consolidated basis and reflect the financial statements of Genpact Limited, a Bermuda company, and all of its subsidiaries that are more than 50% owned and controlled. When the Company does not have a controlling interest in an entity but exerts significant influence over the entity, the Company applies the equity method of accounting. All intercompany transactions and balances are eliminated in consolidation. Non-controlling interest in subsidiaries that is redeemable outside of the Company’s control for cash or other assets is reflected in the mezzanine section between liabilities and equity in the consolidated balance sheets at the redeemable value, which approximates fair value. Redeemable non-controlling interest is adjusted to its fair value at each balance sheet date. Any resulting increases or decreases in the estimated redemption amount are affected by corresponding charges to additional paid-in capital. The share of non-controlling interest in subsidiary earnings is reflected in net loss (income) attributable to redeemable non-controlling interest in the consolidated statements of income. (b) Use of estimates The preparation of consolidated financial statements in accordance with U.S. GAAP requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements. 2. Summary of significant accounting policies (Continued) Significant items subject to such estimates and assumptions include the useful lives of property, plant and equipment, intangibles and goodwill, revenue recognition, reserves for doubtful receivables, valuation allowances for deferred tax assets, the valuation of derivative financial instruments, measurements of stock-based compensation, assets and obligations related to employee benefits, and income tax uncertainties and other contingencies. Management believes that the estimates used in the preparation of the consolidated financial statements are reasonable. Although these estimates are based upon management’s best knowledge of current events and actions, actual results could differ from these estimates. Any changes in estimates are adjusted prospectively in the Company’s consolidated financial statements. (c) Revenue recognition The Company derives its revenue primarily from business process outsourcing and information technology services, which are provided on a time-and-material, transaction or fixed-price basis. The Company recognizes revenue when persuasive evidence of an arrangement exists, the sales price is fixed or determinable, services have been rendered and collectability is reasonably assured. Revenues from services rendered under time-and-materials and transaction-based contracts are recognized as the services are provided. The Company’s fixed-price contracts include contracts for application development, maintenance and support services. Revenues from these contracts are recognized ratably over the term of the agreement. The Company accrues for revenue and unbilled receivables for the services rendered between the last billing date and the balance sheet date. Customer contracts can also include incentive payments received for discrete benefits delivered to clients. Revenues relating to such incentive payments are recorded when the contingency is satisfied and the Company concludes the amounts are earned. Revenue from fixed-price contracts for the development of software and related services is recognized in accordance with the percentage-of-completion method. Guidance has been drawn from Financial Accounting Standards Board (“FASB”) guidance on Software—Revenue Recognition to account for revenue from fixed-price arrangements for software development and related services in conformity with FASB guidance on Revenue Recognition—Construction—Type and Production-Type Contracts. The input (effort or cost expended) method has been used to measure progress towards completion as there is a direct relationship between input and productivity. Provisions for estimated losses, if any, on uncompleted contracts are recorded in the period in which such losses become probable based on the current contract estimates. The Company has deferred the revenue and costs attributable to certain process transition activities with respect to its customers where such activities do not represent the culmination of a separate earnings process. Such revenue and costs are subsequently recognized ratably over the period in which the related services are performed. Further, the deferred costs are limited to the amount of the deferred revenues. Revenues are reported net of value-added tax, business tax and applicable discounts and allowances. Reimbursements of out-of-pocket expenses received from clients have been included as part of revenues. The Company enters into multiple-element revenue arrangements in which a client may purchase a combination of its services. Revenue from multiple-element arrangements is recognized, for each element, based on (1) the attainment of the delivery criterion; (2) its fair value, which is determined using the selling price hierarchy of vendor-specific objective evidence (“VSOE”) of fair value, third-party evidence or best estimated selling price, as applicable, and (3) its allocated selling price, which is based on the relative sales price method. 2. Summary of significant accounting policies (Continued) (d) Accounts receivable Accounts receivable are recorded at the invoiced or to be invoiced amount and do not bear interest. Amounts collected on trade accounts receivable are included in net cash provided by operating activities in the consolidated statements of cash flows. The Company maintains an allowance for doubtful accounts for estimated losses inherent in its accounts receivable portfolio. In establishing the required allowance, management considers historical losses adjusted to take into account current market conditions and clients’ financial conditions, the amount of receivables in dispute, and the current receivables’ aging and current payment patterns. Account balances are charged off against the allowance after all means of collection have been exhausted and the potential for recovery is considered remote. The Company does not have any off-balance-sheet credit exposure related to its clients. (e) Cash and cash equivalents Cash and cash equivalents consist of cash and bank balances and all highly liquid investments purchased with an original maturity of three months or less. (f) Short-term investments All liquid investments with an original maturity greater than 90 days but less than one year are considered to be short-term investments. Marketable short-term investments are classified and accounted for as available-for-sale investments. Available-for-sale investments are reported at fair value with changes in unrealized gains and losses recorded as a separate component of other comprehensive income (loss) until realized. Realized gains and losses on investments are determined based on the specific identification method and are included in “Other income (expense), net.” The Company does not hold these investments for speculative or trading purposes. (g) Property, plant and equipment, net Property, plant and equipment are stated at cost less accumulated depreciation and amortization. Expenditures for replacements and improvements are capitalized, whereas the costs of maintenance and repairs are charged to earnings as incurred. The Company depreciates and amortizes all property, plant and equipment using the straight-line method over the following estimated economic useful lives of the assets: Years Buildings 40 Furniture and fixtures 4 Computer equipment and servers 4 Plant, machinery and equipment 4 Computer software 4-7 Leasehold improvements Lesser of lease period or 10 Years Vehicles 3-4 The Company capitalizes certain computer software incurred in connection with developing or obtaining computer software for internal use when both the preliminary project stage is completed and it is probable that the software will be used as intended. Capitalized software costs include only (i) external direct costs of materials and services utilized in developing or obtaining computer software, (ii) compensation and related benefits for employees who are directly associated with the software project, and (iii) interest costs incurred while developing internal-use computer software. 2. Summary of significant accounting policies (Continued) Capitalized software costs are included in property, plant and equipment on the Company’s balance sheet and amortized on a straight-line basis when placed into service over the estimated useful lives of the software. Advances paid towards the acquisition of property, plant and equipment outstanding as of each balance sheet date and the cost of property, plant and equipment not put to use before such date are disclosed under “Capital work in progress. (h) Business combinations, goodwill and other intangible assets The Company accounts for its business combinations using the acquisition method of accounting in accordance with ASC 805, Business Combinations, by recognizing the identifiable tangible and intangible assets acquired and liabilities assumed, and any non-controlling interest in the acquired business, measured at their acquisition date fair values. Contingent consideration is included within the acquisition cost and is recognized at its fair value on the acquisition date. A liability resulting from contingent consideration is remeasured to fair value as of each reporting date until the contingency is resolved. Changes in fair value are recognized in earnings. All assets and liabilities of the acquired businesses, including goodwill, are assigned to reporting units. Acquisition-related costs are expensed as incurred under Selling, General and Administrative Expenses. Goodwill represents the cost of acquired businesses in excess of the fair value of identifiable tangible and intangible net assets purchased. Goodwill is not amortized but is tested for impairment at least on an annual basis on December 31, based on a number of factors, including operating results, business plans and future cash flows. The Company performs an assessment of qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not that the fair value of a reporting unit is less than its carrying amount. Based on the assessment of events or circumstances, the Company performs a quantitative assessment of goodwill impairment if it determines that it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If, based on the quantitative impairment analysis, the carrying value of the goodwill of a reporting unit exceeds the fair value of such goodwill, an impairment loss is recognized in an amount equal to the excess. In addition, the Company performs a qualitative assessment of goodwill impairment between annual tests if an event occurs or circumstances change that would more likely than not reduce the fair value of a reporting unit below its carrying amount. See Note 10 for information and related disclosures. Intangible assets including technology acquired / developed individually or with a group of other assets or in a business combination are carried at cost less accumulated amortization based on their estimated useful lives as follows: Customer-related intangible assets 1-14 years Marketing-related intangible assets 1-10 years Technology-related intangible assets 2-8 years Other intangible assets 3-5 years Intangible assets are amortized over their estimated useful lives using a method of amortization that reflects the pattern in which the economic benefits of the intangible assets are consumed or otherwise realized. In business combinations, where the fair value of identifiable tangible and intangible net assets purchased exceeds the cost of the acquired business, the Company recognizes the resulting gain under “Other operating (income) expense, net” in the Consolidated Statements of Income. 2. Summary of significant accounting policies (Continued) The Company also capitalizes certain software and technology development costs incurred in connection with developing or obtaining software or technology for sale/lease to customers when the initial design phase is completed and commercial and technological feasibility has been established. Any development cost incurred before technological feasibility is established is expensed as incurred as research and development costs. Technological feasibility is established upon completion of a detailed design program or, in its absence, completion of a working model. Capitalized software and technology costs include only (i) external direct costs of materials and services utilized in developing or obtaining software and technology and (ii) compensation and related benefits for employees who are directly associated with the project. Costs incurred in connection with developing or obtaining software or technology for sale/lease to customers which are under development and not put to use are disclosed under “intangible under development.” Capitalized software and technology costs are included in intangible assets under technology-related intangible assets on the Company’s balance sheet and amortized on a straight-line basis when placed into service over the estimated useful lives of the software and technology. (i) Impairment of long-lived assets Long-lived assets, including certain intangible assets, to be held and used are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of such assets may not be recoverable. Such assets are required to be tested for impairment if the carrying amount of the assets is higher than the future undiscounted net cash flows expected to be generated from the assets. The impairment amount to be recognized is measured as the amount by which the carrying value of the assets exceeds their fair value. The Company determines fair value by using a discounted cash flow approach. (j) Foreign currency The Company’s consolidated financial statements are reported in U.S. dollars, the Company’s functional currency. The functional currency for the Company’s subsidiaries organized in Europe, other than the United Kingdom, the Czech Republic, Luxembourg and one subsidiary in Poland, is the euro, and the functional currencies of the Company’s subsidiaries organized in Brazil, China, Colombia, Guatemala, India, Israel, Japan, Morocco, South Africa, the Philippines, the United Kingdom, Poland, the Czech Republic, Hong Kong, Singapore, Australia, Canada and United Arab Emirates are their respective local currencies. The functional currency of all other Company subsidiaries is the U.S. dollar. The translation of the functional currencies of the Company’s subsidiaries into U.S. dollars is performed for balance sheet accounts using the exchange rates in effect as of the balance sheet date and for revenues and expense accounts using a monthly average exchange rate prevailing during the respective period. The gains or losses resulting from such translation are reported as currency translation adjustments under other comprehensive income (loss), net, under accumulated other comprehensive income (loss) as a separate component of equity. Monetary assets and liabilities of each subsidiary denominated in currencies other than the subsidiary’s functional currency are translated into their respective functional currency at the rates of exchange prevailing on the balance sheet date. Transactions of each subsidiary in currencies other than the subsidiary’s functional currency are translated into the respective functional currencies at the average monthly exchange rate prevailing during the period of the transaction. The gains or losses resulting from foreign currency transactions are included in the consolidated statements of income. 2. Summary of significant accounting policies (Continued) (k) Derivative instruments and hedging activities In the normal course of business, the Company uses derivative financial instruments to manage fluctuations in foreign currency exchange rates and interest rate fluctuation. The Company purchases forward foreign exchange contracts to mitigate the risk of changes in foreign exchange rates on intercompany transactions and forecasted transactions denominated in foreign currencies and interest rate swaps to mitigate interest rate fluctuation risk on its indebtedness. The Company recognizes derivative instruments and hedging activities as either assets or liabilities in its consolidated balance sheets and measures them at fair value. Gains and losses resulting from changes in fair value are accounted for depending on the use of the derivative and whether it is designated and qualifies for hedge accounting. Changes in the fair values of derivatives designated as cash flow hedges are deferred and recorded as a component of other comprehensive income (loss) reported under accumulated other comprehensive income (loss) until the hedged transactions occur and are then recognized in the consolidated statements of income along with the underlying hedged item and disclosed as part of “Total net revenues,” “Cost of revenue,” “Selling, general and administrative expenses,” and “Interest expense,” as applicable. Changes in the fair value of derivatives not designated as hedging instruments and the ineffective portion of derivatives designated as cash flow hedges are recognized in the consolidated statements of income and are included in foreign exchange gains (losses), net, and other income (expense), net, respectively. With respect to derivatives designated as hedges, the Company formally documents all relationships between hedging instruments and hedged items, as well as its risk management objectives and strategy for undertaking various hedge transactions. The Company also formally assesses, both at the inception of the hedge and on a quarterly basis, whether each derivative is highly effective in offsetting changes in fair values or cash flows of the hedged item. If it is determined that a derivative or portion thereof is not highly effective as a hedge, or if a derivative ceases to be a highly effective hedge, the Company will prospectively discontinue hedge accounting with respect to that derivative. In all situations in which hedge accounting is discontinued and the derivative is retained, the Company continues to carry the derivative at its fair value on the balance sheet and recognizes any subsequent change in its fair value in the consolidated statements of income. When it is probable that a forecasted transaction will not occur, the Company discontinues hedge accounting and recognizes immediately, in foreign exchange gains (losses), net in the consolidated statements of income, the gains and losses attributable to such derivative that were accumulated in other comprehensive income (loss). (l) Income taxes The Company accounts for income taxes using the asset and liability method of accounting for income taxes. Under this method, income tax expense is recognized for the amount of taxes payable or refundable for the current year. In addition, deferred tax assets and liabilities are recognized for future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their tax bases and all operating loss and tax credit carry forwards, if any. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates or tax status is recognized in the statement of income in the period that includes the enactment date or the filing or approval date of the tax status change. Deferred tax assets are reduced by a valuation allowance if, based on the weight of available evidence, it is more likely than not that some portion or all of the deferred tax assets will not be realized. 2. Summary of significant accounting policies (Continued) The Company applies a two-step approach for recognizing and measuring the benefit of tax positions. The first step is to evaluate the tax position for recognition by determining, based on the technical merits, that the position will more likely than not be sustained upon examination. The second step is to measure the tax benefit as the largest amount of the tax benefit that is greater than 50 percent likely of being realized upon settlement. The Company includes interest and penalties related to unrecognized tax benefits within income tax expense. (m) Employee benefit plans Contributions to defined contribution plans are charged to consolidated statements of income in the period in which services are rendered by the covered employees. Current service costs for defined benefit plans are accrued in the period to which they relate. The liability in respect of defined benefit plans is calculated annually by the Company using the projected unit credit method. Prior service cost, if any, resulting from an amendment to a plan is recognized and amortized over the remaining period of service of the covered employees. The Company recognizes its liabilities for compensated absences dependent on whether the obligation is attributable to employee services already rendered, relates to rights that vest or accumulate and payment is probable and estimable. The Company records annual amounts relating to its defined benefit plans based on calculations that incorporate various actuarial and other assumptions, including discount rates, mortality, assumed rates of return, compensation increases and turnover rates. The Company reviews its assumptions on an annual basis or quarterly basis and makes modifications to the assumptions based on current rates and trends when it is appropriate to do so. The effect of modifications to those assumptions is recorded in other comprehensive income (loss) and amortized to net periodic cost over future periods using the corridor method. The Company believes that the assumptions utilized in recording its obligations under its plans are reasonable based on its experience and market conditions. (n) Stock-based compensation The Company recognizes and measures compensation expense for all stock-based awards based on the grant date fair value. For option awards, grant date fair value is determined under the option-pricing model (Black-Scholes-Merton) and for awards other than option awards, grant date fair value is determined on the basis of the fair market value of a Company common share on the date of grant of such awards. The Company recognizes compensation expense for stock-based awards net of estimated forfeitures. Stock-based compensation recognized in the consolidated statements of income for the years ended December 31, 2015, 2016 and 2017 is based on awards ultimately expected to vest. As a result, the expense has been reduced for estimated forfeitures. Forfeitures are estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from such estimates. (o) Accelerated Share Repurchase The Company entered into an accelerated share repurchase (“ASR”) agreement with a third-party financial institution to repurchase shares of the Company’s common stock. Under the ASR agreement, the Company paid a specified amount to the financial institution and received an initial delivery of shares. Upon an interim delivery and settlement of the ASR agreement, the financial institution delivered additional shares, with the final number of shares delivered determined with reference to the volume-weighted average price of the Company’s common stock over the term of the agreement, less an agreed-upon discount. The transactions are accounted for as equity transactions. All repurchased shares are retired. When the shares are received, there is an immediate reduction in the weighted-average common shares calculation for basic and diluted earnings per share. 2. Summary of significant accounting policies (Continued) (p) Government incentives The Company recognizes incentives in the consolidated statement of income to match them with the expenditures for which they are intended to compensate. Incentives are recognized in the income statement when there is reasonable assurance that the Company will comply with the conditions for their receipt and a reasonable expectation that the funds will be received. In certain circumstances, the receipt of an incentive may not be subject to any condition or requirement to incur further costs, in which case the incentive is recognized in the income statement for the period in which it becomes receivable. In the event that it becomes likely that the Company will be required to repay an incentive that has already been recognized, the Company makes a provision for the estimated liability. (q) Financial instruments and concentration of credit risk Financial instruments that potentially subject the Company to concentration of credit risk are reflected principally in cash and cash equivalents, derivative financial instruments and accounts receivable. The Company places its cash and cash equivalents and derivative financial instruments with corporations and banks with high investment grade ratings, limits the amount of credit exposure with any one corporation or bank and conducts ongoing evaluations of the creditworthiness of the corporations and banks with which it does business. To reduce its credit risk on accounts receivable, the Company conducts ongoing credit evaluations of its clients. GE accounted for 15% and 11% of the Company’s receivables as of December 31, 2016 and 2017, respectively. GE accounted for 19%, 14% and 10% of the Company’s revenues in the years ended December 31, 2015, 2016 and 2017, respectively. (r) Earnings (loss) per share Basic earnings per share is computed using the weighted average number of common shares outstanding during the period. Diluted earnings per share is computed using the weighted average number of common and dilutive common equivalent shares outstanding during the period. For the purposes of calculating diluted earnings per share, the treasury stock method is used for stock-based awards except where the results would be anti-dilutive. (s) Commitments and contingencies Liabilities for loss contingencies arising from claims, assessments, litigation, fines and penalties, and other sources are recorded when it is probable that a liability has been incurred and the amount of the assessment and/or remediation can be reasonably estimated. Legal costs incurred in connection with such liabilities are expensed as incurred. (t) Recently issued accounting pronouncements The authoritative bodies release standards and guidance which are assessed by management for impact on the company’s consolidated financial statements. The following recently released accounting standard has been adopted by the Company: In March 2016, the FASB issued ASU 2016-09, Compensation—Stock Compensation (Topic 718): Improvement to Employee Share-Based Payment Accounting. The new standard contains several amendments that will simplify the accounting for employee share-based payment transactions, including the accounting for income taxes, forfeitures, statutory tax withholding requirements, classification of awards as either equity or liabilities, and classification on the statement of cash flows. The changes in the new standard eliminate the requirement for excess tax benefits to be recognized in additional paid-in capital and tax deficiencies recognized either in income tax expense or in additional paid-in capital. In the quarter ended December 31, 2016, the Company elected to early adopt ASU 2016-09 effective January 1, 2016 and applied ASU 2016-09 using a modified retrospective approach. The treatment of forfeitures has not changed as the Company is electing to continue its current process of estimating the number of forfeitures. With the early adoption of ASU 2016-09, the Company has elected to present the cash flow statement on a prospective transition method and no prior periods have been adjusted. 2. Summary of significant accounting policies (Continued) In addition, the following recently released accounting standards have been adopted by the Company. Adoption of these standards did not have a material impact on the Company’s consolidated results of operations, cash flows, financial position or disclosures: Effective January 1, 2016, the Company adopted FASB ASU 2015-01 (Topic 225): Simplifying Income Statement Presentation by Eliminating the Concept of Extraordinary Items (“ASU 2015-01”). Such items are defined as transactions or events that are both unusual in nature and infrequent in occurrence, and, currently, are required to be presented separately in the income statement, net of income tax, after income from continuing operations. The changes eliminate the concept of an extraordinary item and, therefore, the presentation of such items will no longer be required. Notwithstanding this change, the Company will still be required to present and disclose a transaction or event that is both unusual in nature and infrequent in occurrence in the notes to the consolidated financial statements. Effective January 1, 2016, the Company adopted FASB ASU 2015-16 (Topic 805), Business Combinations (“ASU 2015-16”), which eliminates the requirement for an acquirer in a business combination to account for measurement-period adjustments retrospectively. The guidance requires that the acquirer shall recognize adjustments to provisional amounts that are identified during the measurement period in the reporting period in which the adjustment amounts are determined. Effective January 1, 2016, the Company adopted FASB ASU 2015-02. In February 2015, the FASB issued ASU No. 2015-02, Amendment to the Consolidation Analysis, which specifies changes to the analysis that an entity must perform to determine whether it should consolidate certain types of legal entities. These changes (i) modify the evaluation of whether limited partnerships and similar legal entities are variable interest entities or voting interest entities, (ii) eliminate the presumption that a general partner should consolidate a limited partnership, (iii) affect the consolidation analysis of reporting entities that are involved with variable interest entities, particularly those that have fee arrangements and related party relationships, and (iv) provide a scope exception from consolidation guidance for reporting entities with interests in legal entities that are required to comply with or operate in accordance with requirements that are similar to those in Rule 2a-7 of the Investment Company Act of 1940 for registered money market funds. Effective January 1, 2017, the Company adopted FASB ASU 2016-06, Derivatives and Hedging (Topic 815). The amendments in this update clarify the requirements for assessing whether contingent call (put) options that can accelerate the payment of principal on debt instruments are clearly and closely related to their debt hosts. An entity performing the assessment under the amendments in this update is required to assess the embedded call (put) options solely in accordance with a four-step decision sequence. 2. Summary of significant accounting policies (Continued) The following recently released accounting standards have not yet been adopted by the Company: In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers, which will replace most existing revenue recognition guidance in U.S. GAAP. The core principle of the ASU is that an entity should recognize revenue for the transfer of goods or services equal to the amount that it expects to be entitled to receive for those goods or services. The ASU requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgm

Business acquisitions

Business acquisitions	12 Months Ended
	Dec. 31, 2017
Business Combinations [Abstract]
Business acquisitions	3. Business acquisitions A. Certain acquisitions (a) TandemSeven, Inc. On September 5, 2017, the Company acquired 100% of the outstanding equity interest in TandemSeven, Inc. (“TandemSeven”), a Massachusetts corporation, for estimated total purchase consideration of $35,720, subject to adjustment for closing date working capital and indebtedness. This amount includes cash consideration of $31,866, net of cash acquired of $3,854, and a preliminary adjustment for working capital and indebtedness. In addition, the Company is evaluating certain tax positions, which, when determined, may result in the recognition of additional assets and liabilities as of the acquisition date. The measurement period will not exceed one year from the acquisition date. 3. Business acquisitions (Continued) In connection with the acquisition of TandemSeven, the Company recorded $2,000 in customer-related intangibles, $1,700 in marketing-related intangibles and $800 in technology-related intangible assets, which have a weighted average amortization period of two years. Goodwill arising from the acquisition amounted to $25,298, which has been allocated to the Company’s India reporting unit and is deductible for tax purposes. The goodwill represents primarily the acquired design expertise, operating synergies and other benefits expected to result from combining the acquired operations with those of the Company. Acquisition-related costs of $932 have been included in selling, general and administrative expenses as incurred. In connection with the transaction, the Company also acquired certain assets with a value of $7,388 and assumed certain liabilities amounting to $1,206 and recognized a net deferred tax liability of $260. The results of operations of the acquired business and the fair value of the acquired assets and assumed liabilities are included in the Company’s consolidated financial statements with effect from the date of the acquisition. (b) BrightClaim LLC and associated companies On May 3, 2017, the Company acquired 100% of the outstanding equity interest in each of BrightClaim LLC, a Delaware limited liability company, BrightServe LLC, a Georgia limited liability company, National Vendor LLC, a Delaware limited liability company, and BrightClaim Blocker, Inc., a Delaware corporation (collectively referred to as “BrightClaim”) for total purchase consideration of $56,461, subject to adjustment for closing date working capital, indebtedness and In connection with the acquisition of BrightClaim, the Company recorded $8,000 in customer-related intangibles, $3,200 in marketing-related intangibles, $2,200 in technology-related intangibles and $200 in other intangibles, which have a weighted average amortization period of four years. Goodwill arising from the acquisition amounted to $42,638, which has been allocated to the Company’s India reporting unit and is partially deductible for tax purposes. The goodwill represents primarily the capabilities, operating synergies and other benefits expected to result from combining the acquired operations with those of the Company. Acquisition-related costs of $1,563 have been included in selling, general and administrative expenses as incurred. In connection with the transaction, the Company also acquired certain assets with a value of $10,367, assumed certain liabilities amounting to $7,415, and recognized a net deferred tax liability of $2,728. The results of operations of the acquired business and the fair value of the acquired assets and assumed liabilities are included in the Company’s consolidated financial statements with effect from the date of the acquisition. 3. Business acquisitions (Continued) (c) RAGE Frameworks, Inc. On April 13, 2017, the Company acquired 100% of the outstanding equity interest in RAGE Frameworks, Inc. (“RAGE”), a Delaware corporation, for estimated total consideration of $125,089, subject to adjustment for closing date working capital and indebtedness. This amount includes cash consideration of $124,149, net of cash acquired of $1,605, and a preliminary adjustment for working capital and indebtedness. During the quarter ending December 31, 2017, the Company recorded certain measurement period adjustments. These measurement period adjustments did not have a significant impact on the Company’s consolidated statements of income, balance sheets or cash flows. In connection with the acquisition of RAGE, the Company recorded $1,600 in customer-related intangibles, $600 in marketing-related intangibles, $12,400 in technology-related intangible assets and $100 in other intangible assets, which have a weighted average amortization period of seven years. Goodwill arising from the acquisition amounted to $105,114, which has been allocated to the Company’s India reporting unit and is not deductible for tax purposes. The goodwill represents primarily the acquired digital and artificial intelligence capabilities, operating synergies and other benefits expected to result from combining the acquired operations with those of the Company. Acquisition-related costs of $881 have been included in selling, general and administrative expenses as incurred. In connection with the transaction, the Company also acquired certain assets with a value of $13,836 and assumed certain liabilities amounting to $9,654. The Company also recognized a net deferred tax asset of $1,094. The results of operations of the acquired business and the fair value of the acquired assets and assumed liabilities are included in the Company’s consolidated financial statements with effect from the date of the acquisition. (d) Other acquisitions in 2017 In 2017, the Company also completed five individually immaterial business acquisition transactions, namely the acquisition of a supply chain management delivery center in the U.S. from Kraft Foods Group Brands LLC (“U.S. Delivery Center”), the purchase of all of the outstanding equity interest in OnSource, LLC (“OnSource”), the purchase of the IT business of Birlasoft (“Birlasoft”), the purchase of the image processing business of Fiserv Solutions of Australia Pty Ltd. (“Fiserv”) and the purchase of all of the outstanding equity interest in Lease Dimensions, Inc. (“Lease Dimensions”). The aggregate total estimated consideration the Company paid to consummate these acquisitions was $87,586, subject to certain adjustments. This aggregate amount includes the estimated fair value of contingent earn-out consideration, cash consideration of $76,612, net of cash acquired of $254, and preliminary adjustments for closing date working capital, indebtedness, value transfer, seller transaction expenses and certain employee-related liabilities. The U.S. Delivery Center acquisition enhances the Company’s supply chain management capabilities for its clients in the consumer packaged goods industry. The OnSource acquisition brings incremental digital capabilities to the Company’s insurance service offerings. The Birlasoft transaction 3. Business acquisitions (Continued) expands the Company’s end-to-end capabilities for its clients in the healthcare and aviation industries. The Fiserv transaction strengthens the Company’s financial services portfolio and expands its Australia footprint. The Lease Dimensions acquisition enhances the Company’s capabilities in commercial lending and leasing. During the quarter ending December 31, 2017, the Company recorded certain measurement period adjustments with respect to the Birlasoft and Fiserv transactions. These measurement period adjustments did not have a significant impact on the Company’s consolidated statements of income, balance sheets or cash flows. The purchase agreement for the acquisition of the U.S. Delivery Center provides for contingent earn-out consideration ranging from $0 to $10,000, payable by the Company to the seller based on the achievement of certain milestones relative to the thresholds specified in the earn-out calculation. The purchase agreement for the Lease Dimensions acquisition provides for contingent earn-out consideration ranging from $0 to $3,000, payable by the Company to the sellers based on the future performance of the business relative to the thresholds specified in the earn-out calculation. In connection with these transactions, the Company recorded $33,494 in customer-related intangibles, $1,936 in marketing-related intangibles, $2,956 in technology-related intangibles and $100 in other intangibles, which have a weighted average amortization period of five years. Goodwill arising from these acquisitions amounted to $56,521. The goodwill represents primarily the capabilities, operating synergies and other benefits expected to result from combining the acquired operations with those of the Company. The following table sets forth, with respect to each of the five acquisitions, the acquisition date, goodwill reporting unit and the tax deductibility of the goodwill: Acquisition Acquisition date Goodwill reporting unit Tax deductibility of goodwill U.S. Delivery Center October 16, 2017 India Deductible OnSource July 18, 2017 India Deductible Birlasoft July 18, 2017 IT Services Deductible Fiserv May 11, 2017 India Non-deductible Lease Dimensions February 15, 2017 Americas Non-deductible Acquisition-related costs for these acquisitions, amounting to $2,369 in the aggregate, have been included in selling, general and administrative expenses as incurred. Through these transactions, the Company acquired assets with a value of $10,387, assumed liabilities amounting to $11,239, and recognized a net deferred tax liability of $6,570. The results of operations of the acquired businesses and the fair value of the acquired assets and assumed liabilities are included in the Company’s consolidated financial statements with effect from the respective dates of the acquisitions. (e) Endeavour Software Technologies Private Limited On April 13, 2016, the Company acquired 100% of the outstanding equity interest in Endeavour Software Technologies Private Limited (“Endeavour”), an Indian private limited company, for total consideration of $14,788. This amount includes the estimated fair value of the contingent earn-out consideration, cash consideration of $10,345, net of cash acquired of $2,373, and an adjustment for working capital and net debt. During the quarter ending March 31, 2017, the Company recorded certain measurement period adjustments. 3. Business acquisitions (Continued) performance relative to the thresholds specified in the earn-out calculation. This acquisition enhances the Company’s digital capabilities by adding critical end-to-end mobility services. In connection with the transaction, the Company recorded $800 in customer-related intangibles, $900 in marketing-related intangibles and $950 in other intangible assets, which have a weighted average amortization period of three years. Goodwill arising from the acquisition amounted to $8,936, which has been allocated to the Company’s India reporting unit and is not deductible for tax purposes. The goodwill represents primarily the capabilities in end-to-end mobility services, operating synergies and other benefits expected to result from combining the acquired operations with those of the Company. In connection with the transaction, the Company also acquired certain assets with a value of $5,854 and assumed certain liabilities amounting to $1,735. The results of operations of the acquired business and the fair value of the acquired assets and assumed liabilities are included in the Company’s consolidated financial statements with effect from the date of the acquisition. (f) On January 8, 2016, the Company acquired 51% of the outstanding equity interest in Strategic Sourcing Excellence LLC (“SSE”), a Delaware limited liability company. The total consideration paid by the Company to the selling equity holders for the acquired interest in SSE was $14,541. This amount includes the fair value of earn-out consideration, cash consideration of $2,550, and an adjustment for working capital, transaction expenses and indebtedness. During the quarter ending December 31, 2016, the Company recorded certain measurement period adjustments. The equity purchase agreement grants the Company a call option to purchase the remaining 49% equity interest in SSE, which option the Company had the right to exercise between January 1, 2018 and January 31, 2018. Since the Company did not exercise its call option during such period, the selling equity holders have the right to exercise a put option between March 1, 2018 and April 30, 2018 to require the Company to purchase their 49% interest in SSE at a price ranging from $2,450 to $2,950. This acquisition enhances the Company’s sourcing and procurement consulting domain expertise. Acquisition-related costs of $164 have been included in selling, general and administrative expenses as incurred. Through this transaction, the Company acquired assets with a value of $412 and assumed liabilities amounting to $617. The results of operations of the acquired business, the fair value of the acquired assets and assumed liabilities, and redeemable non-controlling interest are included in the Company’s Consolidated Financial Statements with effect from the date of the acquisition. In connection with the transaction, the Company recorded $300 in customer-related intangible assets with an amortization period of five years. Goodwill arising from the acquisition amounted to $14,445, which has been allocated to the Company’s India reporting unit and is deductible for tax purposes. The goodwill represents future economic benefits the Company expects to derive from its expanded presence in the sourcing and procurement consulting domains, operating synergies and other anticipated benefits of combining the acquired operations with those of the Company. 3. Business acquisitions (Continued) (g) PNMSoft Ltd. On August 4, 2016, the Company acquired 100% of the outstanding equity interest in PNMSoft Limited (“PNMSoft”), a company incorporated under the laws of Israel. The total purchase consideration paid by the Company to acquire PNMSoft is $35,341. This amount includes the estimated fair value of contingent earn-out consideration, cash consideration of $28,128, net of cash acquired of $2,853, and an adjustment for working capital, transaction expenses and net debt. During the quarter ending December 31, 2016, the Company recorded certain measurement period adjustments. In connection with this acquisition, the Company recorded $1,700 in customer-related intangibles, $1,630 in marketing-related intangibles and $5,110 in other intangible assets, which have a weighted average amortization period of two years. Goodwill arising from the acquisition amounted to $25,101, which has been allocated to the Company’s India reporting unit and is not deductible for tax purposes. The goodwill represents primarily the capabilities, operating synergies and other benefits expected to result from combining the acquired operations with those of the Company. Acquisition-related costs of $1,273 have been included in selling, general and administrative expenses as incurred. In connection with the transaction, the Company acquired assets with a value of $7,110, assumed liabilities amounting to $4,366 and recognized a net deferred tax liability of $944. The results of operations of the acquired business and the fair value of the acquired assets and assumed liabilities are included in the Company’s consolidated financial statements with effect from the date of the acquisition. B. Divestiture (a) A portion of IT support business in Europe In November 2017, the Company completed the sale of a portion of its legacy IT support business in Europe (the “Business”). Sale proceeds were $0. During the year ended December 31, 2017, the Business recorded net revenues of $4,546 and a net loss of $9,706. The Company recorded a loss of $5,668 in its consolidated statement of income in connection with the sale of the Business, calculated as follows: Net sale proceeds $ — Net assets of the business, including the translation impact thereof 5,569 Selling expenses 99 Loss on divestiture included in other income (expense), net $ 5,668 (b) Atyati Technologies Private Limited In September 2016, the Company completed the sale of its cloud-hosted technology platform for the Indian rural banking sector (“Atyati”), which the Company acquired in 2012. Net sale proceeds from the sale of Atyati were $17,155, net of selling expenses of $427 and cash divested of $854. During the year ended December 31, 2016, Atyati recorded net revenues of $14,958 and a net profit of $64. 3. Business acquisitions (Continued) The Company recorded a gain of $5,214 in its consolidated statement of income in connection with the sale of Atyati, calculated as follows: Net sale proceeds $ 17,155 Net assets of the business, including intangible assets, allocated goodwill and the translation impact thereof 11,941 Gain on divestiture included in other income (expense), net $ 5,214

Cash and cash equivalents

Cash and cash equivalents	12 Months Ended
	Dec. 31, 2017
Cash And Cash Equivalents [Abstract]
Cash and cash equivalents	4. Cash and cash equivalents As of December 31, 2016 2017 Cash and other bank balances $ 422,623 $ 504,468 Total $ 422,623 $ 504,468

Accounts receivable, net of res

Accounts receivable, net of reserve for doubtful receivables	12 Months Ended
	Dec. 31, 2017
Receivables [Abstract]
Accounts receivable, net of reserve for doubtful receivables	5. Accounts receivable, net of reserve for doubtful receivables The following table provides details of the Company’s reserve for doubtful receivables: Year ended December 31, 2015 2016 2017 Opening balance as of January 1 $15,192 $ 11,530 $ 15,519 Additions due to acquisitions — — 235 Additions charged to cost and expense 2449 7,282 9,819 Deductions/effect of exchange rate fluctuations (6,111 ) (3,293 ) (1,913 ) Closing balance $ 11,530 $ 15,519 $ 23,660 Accounts receivable were $630,784 and $716,745, and reserves for doubtful receivables were $15,519 and $23,660, resulting in net accounts receivable balances of $615,265 and $693,085 as of December 31, 2016 and 2017, respectively. In addition, accounts receivable due after one year amounting to $3,272 and $1,624 as of December 31, 2016 and 2017, respectively, are included under other assets in the consolidated balance sheets. Accounts receivable from related parties were $2,490 and $36 as of December 31, 2016 and 2017, respectively. There are no doubtful receivables in amounts due from related parties.

Fair value measurements

Fair value measurements	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Fair value measurements	6. Fair Value Measurements The Company measures certain financial assets and liabilities, including derivative instruments, at fair value on a recurring basis. The fair value measurements of these financial assets and liabilities were determined using the following inputs as of December 31, 2016 and 2017: As of December 31, 2016 Fair Value Measurements at Reporting Date Using Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Other Unobservable Inputs Total (Level 1) (Level 2) (Level 3) Assets Derivative instruments (Notes a, c) $ 55,386 $ — $ 55,386 $ — Total $ 55,386 $ — $ 55,386 $ — Liabilities Earn-out consideration (Notes b, d) $ 22,435 $ — $ — $ 22,435 Derivative instruments (Notes b, c) 17,353 — 17,353 — Total $ 39,788 $ — $ 17,353 $ 22,435 Redeemable non-controlling interest (Note e) $ 4,520 $ — $ — $ 4,520 As of December 31, 2017 Fair Value Measurements at Reporting Date Using Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Other Unobservable Inputs Total (Level 1) (Level 2) (Level 3) Assets Derivative instruments (Notes a, c) $ 73,098 $ — $ 73,098 $ — Total $ 73,098 $ — $ 73,098 $ — Liabilities Earn-out consideration (Notes b, d) $ 24,732 $ — $ — $ 24,732 Derivative instruments (Notes b, c) 18,188 — 18,188 — Total $ 42,920 $ — $ 18,188 $ 24,732 Redeemable non-controlling interest (Note e) $ 4,750 $ — $ — $ 4,750 (a) Included in prepaid expenses and other current assets and other assets in the consolidated balance sheets. (b) Included in accrued expenses and other current liabilities and other liabilities in the consolidated balance sheets. (c) The Company values its derivative instruments based on market observable inputs, including both forward and spot prices for the relevant currencies and interest rate indices for relevant interest rates. The quotes are taken from an independent market database. (d) The fair value of earn-out consideration, calculated as the present value of expected future payments to be made to the sellers of acquired businesses, was derived by estimating the future financial performance of the acquired businesses using the earn-out formula and performance targets specified in each purchase agreement and adjusting the result to reflect the Company’s estimate of the likelihood of achievement of such targets. Given the significance of the unobservable inputs, the valuations are classified in level 3 of the fair value hierarchy. 6. Fair Value Measurements (continued) (e) The Company’s estimate of the fair value of redeemable non-controlling interest as of December 31, 2017 is based on unobservable inputs considering the assumptions that market participants would make in pricing the obligation. Given the significance of the unobservable inputs, the valuation was classified in level 3 of the fair value hierarchy. Refer to Note 3—Business Acquisitions. The following table provides a roll-forward of the fair value of earn-out consideration categorized as level 3 in the fair value hierarchy for the years ended December 31, 2016 and 2017: As of December 31 2016 2017 Opening balance $ 22,820 $ 22,435 Earn-out consideration payable in connection with acquisitions 14,550 10,720 Payments made of earn-out consideration (1,611 ) (7,239 ) Change in fair value (note a) (14,869 ) (3,695 ) Other (note b) 1,545 2,511 Ending balance $ 22,435 $ 24,732 (a) Changes in the fair value of earn-out consideration are reported in other operating (income) expense, net in the consolidated statements of income. (b) Interest expense is included in interest income (expense), net and the impact of changes in foreign exchange is reported in foreign exchange gains (losses), net in the consolidated statements of income. The cumulative translation adjustment is reported as a component of other comprehensive income (loss).

Derivative financial instrument

Derivative financial instruments	12 Months Ended
	Dec. 31, 2017
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Derivative financial instruments	7. Derivative financial instruments The Company is exposed to the risk of rate fluctuations on foreign currency assets and liabilities and on foreign currency denominated forecasted cash flows. The Company has established risk management policies, including the use of derivative financial instruments to hedge foreign currency assets and liabilities and foreign currency denominated forecasted cash flows and interest rate risks. These derivative financial instruments are largely deliverable and non-deliverable forward foreign exchange contracts and interest rate swaps. The Company enters into these contracts with counterparties that are banks or other financial institutions, and the Company considers the risk of non-performance by such counterparties not to be material. The forward foreign exchange contracts and interest rate swaps mature over periods of up to 60 months and the forecasted transactions are expected to occur during the same periods. 7. Derivative financial instruments (Continued) The following table presents the aggregate notional principal amounts of outstanding derivative financial instruments together with the related balance sheet exposure: Notional principal amounts (note a) Balance sheet exposure asset (liability) (note b) As of December 31, 2016 As of December 31, 2017 As of December 31, 2016 As of December 31, 2017 Foreign exchange forward contracts denominated in: United States Dollars (sell) Indian Rupees (buy) $ 1,108,400 $ 1,289,400 $ 6,669 $ 54,398 United States Dollars (sell) Mexican Peso (buy) 9,120 9,000 (187 ) (441 ) United States Dollars (sell) Philippines Peso (buy) 70,050 76,650 (1,036 ) 69 Euro (sell) United States Dollars (buy) 138,613 170,542 9,180 (2,069 ) Pound Sterling (buy) United States Dollars (sell) — 24,041 — 253 Euro (sell) Romanian Leu (buy) 29,805 35,826 (152 ) (892 ) Japanese Yen (sell) Chinese Renminbi (buy) 77,267 60,768 (742 ) 1,918 Pound Sterling (sell) United States Dollars (buy) 104,142 80,871 14,228 (2,478 ) Australian Dollars (sell) United States Dollars (buy) 114,412 136,092 2,328 (5,180 ) Interest rate swaps (floating to fixed) 456,810 432,117 7,746 9,332 $ 38,034 $ 54,910 (a) Notional amounts are key elements of derivative financial instrument agreements but do not represent the amount exchanged by counterparties and do not measure the Company’s exposure to credit, foreign exchange, interest rate or other market risks. However, the amounts exchanged are based on the notional amounts and other provisions of the underlying derivative financial instrument agreements. (b) Balance sheet exposure is denominated in U.S. dollars and denotes the mark-to-market impact of the derivative financial instruments on the reporting date. FASB guidance on derivatives and hedging requires companies to recognize all derivative instruments as either assets or liabilities at fair value in the Balance Sheet. In accordance with the FASB guidance on derivatives and hedging, the Company designates foreign exchange forward contracts and interest rate swaps as cash flow hedges. Foreign exchange forward contracts are entered into to cover the effects of future exchange rate variability on forecasted revenue and purchases of services, and interest rate swaps are entered into to cover interest rate fluctuation risk. In addition to this program, the Company uses derivative instruments that are not accounted for as hedges under the FASB guidance in order to hedge foreign exchange risks related to balance sheet items, such as receivables and intercompany borrowings, that are denominated in currencies other than the Company’s underlying functional currency. 7. Derivative financial instruments (Continued) The fair values of the Company’s derivative instruments and their location in the Company’s financial statements are summarized in the table below: Cash flow hedges Non-designated As of December 31, 2016 As of December 31, 2017 As of December 31, 2016 As of December 31, 2017 Assets Prepaid expenses and other current assets $ 33,921 $ 43,557 $ 809 $ 4,635 Other assets $ 20,657 $ 24,906 $ — $ — Liabilities Accrued expenses and other current liabilities $ 4,540 $ 10,092 $ 237 $ 254 Other liabilities $ 12,576 $ 7,842 $ — $ — Cash flow hedges For derivative instruments that are designated and qualify as cash flow hedges, the effective portion of the gain (loss) on the derivative instrument is reported as a component of other comprehensive income (loss) and reclassified into earnings in the same period or periods during which the hedged transaction is recognized in the consolidated statements of income. Gains (losses) on the derivatives, representing either hedge ineffectiveness or hedge components excluded from the assessment of effectiveness, are recognized in earnings as incurred. In connection with cash flow hedges, the gains (losses) recorded as a component of other comprehensive income (loss), or OCI, and the related tax effects are summarized below: Year ended December 31, 2015 2016 2017 Before- Tax amount Tax (Expense) or Benefit Net of tax Amount Before- Tax amount Tax (Expense) or Benefit Net of tax Amount Before- Tax amount Tax (Expense) or Benefit Net of tax Amount Opening balance $ (66,786 ) $ 23,646 $ (43,140 ) $ (30,090 ) $ 9,830 $ (20,260 ) $ 37,461 $ (13,979 ) $ 23,482 Net gains (losses) reclassified into statement of income on completion of hedged transactions (42,106 ) 15,346 (26,760 ) (6,799 ) 409 (6,390 ) 54,494 (17,725 ) 36,769 Changes in fair value of effective portion of outstanding derivatives, net (5,410 ) 1,530 (3,880 ) 60,752 (23,400 ) 37,352 67,562 (18,182 ) 49,380 Gain (loss) on cash flow hedging derivatives, net 36,696 (13,816 ) 22,880 67,551 (23,809 ) 43,742 13,068 (457 ) 12,611 Closing balance $ (30,090 ) $ 9,830 $ (20,260 ) $ 37,461 $ (13,979 ) $ 23,482 $ 50,529 $ (14,436 ) $ 36,093 7. Derivative financial instruments (Continued) The gains or losses recognized in other comprehensive income (loss) and their effects on financial performance are summarized below: Derivatives in Cash Flow Hedging Relationships Amount of Gain (loss) recognized in OCI on Derivatives (Effective Portion) Location of Gain (loss) reclassified from OCI into Statement of Income (Effective Portion) Amount of Gain (loss) reclassified from OCI into Statement of Income (Effective Portion) Year ended December 31, Year ended December 31, 2015 2016 2017 2015 2016 2017 Forward foreign exchange contracts $ (5,410 ) $ 54,664 $ 66,037 Revenue $ 13,667 $ 12,859 $ 5,858 Interest rate swaps $ — $ 6,088 $ 1,525 Cost of revenue $ (44,634 ) $ (14,223 ) $ 37,849 Selling, general and administrative expenses $ (11,139 ) $ (3,765 ) $ 10,849 Interest expense $ — $ (1,670 ) $ (62 ) $ (5,410 ) $ 60,752 $ 67,562 $ (42,106 ) $ (6,799 ) $ 54,494 Gain (loss) recognized in income on the ineffective portion of derivatives and the amount excluded from effectiveness testing is $0 as of December 31, 2015, 2016 and 2017. Non-designated Hedges Derivatives not designated as hedging instruments Location of Gain (Loss) recognized in Statement of Income on Derivatives Amount of Gain (Loss) recognized in Statement of Income on Derivatives Year ended December 31, 2015 2016 2017 Forward foreign exchange contracts (Note a) Foreign exchange gains (losses), net $ 6,566 $ 2,921 $ 16,696 $ 6,566 $ 2,921 $ 16,696 (a) These forward foreign exchange contracts were entered into to hedge fluctuations in foreign exchange rates for recognized balance sheet items, such as receivables and intercompany borrowings, and were not originally designated as hedges under FASB guidance on derivatives and hedging. Realized gains (losses) and changes in the fair value of these derivatives are recorded in foreign exchange gains (losses), net in the consolidated statements of income.

Prepaid expenses and other curr

Prepaid expenses and other current assets	12 Months Ended
	Dec. 31, 2017
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]
Prepaid expenses and other current assets	8. Prepaid expenses and other current assets Prepaid expenses and other current assets consist of the following: As of December 31, 2016 2017 Advance income and non-income taxes $ 50,676 $ 51,832 Deferred transition costs 45,252 62,029 Derivative instruments 34,730 48,192 Prepaid expenses 22,222 16,944 Customer acquisition cost 11,126 19,327 Employee advances 6,880 5,014 Deposits 2,688 4,719 Advances to suppliers 10,059 2,705 Others 5,516 25,580 $ 189,149 $ 236,342

Property, plant and equipment,

Property, plant and equipment, net	12 Months Ended
	Dec. 31, 2017
Property Plant And Equipment [Abstract]
Property, plant and equipment, net	9. Property, plant and equipment, net Property, plant and equipment, net consist of the following: As of December 31, 2016 2017 Land $ 9,635 $ 10,209 Buildings 44,487 46,007 Furniture and fixtures 37,421 43,091 Computer equipment and servers 187,119 210,725 Plant, machinery and equipment 84,677 92,981 Computer software 119,648 137,459 Leasehold improvements 92,313 102,072 Vehicles 6,753 6,418 Capital work in progress 18,501 17,069 Property, plant and equipment, gross $ 600,554 $ 666,031 Less: accumulated depreciation, amortization and impairment (407,336 ) (459,001 ) Property, plant and equipment, net $ 193,218 $ 207,030 Depreciation expense on property, plant and equipment for the years ended December 31, 2015, 2016 and 2017 was $47,673, $45,826 and $44,909, respectively. Software amortization for the years ended December 31, 2015, 2016 and 2017 amounted to $9,114, $9,471 and $11,400, respectively. The depreciation and amortization expenses set forth above include the effect of the reclassification of foreign exchange (gains) losses related to the effective portion of foreign currency derivative contracts, amounting to $2,501, $744 and $(1,727) for the years ended December 31, 2015, 2016 and 2017, respectively. Property, plant and equipment, net include assets held under capital lease arrangements amounting to $3,183 and $3,302 as of December 31, 2016 and December 31, 2017, respectively. Depreciation expense in respect of these assets was $1,594, $1,564 and $1,682 for the years ended December 31, 2015, 2016 and 2017, respectively. During the year ended December 31, 2017, the Company tested for recoverability a group of assets, comprised of computer software and a technology-related intangible asset, as a result of a downward revision to the forecasted cash flows to be generated by this group of assets. Based on the results of its testing, the Company determined that the carrying value of the group of assets exceeded the estimated undiscounted cash flows and the Company recorded an $8,000 write-down to reduce the carrying value to its fair value. The Company used the income approach to determine the fair value of the group of assets for the purpose of calculating the charge. This write-down has been recorded in other operating (income) expenses, net in the consolidated statement of income and has been allocated to computer software and technology-related intangible assets, amounting to $5,760 and $2,240, respectively.

Goodwill and intangible assets

Goodwill and intangible assets	12 Months Ended
	Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill and intangible assets	10. Goodwill and intangible assets The following table presents the changes in goodwill for the years ended December 31, 2016 and 2017: As of December 31, 2016 2017 Opening balance $ 1,038,346 $ 1,069,408 Goodwill relating to acquisitions consummated during the period 51,535 229,745 Goodwill relating to divestitures during the period (2,226 ) — Impact of measurement period adjustments (59 ) (106 ) Effect of exchange rate fluctuations (18,188 ) 38,075 Closing balance $ 1,069,408 $ 1,337,122 Goodwill has been allocated to the following reporting units, which represent different business units of the Company, as follows: As of December 31, 2016 2017 India $ 493,084 $ 735,596 China 58,139 60,171 Europe 36,584 41,775 Americas 48,713 57,021 IT services 432,888 442,559 $ 1,069,408 $ 1,337,122 In the year ended December 31, 2017, in accordance with ASU 2011-08, the Company performed an assessment of qualitative factors to determine whether events or circumstances exist that may lead to a determination that it is more likely than not that the fair value of a reporting unit is less than its carrying amount. Based on such assessment, as at December 31, 2017, the Company concluded that it is not more likely than not that the fair values of all of the Company’s reporting units are less than their carrying amounts. In the year ended December 31, 2016, in accordance with ASU 2011-08, the Company performed an assessment of qualitative factors to determine whether events or circumstances exist that may lead to a determination that it is more likely than not that the fair value of a reporting unit is less than its carrying amount. Based on its assessment, the Company concluded that it is not more likely than not that the fair value of any of the Company’s reporting units is less than its carrying amount other than its IT services reporting unit, primarily due to a decline in planned revenues. Accordingly, the Company performed a quantitative assessment of goodwill impairment for its IT services reporting unit. Based on such quantitative assessment, the Company concluded that no impairment is warranted for the year ended December 31, 2016 and that the fair value of its IT services reporting unit substantially exceeded its carrying value as of December 31, 2016. 10. Goodwill and intangible assets (Continued) The total amount of the Company’s goodwill deductible for tax purposes is $39,032 and $120,617 as of December 31, 2016 and 2017, respectively. The Company’s intangible assets acquired either individually or with a group of other assets or in a business combination are as follows: As of December 31, 2016 As of December 31, 2017 Gross carrying amount Accumulated amortization & Impairment Net Gross carrying amount Accumulated amortization & Impairment Net Customer-related intangible assets $ 312,041 $ 260,018 $ 52,023 $ 369,173 $ 293,029 $ 76,144 Marketing-related intangible assets 45,098 30,571 14,527 52,443 39,212 13,231 Technology-related intangible assets 26,116 21,026 5,090 54,189 28,278 25,911 Other intangible assets 2,875 2,466 409 3,081 2,314 767 Intangible assets under development 6,897 — 6,897 15,537 — 15,537 $ 393,027 $ 314,081 $ 78,946 $ 494,423 $ 362,833 $ 131,590 Amortization expenses for intangible assets disclosed in the Consolidated Statements of Income under amortization of acquired intangible assets for the years ended December 31, 2015, 2016 and 2017 were $28,513, $27,183 and $36,412, respectively. Amortization expenses for technology-related internally developed intangible assets disclosed in the consolidated statements of income under cost of revenue and selling, general and administrative expense for the years ended December 31, 2015, 2016 and 2017 were $0, $0 and $467, respectively. During the year ended December 31, 2017, the Company tested a customer-related intangible asset for recoverability as a result of the termination of a client contract. Based on the results of such testing, the Company recorded a $1,311 write-down to reduce the amount of the asset’s total carrying value. The Company used the income approach to determine the fair value of the intangible asset for the purpose of calculating the resulting charge. This write-down has been recorded in other operating (income) expenses, net in the consolidated statement of income. During the year ended December 31, 2017, the Company also recorded a write-down to a technology-related intangible asset as described in note 9. During the year ended December 31, 2016, the Company tested an intangible software asset for recoverability as a result of a downward revision to the forecasted cash flows to be generated by the intangible asset. The Company previously recorded a charge to this asset in the third quarter of 2015. Based on the results of its testing, the Company determined that the carrying value of the intangible asset exceeded its estimated undiscounted cash flows by $10,324 and recorded an additional write-down to further reduce the carrying value by this amount. The Company used the income approach to determine the fair value of the intangible asset for the purpose of calculating the charge. This write-down had been recorded in other operating (income) expenses, net in the consolidated statement of income. During the year ended December 31, 2016, the Company also tested a customer-related intangible asset for recoverability as a result of the termination of a client contract. Based on results of such testing, the Company recorded an $871 write-down in the amount of the asset’s total carrying value. The Company used the income approach to determine the fair value of the intangible asset for the purpose of calculating the resulting charge. This write-down had been recorded in other operating (income) expenses, net in the consolidated statement of income. 10. Goodwill and intangible assets (Continued) The estimated amortization schedule for the Company’s intangible assets for future periods is set out below: For the year ending December 31: 2018 $ 38,569 2019 27,518 2020 26,831 2021 13,080 2022 and beyond 25,592 $ 131,590

Other assets

Other assets	12 Months Ended
	Dec. 31, 2017
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]
Other assets	11. Other assets Other assets consist of the following: As of December 31, 2016 2017 Customer acquisition cost $ 30,996 $ 37,017 Advance income and non-income taxes 60,203 63,474 Deferred transition costs 74,462 77,255 Deposits 29,853 32,174 Derivative instruments 20,657 24,906 Prepaid expenses 3,179 2,849 Accounts receivable due after one year 3,272 1,624 Others 19,706 22,870 $ 242,328 $ 262,169

Leases

Leases	12 Months Ended
	Dec. 31, 2017
Leases [Abstract]
Leases	12. Leases The Company has leased vehicles, furniture and fixtures, computer equipment and servers, and plants, machinery and equipment from various lessors under capital lease arrangements which are not material to the consolidated financial statements. The Company conducts its operations using facilities under non-cancellable operating lease agreements that expire at various dates. Future minimum lease payments under these agreements are as follows: As of December 31: 2018 $ 59,269 2019 54,844 2020 47,788 2021 43,692 2022 38,275 2023 and beyond 122,150 Total minimum lease payments $ 366,018 Rental expenses in agreements with rent holidays and scheduled rent increases are recorded on a straight-line basis over the applicable lease term. Rent expenses under cancellable and non-cancellable operating leases were $50,342, $50,827 and $59,484 for the years ended December 31, 2015, 2016 and 2017, respectively. The rental expenses set out above include the effect of the reclassification of foreign exchange (gains) losses related to the effective portion of foreign currency derivative contracts amounting to $2,037, $598 and $(1,533) for the years ended December 31, 2015, 2016 and 2017, respectively.

Accrued expenses and other curr

Accrued expenses and other current liabilities	12 Months Ended
	Dec. 31, 2017
Payables And Accruals [Abstract]
Accrued expenses and other current liabilities	13. Accrued expenses and other current liabilities Accrued expenses and other current liabilities consist of the following: As of December 31, 2016 2017 Accrued expenses $ 163,400 $ 204,997 Accrued employee cost 179,360 204,506 Deferred transition revenue 50,552 52,233 Statutory liabilities 36,878 36,283 Retirement benefits 17,616 21,074 Derivative instruments 4,777 10,346 Advance from customers 21,969 25,476 Earn-out consideration 6,885 14,928 Other liabilities 15,461 13,093 Capital lease obligations 1,349 1,546 $ 498,247 $ 584,482

Long-term debt

Long-term debt	12 Months Ended
	Dec. 31, 2017
Debt Disclosure [Abstract]
Long-term debt	14. Long-term debt In June 2015, the Company refinanced its 2012 facility through a new credit facility comprised of an $800,000 term loan and a $350,000 revolving credit facility. Borrowings under the new facility bear interest at a rate equal to, at the election of the Company, either LIBOR plus a margin of 1.50% per annum or a base rate plus a margin of 0.50% per annum, in each case subject to adjustment based on the Company’s debt ratings provided by Standard & Poor’s Rating Services and Moody’s Investors Service, Inc. Based on the Company’s election and current credit rating, the applicable interest rate is equal to LIBOR plus 1.50% per annum. As a result of the June 2015 refinancing, the gross outstanding term loan under the previous facility, which amounted to $663,188 as of June 30, 2015, was extinguished, and the Company expensed $10,050, representing accelerated amortization of the existing unamortized debt issuance costs related to the prior facility. Additionally, the refinancing of the revolving facility resulted in the accelerated amortization of $65 relating to the existing unamortized debt issuance cost. The remaining unamortized costs for the revolving facility, together with the fees paid to the Company’s lenders and third parties in connection with the new term loan and revolving facility, will be amortized over the term of the refinanced facility, which ends on June 30, 2020. For the year ended 2017, the Company was in compliance with the financial covenants. As of December 31, 2016 and December 31, 2017, the amount outstanding under the Company’s term loan, net of debt amortization expense of $2,667 and $1,848, was $737,333 and $698,152, respectively. As of December 31, 2016 and December 31, 2017, the term loan bore interest at a rate equal to LIBOR plus a margin of 1.50% per annum based on the Company’s election and then current credit rating. Indebtedness under the refinanced facility is unsecured. The amount outstanding on the term loan as of December 31, 2017 will be repaid through quarterly payments of $10,000, and the balance will be repaid upon the maturity of the term loan on June 30, 2020. The maturity profile of the term loan, net of debt amortization expense, is as follows: Year ended Amount 2018 $ 39,226 2019 39,272 2020 619,654 Total $ 698,152 14. Long-term debt (Continued) In March 2017, the Company issued $350,000 aggregate principal amount of 3.70% senior notes in a private offering, resulting in cash proceeds of approximately $348,519, net of an underwriting fee of $1,481. In connection with the offering, the Company incurred other debt issuance costs of $1,161. The total debt issuance cost of $2,642 is being amortized over the life of the notes as additional interest expense. As of December 31, 2017, the amount outstanding under the notes, net of debt amortization expense of $2,239, was $347,761, which is payable on April 1, 2022. The Company will pay interest on the notes semi-annually in arrears on April 1 and October 1 of each year, ending on the maturity date of April 1, 2022. The Company, at its option, may redeem the notes at any time in whole or in part, at a redemption price equal to (i) 100% of the principal amount of the notes redeemed, together with accrued and unpaid interest on the redeemed amount, and (ii) if the notes are redeemed prior to March 1, 2022, a specified “make-whole” premium. The notes are subject to certain customary covenants, including limitations on the ability of the Company and certain of its subsidiaries to incur debt secured by liens, engage in certain sale and leaseback transactions and consolidate, merge, convey or transfer their assets. Upon certain change of control transactions, the Company will be required to make an offer to repurchase the notes at a price equal to 101% of the aggregate principal amount of such notes, plus accrued and unpaid interest. The interest rate payable on the notes is subject to adjustment if the credit rating of the notes is downgraded up to a maximum increase of 2.0%. The Company is required to offer to exchange the notes for registered notes or have one or more shelf registration statements declared effective within 455 days after the issue date of the notes and, if such exchange offer fails to be consummated or such registration statement fails to be effective by June 25, 2018, then the interest payable on the notes will increase by 0.25% per annum during the 90-day period immediately following such date and will further increase by 0.25% per annum at the end of each subsequent 90-day period up to a maximum increase of 0.50%.

Short-term borrowings

Short-term borrowings	12 Months Ended
	Dec. 31, 2017
Debt Disclosure [Abstract]
Short-term borrowings	15. Short-term borrowings The Company has the following borrowing facilities: (a) Fund-based and non-fund-based credit facilities with banks, which are available for operational requirements in the form of overdrafts, letters of credit, guarantees and short-term loans. As of December 31, 2016 and December 31, 2017, the limits available were $15,382 and $15,064, respectively, of which $10,980 and $7,900 was utilized, constituting non-funded drawdown. (b) A fund-based and non-fund based revolving credit facility of $350,000, which the Company obtained in June 2015 as described in note 14. This facility replaces the Company’s $250,000 facility initially entered into in August 2012 and subsequently amended in June 2013. As of December 31, 2016 and December 31, 2017, a total of $160,978 and $170,978 respectively, was utilized, of which $160,000 and $170,000, respectively, constituted funded drawdown and $978 and $978, respectively, constituted non-funded drawdown. The revolving facility expires in June 2020. The funded drawdown amount bore interest at a rate equal to LIBOR plus a margin of 1.50% as of December 31, 2016. As of December 31, 2017, the revolving facility bore interest at a rate equal to LIBOR plus a margin of 1.50% per annum. The unutilized amount on the revolving facility bore a commitment fee of 0.25% and 0.25% as of December 31, 2016 and December 31, 2017, respectively. The credit agreement contains certain customary covenants, including a maximum leverage covenant and a minimum interest coverage ratio. During the year ended December 31, 2017, the Company was in compliance with the financial covenants.

Other liabilities

Other liabilities	12 Months Ended
	Dec. 31, 2017
Other Liabilities Disclosure [Abstract]
Other liabilities	16. Other liabilities Other liabilities consist of the following: As of December 31, 2016 2017 Accrued employee cost $ 3,976 $ 14,020 Deferred transition revenue 72,560 70,900 Retirement benefits 39,020 40,520 Derivative instruments 12,576 7,842 Amount received from GE under indemnification arrangement, pending adjustment 3,159 3,359 Advance from customers 2,371 790 Earn-out consideration 15,550 9,804 Others 11,078 18,710 Capital lease obligations 2,500 2,664 $ 162,790 $ 168,609

Employee benefit plans

Employee benefit plans	12 Months Ended
	Dec. 31, 2017
Compensation And Retirement Disclosure [Abstract]
Employee benefit plans	17. Employee benefit plans The Company has employee benefit plans in the form of certain statutory and other schemes covering its employees. Defined benefit plans In accordance with Indian law, the Company provides a defined benefit retirement plan (the “Gratuity Plan”) covering substantially all of its Indian employees. The Gratuity Plan provides a lump-sum payment to vested employees upon retirement or termination of employment in an amount based on each employee’s salary and duration of employment with the Company. The Gratuity Plan benefit cost for the year is calculated on an actuarial basis. The Company contributes the required funding for all ascertained liabilities to the Gratuity Plan. Trustees administer contributions made to the trust, and contributions are invested in specific designated instruments as permitted by Indian law. The Company’s overall investment strategy is to invest predominantly in fixed income funds managed by asset management companies. These funds further invest in debt securities such as money market instruments, government securities and public and private bonds. During the years ended December 31, 2015, 2016 and 2017, all of the plan assets were primarily invested in debt securities. In addition, in accordance with Mexican law, the Company provides certain termination benefits (the “Mexican Plan”) to all of its Mexican employees based on the age, duration of service and salary of each eligible employee. The full-year benefit cost of the Mexican Plan is calculated on an actuarial basis. In addition, certain of the Company’s subsidiaries organized or operating in the Philippines and Japan have sponsored defined benefit retirement programs (respectively, the “Philippines Plan” and the “Japan Plan”). The full-year benefit costs of the Japan Plan and the Philippines Plan are calculated on an actuarial basis. Company contributions in respect of these plans are made to insurer-managed funds or to a trust. The trust contributions are further invested in government bonds. In addition, in accordance with Israeli law, the Company provides certain termination benefits (the “Israeli Plan”) to all of its Israeli employees based on the age, duration of service and salary of each eligible employee. The full-year benefit cost of the Israeli Plan is calculated on an actuarial basis. Current service costs for defined benefit plans are accrued in the year to which they relate on a monthly basis. Actuarial gains or losses, or prior service costs, if any, resulting from amendments to the plans are recognized and amortized over the remaining period of service of the employees or over the average remaining life expectancies for inactive employees if most of the plan obligations are payable to inactive employees. 17. Employee benefit plans (Continued) The following table sets forth the funded status of the Company’s defined benefit plans and the amounts recognized in the Company’s financial statements based on actuarial valuations carried out as of December 31, 2016 and 2017. As of December 31, 2016 2017 Change in benefit obligation Projected benefit obligation at the beginning of the year $ 35,617 $ 45,283 Service cost 5,661 7,735 Actuarial loss 6,749 4,493 Interest cost 2,585 3,252 Liabilities assumed on acquisition 693 Benefits paid (4,967 ) (5,367 ) Special termination benefit - 57 Effect of exchange rate changes (1,055 ) 2,641 Projected benefit obligation at the end of the year $ 45,283 $ 58,094 Change in fair value of plan assets Fair value of plan assets at the beginning of the year $ 28,549 $ 30,871 Employer contributions 5,776 15,176 Actual gain on plan assets 1,777 2,746 Assets assumed on acquisition 170 0 Actuarial gain — 11 Benefits paid (4,897 ) (5,301 ) Effect of exchange rate changes (504 ) 2,057 Fair value of plan assets at the end of the year $ 30,871 $ 45,560 Amounts included in other comprehensive income (loss) as of December 31, 2016 and 2017 were as follows: As of December 31, 2016 2017 Net actuarial loss (8,979 ) (12,228 ) Deferred tax assets 2,759 2,221 Other comprehensive income, net (6,220 ) (10,007 ) Changes in other comprehensive income (loss) during the year ended December 31, 2017 were as follows: 2017 Net actuarial loss $ (4,182 ) Amortization of net actuarial loss 1,177 Deferred income taxes (670 ) One-time cost 211 Effect of exchange rate changes (323 ) Other comprehensive income (loss), net $ (3,787 ) 17. Employee benefit plans (Continued) Net defined benefit plan costs for the years ended December 31, 2015, 2016 and 2017 include the following components: Year ended December 31, 2015 2016 2017 Service costs $ 5,578 $ 5,661 $ 7,735 Interest costs 2,629 2,585 3,252 Amortization of actuarial loss 330 (113 ) 1,177 Expected return on plan assets (2,154 ) (2,043 ) (2,412 ) One-time cost — — 209 Special termination benefits — — 426 Net defined benefit plan costs $ 6,383 $ 6,090 $ 10,387 The amount in other comprehensive loss that is expected to be recognized as a component of net periodic benefit cost over the next fiscal year is $1,353. The weighted average assumptions used to determine the benefit obligations of the Gratuity Plan as of December 31, 2016 and 2017 are presented below: As of December 31, 2016 2017 Discount rate 7.10% - 7.5% 7.40% - 7.60% Rate of increase in compensation per annum 5.20%-11.00% 5.20%-11.00% The weighted average assumptions used to determine the Gratuity Plan costs for the years ended December 31, 2015, 2016 and 2017 are presented below: Year ended December 31, 2015 2016 2017 Discount rate 8.50% - 8.55% 8.30% - 8.45% 7.10% - 7.5% Rate of increase in compensation per annum 5.20% - 11.00% 5.20% - 11.00% 5.20% - 11.00% Expected long-term rate of return on plan assets per annum 8.50% 7.50% 7.50% The weighted average assumptions used to determine the benefit obligations of the Mexican Plan as of December 31, 2016 and 2017 are presented below: Year ended December 31, 2016 2017 Discount rate 6.80 % 7.60 % Rate of increase in compensation per annum 5.50 % 5.50 % The weighted average assumptions used to determine the costs of the Mexican Plan for the years ended December 31, 2015, 2016 and 2017 are presented below: Year ended December 31, 2015 2016 2017 Discount rate 6.50 % 6.50 % 6.80 % Rate of increase in compensation per annum 5.50 % 5.50 % 5.50 % Expected long-term rate of return on plan assets per annum 0.00 % 0.00 % 0.00 % 17. Employee benefit plans (Continued) The weighted average assumptions used to determine the benefit obligation of the Japan Plan as of December 31, 2016 and 2017 are presented below: Year ended December 31, 2016 2017 Discount rate 0.08% - 1.30% 0.113%-0.789% Rate of increase in compensation per annum 0.00% - 3.55% 0.00% - 3.55% The weighted average assumptions used to determine the costs of the Japan Plan for the years ended December 31, 2015, 2016 and 2017 are presented below: Year ended December 31, 2015 2016 2017 Discount rate 0.20% - 1.30% 0.24% - 1.30% 0.08% - 1.30% Rate of increase in compensation per annum 0.00% - 3.55% 0.00% - 3.55% 0.00% - 3.55% Expected long-term rate of return on plan assets per annum 2.69% - 3.44% 0.00% - 3.77% 0.00% - 3.09% The expected returns on plan assets set forth above are based on the Company’s expectation of the average long-term rate of return expected to prevail over the next 15 to 20 years on the types of investments prescribed by applicable statute. The Company evaluates these assumptions based on projections of the Company’s long-term growth and prevalent industry standards. Unrecognized actuarial loss is amortized over the average remaining service period of the active employees expected to receive benefits under the plan. The fair values of the Company’s plan assets as of December 31, 2016 and 2017 by asset category are as follows: Total As of December 31, 2017 Fair Value Measurements at Reporting Date Using Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Other Unobservable Inputs Total (Level 1) (Level 2) (Level 3) Asset Category Cash $ 472 $ 472 $ — $ — Fixed income securities (Note a) 42,328 3,419 38,909 — Other securities (Note b) 2,760 2,437 323 — Total $ 45,560 $ 6,328 $ 39,232 $ — 17. Employee benefit plans (Continued) Total As of December 31, 2016 Fair Value Measurements at Reporting Date Using Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Other Unobservable Inputs Total (Level 1) (Level 2) (Level 3) Asset Category Cash $ 4,809 $ 4,809 $ — $ — Fixed income securities (Note a) 23,659 3,001 20,658 — Other securities (Note b) 2,403 2,191 212 — Total $ 30,871 $ 10,001 $ 20,870 $ — (a) Includes investments in funds that invest 100% of their assets in fixed income securities such as money market instruments, government securities and public and private bonds. (b) Includes investments in funds that invest primarily in fixed income securities and the remaining portion in equity securities. The expected benefit plan payments set forth below reflect expected future service: Year ending December 31, 2018 $ 8,469 2019 8,823 2020 9,330 2021 9,946 2022 10,118 2023 - 2027 48,107 $ 94,793 The Company’s expected benefit plan payments are based on the same assumptions that were used to measure the Company’s benefit obligations as of December 31, 2017. Defined contribution plans During the years ended December 31, 2015, 2016 and 2017, the Company contributed the following amounts to defined contribution plans in various jurisdictions: Year ended December 31, 2015 2016 2017 India $ 15,915 $ 19,074 $ 22,242 U.S. 8,148 10,379 11,147 U.K. 4,453 6,593 7,823 China 14,511 15,512 15,950 Other regions 4,690 4,684 4,059 Total $ 47,717 $ 56,242 $ 61,221

Stock-based compensation

Stock-based compensation	12 Months Ended
	Dec. 31, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock-based compensation	18. Stock-based compensation The Company has issued options under the Genpact Limited 2007 Omnibus Incentive Compensation Plan (the “2007 Omnibus Plan”) and the Genpact Limited 2017 Omnibus Incentive Compensation Plan (the “2017 Omnibus Plan”) to eligible persons, including employees, directors and certain other persons associated with the Company. 18. Stock-based compensation (Continued) Under the 2007 Omnibus Plan, shares underlying options forfeited, expired, terminated or cancelled under any of the Company’s predecessor plans were added to the number of shares otherwise available for grant under the 2007 Omnibus Plan. The 2007 Omnibus Plan was amended and restated on April 11, 2012 to increase the number of common shares authorized for issuance by 5,593,200 shares to 15,000,000 shares. During the year ended December 31, 2012, the number of common shares authorized for issuance under the 2007 Omnibus Plan was increased by 8,858,823 shares as a result of a one-time adjustment to outstanding unvested share awards in connection with a special dividend payment. A brief summary of each plan is provided below: 2007 Omnibus Plan The Company adopted the 2007 Omnibus Plan on July 13, 2007 and amended and restated it on April 11, 2012. The 2007 Omnibus Plan provided for the grant of awards intended to qualify as incentive stock options, non-qualified stock options, share appreciation rights, restricted share awards, restricted share units, performance units, cash incentive awards and other equity-based or equity-related awards. Under the 2007 Omnibus Plan, the Company was authorized to grant awards for the issuance of up to a total of 23,858,823 common shares. 2017 Omnibus Plan On May 9, 2017, the Company’s shareholders approved the adoption of the Genpact Limited 2017 Omnibus Incentive Compensation Plan (the “2017 Omnibus Plan”), pursuant to which 15,000,000 Company common shares are available for issuance. No grants may be made under the 2007 Omnibus Plan after the date of adoption of the 2017 Omnibus Plan. Grants that were outstanding under the 2007 Omnibus Plan as of the Company’s adoption of the 2017 Omnibus Plan remain subject to the terms of the 2007 Omnibus Plan. Stock-based compensation costs relating to the foregoing plans during the years ended December 31, 2015, 2016 and 2017, were $24,684, $24,686 and $35,112, respectively, and have been allocated to cost of revenue and selling, general, and administrative expenses. Income tax benefits recognized in relation to stock-based compensation charges, excluding excess tax benefits, during the years ended December 31, 2015, 2016 and 2017 were $6,125, $6,446 and $9,600, respectively. Stock options All options granted under the 2007 and 2017 Omnibus Plans are exercisable into common shares of the Company, have a contractual period of ten years and vest over four to five years unless specified otherwise in the applicable award agreement. The Company recognizes compensation cost over the vesting period of the option. 18. Stock-based compensation (Continued) Compensation cost is determined at the date of grant by estimating the fair value of an option using the Black-Scholes option-pricing model. The following table shows the significant assumptions used in connection with the determination of the fair value of options granted in 2015, 2016 and 2017: 2015 2016 2017 Dividend yield — — 0.97% Expected life (in months) 84 84 84 Risk-free rate of interest for expected life 1.99% 1.42% - 1.56% 2.25 % Volatility 34.97% 25.60% - 27.22% 24.28% Volatility was calculated based on the historical volatility of the Company’s share price during a period equivalent to the estimated term of the option. The Company estimates the expected term of an option using the “simplified method,” which is based on the average of its contractual vesting term. The risk-free interest rate that the Company uses in the option valuation model is based on U.S. Treasury bonds with a term similar to the expected term of the options. The Company did not pay any regular cash dividends in fiscal 2016. The Company paid a cash dividend of $0.06 per share in each quarter of fiscal 2017. The Company has issued, and intends to continue to issue, new common shares upon stock option exercises and the vesting of share awards under its equity-based incentive compensation plans. A summary of stock option activity during the years ended December 31, 2015, 2016 and 2017 is set out below: Year ended December 31, 2015 Shares arising out of options Weighted average exercise price Weighted average remaining contractual life (years) Aggregate intrinsic value Outstanding as of January 1, 2015 7,371,727 $ 15.44 5.9 $ — Granted 170,000 22.77 — — Forfeited (125,000 ) 19.35 — — Expired (1,277 ) 14.32 — — Exercised (1,428,605 ) 9.49 — 22,122 Outstanding as of December 31, 2015 5,986,845 $ 16.99 5.8 $ 48,661 Vested as of December 31, 2015 and expected to vest thereafter (Note a) 5,754,969 $ 16.76 5.8 $ 47,325 Vested and exercisable as of December 31, 2015 2,183,846 $ 12.67 2.7 $ 26,892 Weighted average grant-date fair value of options granted during the period $ 9.15 18. Stock-based compensation (Continued) Year ended December 31, 2016 Shares arising out of options Weighted average exercise price Weighted average remaining contractual life (years) Aggregate intrinsic value Outstanding as of January 1, 2016 5,986,845 $ 16.99 5.8 $ — Granted 860,000 26.80 — — Forfeited (145,000 ) 17.77 — — Expired — — — — Exercised (994,155 ) 14.98 — 9,301 Outstanding as of December 31, 2016 5,707,690 $ 18.65 5.8 $ 34,641 Vested as of December 31, 2016 and expected to vest thereafter (Note a) 5,457,701 $ 18.42 5.8 $ 34,150 Vested and exercisable as of December 31, 2016 2,746,191 $ 15.62 4.0 $ 23,960 Weighted average grant-date fair value of options granted during the period $ 8.50 Year ended December 31, 2017 Shares arising out of options Weighted average exercise price Weighted average remaining contractual life (years) Aggregate intrinsic value Outstanding as of January 1, 2017 5,707,690 $ 18.65 5.8 $ — Granted 250,000 24.74 — — Forfeited (80,000 ) 20.63 — — Expired — — — — Exercised (743,045 ) 14.50 — 12,636 Outstanding as of December 31, 2017 5,134,645 $ 19.52 5.6 $ 62,743 Vested as of December 31, 2017 and expected to vest thereafter (Note a) 4,988,875 $ 19.36 5.6 $ 61,779 Vested and exercisable as of December 31, 2017 2,203,146 $ 16.17 4.1 $ 34,303 Weighted average grant-date fair value of options granted during the period $ 6.62 (a) Options expected to vest reflect an estimated forfeiture rate. Cash received by the Company upon the exercise of stock options amounted to $13,564, $14,896 and $10,772. Cash tax benefits realized by the Company upon the exercise of stock options during the year ended December 31, 2015 and tax benefits from the exercise of stock options during the years ended December 31, 2016 and 2017 were $6,982, $1,548 and $2,016 (including excess tax benefits of $6,560, $1,004, $1,723), respectively. As of December 31, 2017, the total remaining unrecognized stock-based compensation cost for options expected to vest amounted to $6,479, which will be recognized over the weighted average remaining requisite vesting period of 2.9 years. Restricted Share Units The Company has granted restricted share units, or RSUs, under the 2007 and 2017 Omnibus Plans. Each RSU represents the right to receive one common share. The fair value of each RSU is the market price of one common share of the Company on the date of grant. The RSUs granted to date have graded 18. Stock-based compensation (Continued) vesting schedules of three months to four years. The compensation expense is recognized on a straight-line basis over the vesting term. A summary of RSUs granted during the years ended December 31, 2015, 2016 and 2017 is set out below: Year ended December 31, 2015 Number of Restricted Share Units Weighted Average Grant Date Fair Value Outstanding as of January 1, 2015 488,418 $ 15.36 Granted 53,546 20.88 Vested (Note b) (351,338 ) 15.29 Forfeited (33,236 ) 14.00 Outstanding as of December 31, 2015 157,390 $ 17.67 Expected to vest (Note a) 147,226 Year ended December 31, 2016 Number of Restricted Share Units Weighted Average Grant Date Fair Value Outstanding as of January 1, 2016 157,390 $ 17.67 Granted 95,553 25.49 Vested (Note c) (133,903 ) 20.66 Forfeited (1,135 ) 14.18 Outstanding as of December 31, 2016 117,905 $ 20.65 Expected to vest (Note a) 107,366 Year ended December 31, 2017 Number of Restricted Share Units Weighted Average Grant Date Fair Value Outstanding as of January 1, 2017 117,905 $ 20.65 Granted 1,533,836 26.36 Vested (Note d) (45,248 ) 18.31 Forfeited (1,242 ) 25.53 Outstanding as of December 31, 2017 1,605,251 $ 26.17 Expected to vest (Note a) 1,371,567 (a) RSUs expected to vest reflect an estimated forfeiture rate. (b) Vested RSUs were net settled by issuing 199,949 shares (net of minimum statutory tax withholding). 53,546 RSUs vested in the year ended December 31, 2015, 53,023 shares in respect of which were issued in 2017 after withholding shares to the extent of minimum statutory withholding taxes. (c) Vested RSUs were net settled by issuing 29,719 shares (net of minimum statutory tax withholding). 86,517 RSUs vested in the year ended December 31, 2016. 17,802 common shares underlying 34,035 of such RSUs were issued in 2017 after withholding shares to the extent of minimum statutory withholding taxes. Shares underlying the remaining 52,482 of such RSUs will be issued in 2018 after withholding shares to the extent of minimum statutory withholding taxes. (d) Vested RSUs were net settled by issuing 32,395 shares (net of minimum statutory tax withholding). 18. Stock-based compensation (Continued) 92,692 RSUs vested in the year ended December 31, 2014, in respect of which 91,963 shares were issued in 2016 after withholding shares to the extent of minimum statutory withholding taxes. 61,057 RSUs vested in the year ended December 31, 2013, in respect of which 59,827 shares were issued in January 2015 after withholding shares to the extent of minimum statutory withholding taxes. As of December 31, 2017, the total remaining unrecognized stock-based compensation cost related to RSUs amounted to $26,543, which will be recognized over the weighted average remaining requisite vesting period of 2.9 years. Performance Units The Company also grants stock awards in the form of performance units, or PUs, and has granted PU’s under both the 2007 and 2017 Omnibus Plans. Each PU represents the right to receive one common share at a future date based on the Company’s performance against specified targets. PUs granted to date have vesting schedules of six months to three years. The fair value of each PU is the market price of one common share of the Company on the date of grant and assumes that performance targets will be achieved. PUs granted under the plan are subject to cliff vesting. The compensation expense for such awards is recognized on a straight-line basis over the vesting terms. During the performance period, the Company’s estimate of the number of shares to be issued is adjusted upward or downward based upon the probability of achievement of the performance targets. The ultimate number of shares issued and the related compensation cost recognized is based on a comparison of the final performance metrics to the specified targets. A summary of PU activity during the years ended December 31, 2015, 2016 and 2017 is set out below: Year ended December 31, 2015 Number of Performance Units Weighted Average Grant Date Fair Value Maximum Shares Eligible to Receive Outstanding as of January 1, 2015 1,292,750 $ 16.78 2,648,626 Granted 1,375,650 22.72 2,965,475 Vested (Note b) (855 ) 16.78 (855 ) Forfeited (136,216 ) 17.82 (156,194 ) Adjustment due to achievement of lower-than-target performance (Note c) (32,007 ) 20.45 Adjustment due to achievement of lower-than-maximum performance (Note d) (2,957,730 ) Outstanding as of December 31, 2015 2,499,322 $ 19.95 2,499,322 Expected to vest (Note a) 2,184,906 18. Stock-based compensation (Continued) Year ended December 31, 2016 Number of Performance Units Weighted Average Grant Date Fair Value Maximum Shares Eligible to Receive Outstanding as of January 1, 2016 2,499,322 $ 19.95 2,499,322 Granted 1,518,374 27.93 3,343,335 Vested — — — Forfeited (252,842 ) 21.88 (325,817 ) Adjustment upon final determination of level of performance goal achievement (Note e) 7,274 22.72 Adjustment upon final determination of level of performance goal achievement (Note e) 7,274 Outstanding as of December 31, 2016 3,772,128 $ 23.04 5,524,114 Expected to vest (Note a) 2,226,489 Year ended December 31, 2017 Number of Performance Units Weighted Average Grant Date Fair Value Maximum Shares Eligible to Receive Outstanding as of January 1, 2017 3,772,128 $ 23.04 5,524,114 Granted 1,811,292 25.22 3,622,584 Vested (Note f) (1,136,047) 16.78 (1,136,047) Forfeited (Note g) (1,583,913 ) 27.57 (1,627,313 ) Adjustment upon final determination of level of performance goal achievement (Note h) 37,480 25.22 Adjustment upon final determination of level of performance goal achievement (Note i) (3,482,398) Outstanding as of December 31, 2017 2,900,940 $ 24.40 2,900,940 Expected to vest (Note a) 2,657,685 (a) PUs expected to vest are based on the probable achievement of the performance targets after considering an estimated forfeiture rate. (b) Vested PUs were net settled upon vesting by issuing 590 shares (net of minimum statutory tax withholding). 18. Stock-based compensation (Continued) (c) Represents a 5.2% to 6.7% reduction, depending on the targets under the PU award granted, in the number of target shares as a result of achievement of lower-than-target performance for the PUs granted in 2015, partially offset by a 0.8% to 6.6% increase in the number of target shares as a result of achievement of higher-than-target performance for the PUs granted in 2014. (d) Represents the difference between the maximum number of shares achievable and the number of shares expected to vest under the PU awards granted in 2015. Also includes the difference between the maximum number of shares achievable and the number of shares eligible to vest under the PU awards granted in 2014 based on the certified level of achievement of the performance goals. (e) Represents an adjustment made in March 2016 to the number of shares underlying the PUs granted in 2015 upon certification of the level of achievement of the performance targets for such awards. (f) Vested PUs were net settled upon vesting by issuing 731,701 shares (net of minimum statutory tax withholding). (g) Includes 1,443,624 target shares underlying PUs granted in 2016 which were forfeited for failure to achieve all of the threshold performance targets under such awards as certified by the compensation committee based on the Company’s audited financial statements for the year ended December 31, 2016. (h) Represents a 2.7% increase in the number of target shares as a result of achievement of higher-than-target performance for certain PUs granted in 2017, partially offset by a 12.5% reduction as a result of achievement of lower-than-target performance for certain PUs granted in 2017. (i) Represents the difference between the maximum number of shares achievable and the number of shares expected to vest under the PU awards granted in 2017 based on the level of achievement of the performance goals. Also includes the difference between the maximum number of shares achievable and the number of shares eligible to vest under the PU awards granted in 2016, which were forfeited for failure to achieve all of the threshold performance targets under such awards as certified by the compensation committee based on the Company’s audited financial statements for the year ended December 31, 2016. 1,329,270 shares vested in the year ended December 31, 2014 in respect of PUs granted in March 2012. 845,524 shares (net of minimum statutory tax withholding) in respect of such PUs were issued in January 2015. As of December 31, 2017, the total remaining unrecognized stock-based compensation cost related to PUs amounted to $28,992, which will be recognized over the weighted average remaining requisite vesting period of 2.0 years. Employee Stock Purchase Plan (ESPP) On May 1, 2008, the Company adopted the Genpact Limited U.S. Employee Stock Purchase Plan and the Genpact Limited International Employee Stock Purchase Plan (together, the “ESPP”). The ESPP allows eligible employees to purchase the Company’s common shares through payroll deductions at 90% of the closing price of the Company’s common shares on the last business day of each purchase interval. The dollar amount of common shares purchased under the ESPP must not exceed 15% of the participating employee’s base salary, subject to a cap of $25 per employee per calendar year. With effect from September 1, 2009, the offering periods commence on the first business day in March, June, September and December of each year and end on the last business day of the subsequent May, August, November and February. 4,200,000 common shares have been reserved for issuance in the aggregate over the term of the ESPP. 18. Stock-based compensation (Continued) During the years ended December 31, 2015, 2016 and 2017, 121,485, 146,685 and 190,435 common shares, respectively, were issued under the ESPP. The ESPP is considered compensatory under FASB guidance on Compensation-Stock Compensation. The compensation expense for the ESPP is recognized in accordance with the FASB guidance on Compensation—Stock Compensation. The compensation expense for the ESPP during the years ended December 31, 2015, 2016 and 2017 was $292, $428 and $573, respectively, and has been allocated to cost of revenue and selling, general, and administrative expenses.

Capital stock

Capital stock	12 Months Ended
	Dec. 31, 2017
Equity [Abstract]
Capital stock	19. Capital stock The Company’s authorized capital stock as of December 31, 2016 and 2017 consisted of 500 million common shares with a par value of $0.01 per share, and 250 million preferred shares with a par value of $0.01 per share. There were 198,794,052 and 192,825,207 common shares, and no preferred shares, issued and outstanding as of December 31, 2016 and 2017, respectively. Holders of common shares are entitled to one vote per share. Upon the liquidation, dissolution or winding up of the Company, common shareholders are entitled to receive a ratable share of the available net assets of the Company after payment of all debts and other liabilities. The common shares have no preemptive, subscription, redemption or conversion rights. The Company’s board of directors by resolution can establish one or more series of preferred shares having such par value, designations, dividend rates, relative voting rights, conversion or exchange rights, redemption rights, liquidation rights and other relative participation, optional or other rights, qualifications, limitations or restrictions as may be fixed by the board of directors without shareholder approval. Such rights, preferences, powers and limitations as may be established could also have the effect of discouraging an attempt to obtain control of the Company. These preferred shares are of the type commonly known as “blank-check” preferred shares. Under Bermuda law, the Company may declare and pay dividends from time to time unless there are reasonable grounds for believing that the Company is or would, after the payment, be unable to pay its liabilities as they become due or that the realizable value of its assets would thereby be less than the aggregate of its liabilities, its issued share capital, and its share premium accounts. Under the Company’s bye-laws, each common share is entitled to dividends if, as and when dividends are declared by the Company’s board of directors. There are no restrictions in Bermuda on the Company’s ability to transfer funds (other than funds denominated in Bermuda dollars) in or out of Bermuda or to pay dividends to U.S. residents who are holders of common shares. The Company’s ability to declare and pay cash dividends is restricted by its debt covenants. 19. Capital stock (Continued) Share Repurchases As of December 31, 2016, the Company’s board of directors (the “Board”) had authorized the Company to repurchase up to $750,000 in value of the Company’s common shares under its share repurchase program first announced in February 2015. On February 10, 2017 the Board approved up to an additional $500,000 in share repurchases, bringing the total authorization under the Company’s existing program to $1,250,000. The Company’s share repurchase program does not obligate it to acquire any specific number of shares. Under the program, shares may be purchased in privately negotiated and/or open market transactions, including under plans complying with Rule 10b5-1 under the Securities Exchange Act of 1934, as amended. On March 29, 2017, the Company entered into an accelerated share repurchase (“ASR”) agreement with Morgan Stanley & Co. LLC (the “Dealer”) to repurchase Company common shares for an aggregate purchase price of $200,000. Pursuant to the ASR agreement, as amended in November 2017, the Company paid the aggregate purchase price to the Dealer upfront and received an initial delivery of 6,578,947 common shares on March 30, 2017 and an additional delivery of 350,006 common shares on December 29, 2017. The total value of the 6,928,953 common shares delivered to the Company through December 29, 2017 was $196,000, and the weighted average price per share of the common shares delivered was $28.29. The Company’s purchase of its common shares under the ASR has been recorded as a reduction in retained earnings. The value of the common shares to be purchased under the ASR but not yet delivered to the Company as of December 31, 2017, amounting to $4,000, was recorded in additional paid-in-capital. All repurchased shares have been retired. The final settlement of the shares repurchased under the ASR was completed in January 2018. The final number of common shares repurchased by the Company under the ASR agreement was based on the volume-weighted average share price of the Company’s common shares during the term of the transaction, less a discount and subject to adjustments pursuant to the terms of the ASR agreement. The ASR agreement contains customary provisions, including, among other things, with respect to mechanisms to determine the number of shares or the amount of cash that will be delivered at settlement, the required timing of delivery upon settlement, specific circumstances under which adjustments may be made to the repurchase transaction, and specific circumstances under which the repurchase transaction may be canceled prior to the scheduled maturity. During the years ended December 31, 2017 and December 31, 2016, the Company also purchased 808,293 and 13,940,782 The Company records repurchases of its common shares on the settlement date of each transaction. Shares purchased and retired are deducted to the extent of their par value from common stock and from retained earnings for the excess over par value. Direct costs incurred to acquire the shares are included in the total cost of the shares purchased. For the year ended December 31, 2015, December 31, 2016 and December 31, 2017, $197, $279 and $16, respectively, was deducted from retained earnings in direct costs related to share repurchases. Dividend In February 2017, the Company’s board of directors approved a dividend program under which the Company paid a regular quarterly cash dividend of $0.06 per share to holders of its common shares, representing an annual dividend of $0.24 per share in 2017. On March 28, 2017, June 28, 2017, September 21, 2017, and December

Earnings per share

Earnings per share	12 Months Ended
	Dec. 31, 2017
Earnings Per Share [Abstract]
Earnings per share	20. Earnings per share The Company calculates earnings per share in accordance with FASB guidance on Earnings per Share. Basic and diluted earnings per common share give effect to the change in the number of common shares outstanding. The calculation of basic earnings per common share was determined by dividing net income available to common shareholders by the weighted average number of common shares outstanding. The potentially dilutive shares, consisting of outstanding options on common shares, restricted share units, common shares to be issued under the ESPP and performance units, have been included in the computation of diluted net earnings per share and number of weighted average shares outstanding, except where the result would be anti-dilutive. The number of stock awards outstanding but not included in the computation of diluted earnings per common share because their effect was anti-dilutive is 2,821,000, 781,215 and 1,007,480 for the years ended December 31, 2015, 2016 and 2017, respectively. Year ended December 31, 2015 2016 2017 Net income available to Genpact Limited common shareholders $ 239,817 $ 269,684 $ 263,111 Weighted average number of common shares used in computing basic earnings per common share 216,606,542 206,861,536 193,864,755 Dilutive effect of stock-based awards 2,538,502 3,264,487 3,184,797 Weighted average number of common shares used in computing dilutive earnings per common share 219,145,044 210,126,023 197,049,552 Earnings per common share attributable to Genpact Limited common shareholders Basic $ 1.11 $ 1.30 $ 1.36 Diluted $ 1.09 $ 1.28 $ 1.34

Cost of revenue

Cost of revenue	12 Months Ended
	Dec. 31, 2017
Other Income And Expenses [Abstract]
Cost of revenue	21. Cost of revenue Cost of revenue consists of the following: Year ended December 31, 2015 2016 2017 Personnel expenses $ 1,013,209 $ 1,061,501 $ 1,155,745 Operational expenses 432,535 446,922 481,012 Depreciation and amortization 47,803 46,284 46,947 $ 1,493,547 $ 1,554,707 $ 1,683,704

Selling, general and administra

Selling, general and administrative expenses	12 Months Ended
	Dec. 31, 2017
Selling General And Administrative Expenses [Abstract]
Selling, general and administrative expenses	22. Selling, general and administrative expenses Selling, general and administrative expenses consist of the following: Year ended December 31, 2015 2016 2017 Personnel expenses $ 430,088 $ 469,956 $ 501,445 Operational expenses 169,042 174,060 178,573 Depreciation and amortization 8,984 9,013 9,829 $ 608,114 $ 653,029 $ 689,847

Other operating (income) expens

Other operating (income) expense, net	12 Months Ended
	Dec. 31, 2017
Other Income And Expenses [Abstract]
Other operating (income) expense, net	23. Other operating (income) expense, net Year ended December 31, 2015 2016 2017 Other operating (income) expense $ (2,515 ) $ (1,266 ) $ (7,277 ) Provision for impairment of intangible assets and property, plant and equipment 10,714 11,195 9,311 Change in fair value of earn-out consideration and deferred consideration (relating to business acquisitions) (11,521 ) (14,869 ) (3,695 ) Other operating (income) expense, net $ (3,322 ) $ (4,940 ) $ (1,661 )

Interest income (expense), net

Interest income (expense), net	12 Months Ended
	Dec. 31, 2017
Banking And Thrift Interest [Abstract]
Interest income (expense), net	24. Interest income (expense), net Interest income (expense), net consists of the following: Year ended December 31, 2015 2016 2017 Interest income $ 8,676 $ 7,247 $ 8,182 Interest expense (29,828 ) (23,431 ) (39,917 ) Loss on extinguishment of debt (10,115 ) - - Interest income (expense), net $ (31,267 ) $ (16,184 ) $ (31,735 )

Income taxes

Income taxes	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income taxes	25. Income taxes Income tax expense (benefit) for the years ended December 31, 2015, 2016 and 2017 is allocated as follows: Year ended December 31, 2015 2016 2017 Income from continuing operations $ 61,937 $ 62,098 $ 59,742 Other comprehensive Income: Unrealized gains (losses) on cash flow hedges 13,816 23,809 457 Retirement benefits 1,304 (1,885 ) 670 Additional paid in capital: Excess tax benefit on stock-based compensation (6,560 ) — — Retained earnings: Deferred tax assets recognized on early adoption of ASU 2016-09 — (24,912 ) — The components of income before income tax expense from continuing operations are as follows: Year ended December 31, 2015 2016 2017 Domestic (U.S.) $ 23,122 $ 44,110 $ 8,440 Foreign (Non-U.S.) 278,632 285,535 312,143 Income before income taxes $ 301,754 $ 329,645 $ 320,583 25. Income taxes (Continued) Income tax expense (benefit) attributable to income from continuing operations consists of: Year ended December 31, 2015 2016 2017 Current taxes: Domestic (U.S. federal taxes) $ 12,142 $ 78 $ 3,380 Domestic (U.S. state taxes) 301 1,069 1,268 Foreign (Non-U.S.) 68,207 30,497 65,485 $ 80,650 $ 31,644 $ 70,133 Deferred taxes: Domestic (U.S. federal taxes) $ (5,396 ) $ 11,379 $ 3,549 Domestic (U.S. state taxes) 344 (459 ) (2,809 ) Foreign (Non-U.S.) (13,661 ) 19,534 (11,131 ) $ (18,713 ) $ 30,454 $ (10,391 ) Total income tax expense (benefit) $ 61,937 $ 62,098 $ 59,742 Income tax expense (benefit) attributable to income from continuing operations differed from the amounts computed by applying the U.S. federal statutory income tax rate of 35% to income before income taxes, as a result of the following: Year ended December 31, 2015 2016 2017 Income before income tax expense $ 301,754 $ 329,645 $ 320,583 Statutory tax rates 35 % 35 % 35 % Computed expected income tax expense 105,614 115,376 112,204 Increase (decrease) in income taxes resulting from: Foreign tax rate differential (16,550 ) (18,574 ) (25,224 ) Tax benefit from tax holiday (38,039 ) (32,893 ) (35,814 ) Non-deductible expenses 1,884 2,295 1,146 Effect of change in tax rates 1,436 353 2,778 Change in valuation allowance (33 ) (4,830 ) 9,041 Unrecognized tax benefits 6,272 (627 ) 1,611 Other* 1,353 998 (6,000 ) Reported income tax expense (benefit) $ 61,937 $ 62,098 $ 59,742 *During 2017, following the transfer/closure of certain affiliated entities, deferred tax liabilities recorded against the outside basis difference amounting to $9,600 were reversed. It was not more likely than not that the resulting net deferred tax asset would be realized. Therefore, a full valuation allowance was established to offset the reduction in deferred tax liabilities. A portion of the profits of the Company’s operations is exempt from income tax in India. One of the Company’s Indian subsidiaries has sixteen units eligible for a tax holiday as a special economic zone unit in respect of 100% of the export profits it generates for a period of 5 years from commencement, 50% of such profits for the next 5 years (year 6 to year 10 from commencement) and 50% of the profits for an additional period of 5 years (year 11 to year 15 from commencement), subject to the satisfaction of certain capital investment requirements. The tax holidays for the Company’s existing special economic zone units will begin to expire on March 31, 2022 and will have fully expired on March 31, 2029, assuming the Company satisfies the capital investment requirements. The effect of the Indian tax holiday on basic earnings per share was $0.18, $0.19 and $0.18, respectively, for the years ended December 31, 2015, 2016 and 2017. The effect of the tax holiday on diluted earnings per share was $0.17, $0.18 and $0.18, respectively, for the years ended December 31, 2015, 2016 and 2017. 25. Income taxes (Continued) The components of the Company’s deferred tax balances as of December 31, 2016 and 2017 are as follows: As of December 31, 2016 2017 Deferred tax assets Net operating loss carryforwards $ 52,997 $ 55,500 Accrued liabilities and other expenses 19,840 41,177 Provision for doubtful debts 6,419 10,509 Property, plant and equipment 3,445 1,270 Unrealized losses on cash flow hedges, Net 558 275 Share-based compensation 19,054 19,789 Retirement benefits 5,067 5,817 Deferred revenue 44,892 22,948 Tax credit carryforwards 34,509 35,322 Other 8,876 11,571 Gross deferred tax assets $ 195,657 $ 204,178 Less: valuation allowance (14,746 ) (24,549 ) Total deferred tax assets $ 180,911 $ 179,629 Deferred tax liabilities Intangible assets $ 13,519 $ 15,954 Property, plant and equipment 2,745 1,131 Deferred cost 41,950 33,816 Investments in foreign subsidiaries not indefinitely reinvested 29,546 18,949 Unrealized gains on cash flow hedges, net 14,350 14,711 Other 11,073 24,886 Total deferred tax liabilities $ 113,183 $ 109,447 Net deferred tax asset $ 67,728 $ 70,182 As of December 31, Classified as 2016 2017 Deferred tax assets Non-current $ 70,143 $ 76,929 Deferred tax liabilities Non-current 2,415 6,747 $ 67,728 $ 70,182 The change in the total valuation allowance for deferred tax assets as of December 31, 2015, 2016 and 2017 is as follows: Year ended December 31, 2015 2016 2017 Opening valuation allowance $ 21,094 $ 20,091 $ 14,746 Reduction during the year (3,499 ) (7,299 ) (3,957 ) Addition during the year 2,496 1,954 13,760 Closing valuation allowance $ 20,091 $ 14,746 $ 24,549 25. Income taxes (Continued) In assessing the realizability of deferred tax assets, management considers whether it is more likely than not that some or all of the deferred tax assets will not be realized. The ultimate realization of deferred tax assets depends on the generation of future taxable income during the periods in which temporary differences are deductible. Management considers the scheduled reversal of deferred tax liabilities and projected taxable income in making this assessment. In order to fully realize a deferred tax asset, the Company must generate future taxable income prior to the expiration of the deferred tax asset under applicable law. Based on the level of historical taxable income and projections for future taxable income over the periods during which the Company’s deferred tax assets are deductible, management believes that it is more likely than not that the Company will realize the benefits of these deductible differences, net of the existing valuation allowances as of December 31, 2017. The amount of the Company’s deferred tax assets considered realizable, however, could be reduced in the near term if estimates of future taxable income during the carryforward period are reduced. In 2016, one of the Company’s subsidiaries filed amended tax returns with respect to prior years, resulting in revised assessments, higher taxable income and the utilization of operating loss carryforwards. The use of operating loss carryforwards resulted in the complete reversal of the subsidiary’s remaining valuation allowance of $3,377. On January 1, 2016, the Company elected the early adoption of ASU 2016-09, which was applied using a modified retrospective approach. Accordingly, excess tax benefits relating to the exercise of stock options prior to December 31, 2015 amounting to $24,912 were recorded through retained earnings. For the year ended December 31, 2016 and 2017, the Company has recognized net excess tax benefits of $1,004 and $1,723 in income tax expense attributable to continuing operations. The Company recorded excess tax benefits of $6,560, $0, and $0 through additional paid-in capital during the years ended December 31, 2015, 2016 and 2017, respectively. As of December 31, 2017, the Company’s deferred tax assets related to net operating loss carryforwards of $223,415 amounted to $50,495 (excluding state net operating losses). Net operating losses of subsidiaries in the United Kingdom, Singapore, Malaysia, Australia, Brazil, Israel, South Africa, Hong Kong and Luxembourg amounted to $126,612 and can be carried forward for an indefinite period. 25. Income taxes (Continued) The Company’s remaining tax loss carryforwards expire as set forth in the table below: US – Federal Europe Others Year ending December 31, 2018 $ — $ — $ 20 2019 — — 72 2020 — 1,872 62 2021 — 581 2,084 2022 — 5,253 60 2023 — 8,500 953 2024 — 1,213 7,941 2025 — 28,222 9,647 2026 9,511 2,263 3,072 2027 9,913 — 2,053 2028 — 33 2,451 2034 — — 1,027 $ 19,424 $ 47,937 $ 29,442 In the table above, “Europe” includes net operating losses of subsidiaries in Hungary, Poland, the Netherlands, the Czech Republic, Slovakia, and Portugal, while “Others” includes net operating losses of subsidiaries in Mexico, Japan, China, India and Canada. As of December 31, 2017, the Company had additional deferred tax assets for U.S. state and local tax loss carryforwards amounting to $5,005 with varying expiration periods between 2018 and 2036. As of December 31, 2017, the company had a total foreign tax credit carryforward of $33,220, which will expire as set forth in the table below: Year ending December 31, Amount 2023 $ 893 2024 1,202 2025 15,552 2026 8,481 2027 5,362 2028 1,730 $ 33,220 Undistributed earnings of the Company’s foreign (non-Bermuda) subsidiaries which cannot be repatriated in a tax-free manner and for which a deferred tax liability has not been recognized amounted to $36,029 as of December 31, 2017. The Company has not accrued any income, distribution or withholding taxes that would arise if such earnings were repatriated. Due to the Company’s changing corporate structure, the various methods that are available to repatriate earnings, and uncertainty relative to the applicable taxes at the time of repatriation, it is not practicable to determine the amount of tax that would be imposed upon repatriation. If undistributed earnings are repatriated in the future, or are no longer deemed to be indefinitely reinvested, the company will accrue the applicable amount of taxes associated with such earnings at that time. 25. Income taxes (Continued) As of December 31, 2017, $499,532 of the Company’s $504,468, in cash and cash equivalents was held by the Company’s foreign (non-Bermuda) subsidiaries. $243,813 of this cash is held by foreign subsidiaries for which the Company expects to incur and has accrued a deferred tax liability on the repatriation of $17,343 of retained earnings. $122,674 of the Company’s cash and cash equivalents is held by foreign subsidiaries in jurisdictions where no tax is expected to be imposed upon repatriation. The remaining $133,045 in cash and cash equivalents held by certain foreign subsidiaries of the Company is being indefinitely reinvested. On December 22, 2017, the U.S. government enacted comprehensive tax legislation commonly referred to as the Tax Cut and Jobs Act (the “Tax Act”). The Tax Act makes broad and complex changes to the U.S. tax code that affect 2017. The Tax Act also establishes new tax laws that will affect 2018 and subsequent years, including a reduction in the U.S. federal corporate income tax rate from 35% to 21%. On December 22, 2017, the SEC staff issued Staff Accounting Bulletin No. 118 (“SAB 118”), which provides guidance on accounting for the tax effects of the Tax Act. SAB 118 provides a measurement period that should not extend beyond one year from the Tax Act enactment date for companies to complete the accounting under ASC 740, Income Taxes. In accordance with SAB 118, a company must reflect the income tax effects of those aspects of the Tax Act for which the accounting under ASC 740 is complete. To the extent that a company’s accounting for certain income tax effects of the Tax Act is incomplete but it is able to determine a reasonable estimate, it must record a provisional estimate in the financial statements. As a result of the reduction in the federal corporate income tax rate, the Company has revalued its net deferred tax assets, excluding tax credits to the extent affected by changes in the law as of December 31, 2017. Based on this revaluation, the Company has recorded a net tax expense of $3,182 to reduce its net deferred tax asset balance, which was recorded as additional income tax expense for the year ended December 31, 2017. Additionally, the Company has claimed 100% depreciation on $7,685 of the investments it made in depreciable property after September 27, 2017. The estimation of transition tax on mandatory repatriation introduced under the Tax Act is provisional, which is currently estimated based on information available as of December 31, 2017. The Company has not recorded any tax liability for transition tax as of December 31, 2017 pending detailed workings for the earnings and profit pool of its controlled foreign corporations. The Company will recognize any changes to the provisional amounts as it refines its estimates and interpretations of the application of the Tax Act. The Company expects to complete its analysis of the provisional items during the second half of 2018. The effects of other provisions of the Tax Act are not expected to have a material impact on the Company’s consolidated financial statements for the year ended December 31, 2017. 25. Income taxes (Continued) The following table summarizes activities related to our unrecognized tax benefits from January 1 to December 31 for each of 2015, 2016 and 2017: Year Ended December 31, 2015 2016 2017 Opening balance at January 1 $ 22,718 $ 26,357 $ 23,467 Increase related to prior year tax positions, including recorded in acquisition accounting 2,000 370 2,582 Decrease related to prior year tax positions — (1,506 ) (1,398 ) Decrease related to divestiture of business — (345 ) — Decrease related to prior year tax position due to lapse of applicable statute of limitation (820 ) (2,122 ) (1,019 ) Increase related to current year tax positions, including recorded in acquisition accounting 3,544 3,225 1,661 Decrease related to settlements with tax Authorities — (2,000 ) — Effect of exchange rate changes (1,085 ) (512 ) 767 Closing balance at December 31 $ 26,357 $ 23,467 $ 26,060 As of December 31, 2015, 2016 and 2017, the Company had unrecognized tax benefits amounting to $24,935, $22,469 and $24,877, respectively, which, if recognized, would impact the effective tax rate. As of December 31, 2015, 2016 and 2017, the Company had accrued $4,223, $3,856 and $4,614, respectively, in interest relating to unrecognized tax benefits. During the years ended December 31, 2015, 2016 and 2017, the Company recognized $1,152, $(206) and $(224), respectively, excluding exchange rate differences, in interest on unrecognized tax benefits. As of December 31, 2015, 2016 and 2017, the company had accrued $958, $977 and $1,033, respectively, for penalties. In the next twelve months and for all tax years that remain open to examinations by U.S. federal and various state, local, and non-U.S. tax authorities, the Company estimates that it is reasonably possible that the total amount of its unrecognized tax benefits will vary. However, the Company does not expect significant changes within the next twelve months other than depending on the progress of tax matters or examinations with various tax authorities, which are difficult to predict. With exceptions, the Company is no longer subject to U.S. federal, state and local or non-U.S. income tax audits by taxing authorities for years prior to 2013. The Company’s subsidiaries in India and China are open to examination by relevant taxing authorities for tax years beginning on or after April 1, 2009, and January 1, 2007, respectively. The Company regularly reviews the likelihood of additional tax assessments and adjusts its reserves as additional information or events require.

Segment reporting

Segment reporting	12 Months Ended
	Dec. 31, 2017
Segment Reporting [Abstract]
Segment reporting	26. Segment reporting The Company manages various types of business process and information technology services in an integrated manner for clients in various industries and geographic locations. The Company’s Chief Executive Officer, who has been identified as the Chief Operation Decision Maker (CODM), reviews financial information prepared on a consolidated basis, accompanied by disaggregated information about revenue and adjusted operating income by identified business units. The identified business units are organized for operational reasons and represent either services-based, customer-based, industry-based or geography-based units. There is significant overlap between the manner in which the business units are organized. Additionally, the composition and organization of the business units is fluid and the structure changes regularly in response to growth of the overall business, acquisitions and changes in the reporting structure, clients, services, industries served, and delivery centers. Based on an overall evaluation of all facts and circumstances, and after combining operating segments with similar economic characteristics that comply with other aggregation criteria specified in the FASB guidance on segment reporting, the Company has determined that it operates as a single reportable segment. Net revenues by service type are as follows: Year ended December 31, 2015 2016 2017 Business process outsourcing $ 1,933,095 $ 2,083,450 $ 2,264,335 Information technology services 527,949 487,306 472,594 Total net revenues $ 2,461,044 $ 2,570,756 $ 2,736,929 Revenues from clients based on the industry serviced are as follows: Year ended December 31, 2015 2016 2017 Banking, financial services and insurance $ 1,030,584 $ 1,055,704 $ 1,105,731 Manufacturing, including pharmaceuticals and medical equipment manufacturing 878,570 958,779 1,002,973 Technology, healthcare and other services 551,890 556,273 628,225 Total net revenues $ 2,461,044 $ 2,570,756 $ 2,736,929 Net revenues from geographic areas based on the location of the Company’s service delivery centers are as follows. A portion of net revenues attributable to India consists of net revenues for services performed by delivery centers in India or at clients’ premises outside of India by business units or personnel normally based in India. Year ended December 31, 2015 2016 2017 India $ 1,687,699 $ 1,804,113 $ 1,712,783 Asia, other than India 238,529 249,839 286,338 North and Latin America 304,879 282,434 455,059 Europe 229,937 234,370 282,749 Total net revenues $ 2,461,044 $ 2,570,756 $ 2,736,929 Revenues from GE comprised 19%, 14% and 10% of the Company’s consolidated total net revenues in 2015, 2016 and 2017, respectively. No other customer accounted for 10% or more of the Company’s consolidated total net revenues during these periods. 26. Segment reporting (Continued) Property, plant and equipment, net by geographic region are as follows: As of December 31, 2016 2017 India $ 116,417 $ 125,490 Asia, other than India 13,549 15,899 North and Latin America 44,633 38,438 Europe 18,619 27,203 Total $ 193,218 $ 207,030

Related party transactions

Related party transactions	12 Months Ended
	Dec. 31, 2017
Related Party Transactions [Abstract]
Related party transactions	27. Related party transactions The Company has entered into related party transactions with its non-consolidating affiliates. The Company has also entered into related party transactions with a significant shareholder and its affiliates. The Company’s related party transactions can be categorized as follows: Revenue from services In the years ended December 31, 2015, 2016, and 2017, the Company recognized net revenues of $326, $335 and $398, respectively, from a client that is also a significant shareholder of the Company. In the years ended December 31, 2015, 2016 and 2017, the Company recognized net revenues of $7,826, $8,077 and $5,400, respectively, from a client that was a non-consolidating affiliate of the Company. As of June 30, 2017 this non-consolidating affiliate ceased to be a related party. Cost of revenue from services The Company purchases certain services from its non-consolidating affiliates, mainly relating to training and recruitment, the costs of which are included in cost of revenue. For the years ended December 31, 2015, 2016 and 2017, cost of revenue includes an amount of $2,173, $2,067 and $2,043, respectively, attributable to the cost of such services provided by the Company’s non-consolidating affiliates. Selling, general and administrative expenses The Company purchases certain services from its non-consolidating affiliates, mainly relating to training and recruitment, the costs of which are included in selling, general and administrative expenses. For the years ended December 31, 2015, 2016 and 2017, selling, general and administrative expenses include an amount of $384, $291 During the years ended December 31, 2015, 2016 and 2017, the Company engaged a significant shareholder of the Company to provide services to the Company at a cost of $421, $58 and $57, respectively. Investment in equity affiliates During the years ended December 31, 2016 and 2017, the Company made investments of $5,884 and $496, respectively, in its non-consolidating affiliates. During the year ended December 31, 2017, the Company recorded a charge of $ 2,849 related to an investment in one of its non-consolidating affiliates. This charge has been included in equity-method investment activity, net in the Company’s consolidated statement of income. 27. Related party transactions (Continued) As of December 31, 2016 and 2017, the Company’s investments in its non-consolidating affiliates amounted to $4,800 and $886, respectively. Others During the years ended December 31, 2015, 2016 and 2017, the Company entered into transactions with one of its non-consolidating affiliates for certain cost reimbursements amounting to $2,077, $1,162 and $477, respectively. During the year ended December 31, 2017, the Company entered into transactions with a client that is a significant shareholder of the Company for certain cost reimbursements amounting to $127, of which $127 is receivable as of December 31, 2017. During the year ended December 31, 2016, the Company claimed a portion of an equity affiliate’s net operating losses under consortium relief in the United Kingdom amounting to $3,291, which was outstanding and had been included in other liabilities in the company’s consolidated balance sheet as of December 31, 2016. During the year ended December 31, 2017, the Company made a payment of $3,847 to one of its non-consolidating affiliates under a tax-sharing arrangement in the U.K. This amount represents a portion of the non-consolidated affiliate’s net operating losses surrendered to the Company under the tax sharing arrangement for the years 2015 and 2016. As of June 30, 2017 this non-consolidating affiliate ceased to be a related party.

Commitments and contingencies

Commitments and contingencies	12 Months Ended
	Dec. 31, 2017
Commitments And Contingencies Disclosure [Abstract]
Commitments and contingencies	28. Commitments and contingencies Capital commitments As of December 31, 2016 and 2017, the Company has committed to spend $5,185 and $8,314, respectively, under agreements to purchase property, plant and equipment. This amount is net of capital advances paid in respect of such purchases. Bank guarantees The Company has outstanding bank guarantees amounting to $11,958 and $8,879 as of December 31, 2016 and 2017, respectively. Bank guarantees are generally provided to government agencies and excise and customs authorities for the purposes of maintaining a bonded warehouse. These guarantees may be revoked by the government agencies if they suffer any losses or damages through the breach of any of the covenants contained in the agreements governing such guarantees. Other commitments The Company’s business process delivery centers in India are 100% export-oriented units or Software Technology Parks of India (“STPI”) units under the STPI guidelines issued by the Government of India. These units are exempt from customs, central excise duties, and levies on imported and indigenous capital goods, stores, and spares. The Company has undertaken to pay custom duties, service taxes, levies, and liquidated damages payable, if any, in respect of imported and indigenous capital goods, stores, and spares consumed duty free, in the event that certain terms and conditions are not fulfilled.

Quarterly financial data (unaud

Quarterly financial data (unaudited)	12 Months Ended
	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Quarterly financial data (unaudited)	29. Quarterly financial data (unaudited) Three months ended Year ended March 31, 2017 June 30, 2017 September 30, 2017 December 31, 2017 December 31, 2017 Total net revenues $ 622,995 $ 670,697 $ 708,824 $ 734,413 $ 2,736,929 Gross profit $ 239,658 $ 255,404 $ 279,633 $ 278,530 $ 1,053,225 Income from operations $ 79,096 $ 80,031 $ 97,451 $ 72,049 $ 328,627 Income before equity method investment activity, net and income tax expense $ 69,243 $ 84,582 $ 89,742 $ 81,559 $ 325,126 Net Income $ 52,440 $ 69,102 $ 73,161 $ 66,138 $ 260,841 Net (income) loss attributable to redeemable non-controlling interest $ 898 $ (156 ) $ 584 $ 944 $ 2,270 Net income attributable to Genpact Limited common shareholders $ 53,338 $ 68,946 $ 73,745 $ 67,082 $ 263,111 Earnings per common share attributable to Genpact Limited common shareholders Basic $ 0.27 $ 0.36 $ 0.38 $ 0.35 $ 1.36 Diluted $ 0.26 $ 0.36 $ 0.38 $ 0.34 $ 1.34 Weighted average number of common shares used in computing earnings per common share attributable to Genpact Limited common shareholders Basic 199,069,528 191,469,593 192,124,366 192,795,534 193,864,755 Diluted 202,655,937 193,732,406 194,947,699 196,862,168 197,049,552 29. Quarterly financial data (unaudited) (Continued) Three months ended Year ended March 31, 2016 June 30, 2016 September 30, 2016 December 31, 2016 December 31, 2016 Total net revenues $ 609,703 $ 630,523 $ 648,783 $ 681,747 $ 2,570,756 Gross profit $ 236,855 $ 246,768 $ 256,351 $ 276,075 $ 1,016,049 Income from operations $ 75,622 $ 79,940 $ 87,124 $ 98,092 $ 340,777 Income before equity method investment activity, net and income tax expense $ 72,664 $ 81,818 $ 87,360 $ 95,502 $ 337,343 Net income $ 58,505 $ 64,788 $ 68,188 $ 76,066 $ 267,547 Net (income) loss attributable to redeemable non-controlling interest $ 289 $ 882 $ 734 $ 232 $ 2,137 Net income attributable to Genpact Limited common shareholders $ 58,794 $ 65,670 $ 68,922 $ 76,298 $ 269,684 Earnings per common share attributable to Genpact Limited common shareholders Basic $ 0.28 $ 0.31 $ 0.33 $ 0.38 $ 1.30 Diluted $ 0.27 $ 0.31 $ 0.33 $ 0.38 $ 1.28 Weighted average number of common shares used in computing earnings per common share attributable to Genpact Limited common shareholders Basic 210,780,165 210,178,050 206,146,007 200,341,922 206,861,536 Diluted 213,892,964 213,803,134 209,376,683 203,431,310 210,126,023

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2017
Subsequent Events [Abstract]
Subsequent Events	30. Subsequent Events Share Repurchase Pursuant to its share repurchase program, the Company repurchased 757,526 of its common shares between January 1, 2018 and March 1, 2018 on the open market at a weighted average price of $31.67 per share for an aggregate cash amount of $23,993. The Company repurchased 163,975 of its common shares at a weighted average price of $28.20 per share on January 17, 2018 upon final settlement of the transaction under the Company’s ASR agreement. The Company repurchased 7,092,928 of its common shares in the aggregate under the ASR agreement for an aggregate purchase price of $200,000. Dividend On February 12, 2018, the Company announced that its Board of Directors has approved a 25% increase in its quarterly cash dividend, representing a planned annual dividend of $0.30 per common share, increased from $0.24 per common share in 2017. The Board of Directors also declared a dividend for the first quarter of 2018 of $0.075 per common share, which will be paid on or about March 21, 2018 to shareholders of record as of the close of business on March 9, 2018. The declaration of any future dividends will be at the discretion of the Board of Directors.

Summary of significant accoun38

Summary of significant accounting policies (Policies)	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Basis of preparation and principles of consolidation	(a) Basis of preparation and principles of consolidation The accompanying consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (U.S. GAAP). The accompanying consolidated financial statements reflect all adjustments that management considers necessary for a fair presentation of the results of operations for these periods. The accompanying financial statements have been prepared on a consolidated basis and reflect the financial statements of Genpact Limited, a Bermuda company, and all of its subsidiaries that are more than 50% owned and controlled. When the Company does not have a controlling interest in an entity but exerts significant influence over the entity, the Company applies the equity method of accounting. All intercompany transactions and balances are eliminated in consolidation. Non-controlling interest in subsidiaries that is redeemable outside of the Company’s control for cash or other assets is reflected in the mezzanine section between liabilities and equity in the consolidated balance sheets at the redeemable value, which approximates fair value. Redeemable non-controlling interest is adjusted to its fair value at each balance sheet date. Any resulting increases or decreases in the estimated redemption amount are affected by corresponding charges to additional paid-in capital. The share of non-controlling interest in subsidiary earnings is reflected in net loss (income) attributable to redeemable non-controlling interest in the consolidated statements of income.
Use of estimates	(b) Use of estimates The preparation of consolidated financial statements in accordance with U.S. GAAP requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements. 2. Summary of significant accounting policies (Continued) Significant items subject to such estimates and assumptions include the useful lives of property, plant and equipment, intangibles and goodwill, revenue recognition, reserves for doubtful receivables, valuation allowances for deferred tax assets, the valuation of derivative financial instruments, measurements of stock-based compensation, assets and obligations related to employee benefits, and income tax uncertainties and other contingencies. Management believes that the estimates used in the preparation of the consolidated financial statements are reasonable. Although these estimates are based upon management’s best knowledge of current events and actions, actual results could differ from these estimates. Any changes in estimates are adjusted prospectively in the Company’s consolidated financial statements.
Revenue recognition	(c) Revenue recognition The Company derives its revenue primarily from business process outsourcing and information technology services, which are provided on a time-and-material, transaction or fixed-price basis. The Company recognizes revenue when persuasive evidence of an arrangement exists, the sales price is fixed or determinable, services have been rendered and collectability is reasonably assured. Revenues from services rendered under time-and-materials and transaction-based contracts are recognized as the services are provided. The Company’s fixed-price contracts include contracts for application development, maintenance and support services. Revenues from these contracts are recognized ratably over the term of the agreement. The Company accrues for revenue and unbilled receivables for the services rendered between the last billing date and the balance sheet date. Customer contracts can also include incentive payments received for discrete benefits delivered to clients. Revenues relating to such incentive payments are recorded when the contingency is satisfied and the Company concludes the amounts are earned. Revenue from fixed-price contracts for the development of software and related services is recognized in accordance with the percentage-of-completion method. Guidance has been drawn from Financial Accounting Standards Board (“FASB”) guidance on Software—Revenue Recognition to account for revenue from fixed-price arrangements for software development and related services in conformity with FASB guidance on Revenue Recognition—Construction—Type and Production-Type Contracts. The input (effort or cost expended) method has been used to measure progress towards completion as there is a direct relationship between input and productivity. Provisions for estimated losses, if any, on uncompleted contracts are recorded in the period in which such losses become probable based on the current contract estimates. The Company has deferred the revenue and costs attributable to certain process transition activities with respect to its customers where such activities do not represent the culmination of a separate earnings process. Such revenue and costs are subsequently recognized ratably over the period in which the related services are performed. Further, the deferred costs are limited to the amount of the deferred revenues. Revenues are reported net of value-added tax, business tax and applicable discounts and allowances. Reimbursements of out-of-pocket expenses received from clients have been included as part of revenues. The Company enters into multiple-element revenue arrangements in which a client may purchase a combination of its services. Revenue from multiple-element arrangements is recognized, for each element, based on (1) the attainment of the delivery criterion; (2) its fair value, which is determined using the selling price hierarchy of vendor-specific objective evidence (“VSOE”) of fair value, third-party evidence or best estimated selling price, as applicable, and (3) its allocated selling price, which is based on the relative sales price method.
Accounts receivable	2. Summary of significant accounting policies (Continued) (d) Accounts receivable Accounts receivable are recorded at the invoiced or to be invoiced amount and do not bear interest. Amounts collected on trade accounts receivable are included in net cash provided by operating activities in the consolidated statements of cash flows. The Company maintains an allowance for doubtful accounts for estimated losses inherent in its accounts receivable portfolio. In establishing the required allowance, management considers historical losses adjusted to take into account current market conditions and clients’ financial conditions, the amount of receivables in dispute, and the current receivables’ aging and current payment patterns. Account balances are charged off against the allowance after all means of collection have been exhausted and the potential for recovery is considered remote. The Company does not have any off-balance-sheet credit exposure related to its clients.
Cash and cash equivalents	(e) Cash and cash equivalents Cash and cash equivalents consist of cash and bank balances and all highly liquid investments purchased with an original maturity of three months or less.
Short- term investments	(f) Short-term investments All liquid investments with an original maturity greater than 90 days but less than one year are considered to be short-term investments. Marketable short-term investments are classified and accounted for as available-for-sale investments. Available-for-sale investments are reported at fair value with changes in unrealized gains and losses recorded as a separate component of other comprehensive income (loss) until realized. Realized gains and losses on investments are determined based on the specific identification method and are included in “Other income (expense), net.” The Company does not hold these investments for speculative or trading purposes.
Property, plant and equipment, net	(g) Property, plant and equipment, net Property, plant and equipment are stated at cost less accumulated depreciation and amortization. Expenditures for replacements and improvements are capitalized, whereas the costs of maintenance and repairs are charged to earnings as incurred. The Company depreciates and amortizes all property, plant and equipment using the straight-line method over the following estimated economic useful lives of the assets: Years Buildings 40 Furniture and fixtures 4 Computer equipment and servers 4 Plant, machinery and equipment 4 Computer software 4-7 Leasehold improvements Lesser of lease period or 10 Years Vehicles 3-4 The Company capitalizes certain computer software incurred in connection with developing or obtaining computer software for internal use when both the preliminary project stage is completed and it is probable that the software will be used as intended. Capitalized software costs include only (i) external direct costs of materials and services utilized in developing or obtaining computer software, (ii) compensation and related benefits for employees who are directly associated with the software project, and (iii) interest costs incurred while developing internal-use computer software. 2. Summary of significant accounting policies (Continued) Capitalized software costs are included in property, plant and equipment on the Company’s balance sheet and amortized on a straight-line basis when placed into service over the estimated useful lives of the software. Advances paid towards the acquisition of property, plant and equipment outstanding as of each balance sheet date and the cost of property, plant and equipment not put to use before such date are disclosed under “Capital work in progress.
Business combinations	(h) Business combinations, goodwill and other intangible assets The Company accounts for its business combinations using the acquisition method of accounting in accordance with ASC 805, Business Combinations, by recognizing the identifiable tangible and intangible assets acquired and liabilities assumed, and any non-controlling interest in the acquired business, measured at their acquisition date fair values. Contingent consideration is included within the acquisition cost and is recognized at its fair value on the acquisition date. A liability resulting from contingent consideration is remeasured to fair value as of each reporting date until the contingency is resolved. Changes in fair value are recognized in earnings. All assets and liabilities of the acquired businesses, including goodwill, are assigned to reporting units. Acquisition-related costs are expensed as incurred under Selling, General and Administrative Expenses. In business combinations, where the fair value of identifiable tangible and intangible net assets purchased exceeds the cost of the acquired business, the Company recognizes the resulting gain under “Other operating (income) expense, net” in the Consolidated Statements of Income.
Goodwill	Goodwill represents the cost of acquired businesses in excess of the fair value of identifiable tangible and intangible net assets purchased. Goodwill is not amortized but is tested for impairment at least on an annual basis on December 31, based on a number of factors, including operating results, business plans and future cash flows. The Company performs an assessment of qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not that the fair value of a reporting unit is less than its carrying amount. Based on the assessment of events or circumstances, the Company performs a quantitative assessment of goodwill impairment if it determines that it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If, based on the quantitative impairment analysis, the carrying value of the goodwill of a reporting unit exceeds the fair value of such goodwill, an impairment loss is recognized in an amount equal to the excess. In addition, the Company performs a qualitative assessment of goodwill impairment between annual tests if an event occurs or circumstances change that would more likely than not reduce the fair value of a reporting unit below its carrying amount. See Note 10 for information and related disclosures.
Other Intangible Assets	Intangible assets including technology acquired / developed individually or with a group of other assets or in a business combination are carried at cost less accumulated amortization based on their estimated useful lives as follows: Customer-related intangible assets 1-14 years Marketing-related intangible assets 1-10 years Technology-related intangible assets 2-8 years Other intangible assets 3-5 years Intangible assets are amortized over their estimated useful lives using a method of amortization that reflects the pattern in which the economic benefits of the intangible assets are consumed or otherwise realized. 2. Summary of significant accounting policies (Continued) The Company also capitalizes certain software and technology development costs incurred in connection with developing or obtaining software or technology for sale/lease to customers when the initial design phase is completed and commercial and technological feasibility has been established. Any development cost incurred before technological feasibility is established is expensed as incurred as research and development costs. Technological feasibility is established upon completion of a detailed design program or, in its absence, completion of a working model. Capitalized software and technology costs include only (i) external direct costs of materials and services utilized in developing or obtaining software and technology and (ii) compensation and related benefits for employees who are directly associated with the project. Costs incurred in connection with developing or obtaining software or technology for sale/lease to customers which are under development and not put to use are disclosed under “intangible under development.” Capitalized software and technology costs are included in intangible assets under technology-related intangible assets on the Company’s balance sheet and amortized on a straight-line basis when placed into service over the estimated useful lives of the software and technology.
Impairment of long-lived assets	(i) Impairment of long-lived assets Long-lived assets, including certain intangible assets, to be held and used are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of such assets may not be recoverable. Such assets are required to be tested for impairment if the carrying amount of the assets is higher than the future undiscounted net cash flows expected to be generated from the assets. The impairment amount to be recognized is measured as the amount by which the carrying value of the assets exceeds their fair value. The Company determines fair value by using a discounted cash flow approach.
Foreign currency	(j) Foreign currency The Company’s consolidated financial statements are reported in U.S. dollars, the Company’s functional currency. The functional currency for the Company’s subsidiaries organized in Europe, other than the United Kingdom, the Czech Republic, Luxembourg and one subsidiary in Poland, is the euro, and the functional currencies of the Company’s subsidiaries organized in Brazil, China, Colombia, Guatemala, India, Israel, Japan, Morocco, South Africa, the Philippines, the United Kingdom, Poland, the Czech Republic, Hong Kong, Singapore, Australia, Canada and United Arab Emirates are their respective local currencies. The functional currency of all other Company subsidiaries is the U.S. dollar. The translation of the functional currencies of the Company’s subsidiaries into U.S. dollars is performed for balance sheet accounts using the exchange rates in effect as of the balance sheet date and for revenues and expense accounts using a monthly average exchange rate prevailing during the respective period. The gains or losses resulting from such translation are reported as currency translation adjustments under other comprehensive income (loss), net, under accumulated other comprehensive income (loss) as a separate component of equity. Monetary assets and liabilities of each subsidiary denominated in currencies other than the subsidiary’s functional currency are translated into their respective functional currency at the rates of exchange prevailing on the balance sheet date. Transactions of each subsidiary in currencies other than the subsidiary’s functional currency are translated into the respective functional currencies at the average monthly exchange rate prevailing during the period of the transaction. The gains or losses resulting from foreign currency transactions are included in the consolidated statements of income.
Derivative instruments and hedging activities	2. Summary of significant accounting policies (Continued) (k) Derivative instruments and hedging activities In the normal course of business, the Company uses derivative financial instruments to manage fluctuations in foreign currency exchange rates and interest rate fluctuation. The Company purchases forward foreign exchange contracts to mitigate the risk of changes in foreign exchange rates on intercompany transactions and forecasted transactions denominated in foreign currencies and interest rate swaps to mitigate interest rate fluctuation risk on its indebtedness. The Company recognizes derivative instruments and hedging activities as either assets or liabilities in its consolidated balance sheets and measures them at fair value. Gains and losses resulting from changes in fair value are accounted for depending on the use of the derivative and whether it is designated and qualifies for hedge accounting. Changes in the fair values of derivatives designated as cash flow hedges are deferred and recorded as a component of other comprehensive income (loss) reported under accumulated other comprehensive income (loss) until the hedged transactions occur and are then recognized in the consolidated statements of income along with the underlying hedged item and disclosed as part of “Total net revenues,” “Cost of revenue,” “Selling, general and administrative expenses,” and “Interest expense,” as applicable. Changes in the fair value of derivatives not designated as hedging instruments and the ineffective portion of derivatives designated as cash flow hedges are recognized in the consolidated statements of income and are included in foreign exchange gains (losses), net, and other income (expense), net, respectively. With respect to derivatives designated as hedges, the Company formally documents all relationships between hedging instruments and hedged items, as well as its risk management objectives and strategy for undertaking various hedge transactions. The Company also formally assesses, both at the inception of the hedge and on a quarterly basis, whether each derivative is highly effective in offsetting changes in fair values or cash flows of the hedged item. If it is determined that a derivative or portion thereof is not highly effective as a hedge, or if a derivative ceases to be a highly effective hedge, the Company will prospectively discontinue hedge accounting with respect to that derivative. In all situations in which hedge accounting is discontinued and the derivative is retained, the Company continues to carry the derivative at its fair value on the balance sheet and recognizes any subsequent change in its fair value in the consolidated statements of income. When it is probable that a forecasted transaction will not occur, the Company discontinues hedge accounting and recognizes immediately, in foreign exchange gains (losses), net in the consolidated statements of income, the gains and losses attributable to such derivative that were accumulated in other comprehensive income (loss).
Income taxes	(l) Income taxes The Company accounts for income taxes using the asset and liability method of accounting for income taxes. Under this method, income tax expense is recognized for the amount of taxes payable or refundable for the current year. In addition, deferred tax assets and liabilities are recognized for future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their tax bases and all operating loss and tax credit carry forwards, if any. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates or tax status is recognized in the statement of income in the period that includes the enactment date or the filing or approval date of the tax status change. Deferred tax assets are reduced by a valuation allowance if, based on the weight of available evidence, it is more likely than not that some portion or all of the deferred tax assets will not be realized. 2. Summary of significant accounting policies (Continued) The Company applies a two-step approach for recognizing and measuring the benefit of tax positions. The first step is to evaluate the tax position for recognition by determining, based on the technical merits, that the position will more likely than not be sustained upon examination. The second step is to measure the tax benefit as the largest amount of the tax benefit that is greater than 50 percent likely of being realized upon settlement. The Company includes interest and penalties related to unrecognized tax benefits within income tax expense.
Employee benefit plans	(m) Employee benefit plans Contributions to defined contribution plans are charged to consolidated statements of income in the period in which services are rendered by the covered employees. Current service costs for defined benefit plans are accrued in the period to which they relate. The liability in respect of defined benefit plans is calculated annually by the Company using the projected unit credit method. Prior service cost, if any, resulting from an amendment to a plan is recognized and amortized over the remaining period of service of the covered employees. The Company recognizes its liabilities for compensated absences dependent on whether the obligation is attributable to employee services already rendered, relates to rights that vest or accumulate and payment is probable and estimable. The Company records annual amounts relating to its defined benefit plans based on calculations that incorporate various actuarial and other assumptions, including discount rates, mortality, assumed rates of return, compensation increases and turnover rates. The Company reviews its assumptions on an annual basis or quarterly basis and makes modifications to the assumptions based on current rates and trends when it is appropriate to do so. The effect of modifications to those assumptions is recorded in other comprehensive income (loss) and amortized to net periodic cost over future periods using the corridor method. The Company believes that the assumptions utilized in recording its obligations under its plans are reasonable based on its experience and market conditions.
Stock-based compensation	(n) Stock-based compensation The Company recognizes and measures compensation expense for all stock-based awards based on the grant date fair value. For option awards, grant date fair value is determined under the option-pricing model (Black-Scholes-Merton) and for awards other than option awards, grant date fair value is determined on the basis of the fair market value of a Company common share on the date of grant of such awards. The Company recognizes compensation expense for stock-based awards net of estimated forfeitures. Stock-based compensation recognized in the consolidated statements of income for the years ended December 31, 2015, 2016 and 2017 is based on awards ultimately expected to vest. As a result, the expense has been reduced for estimated forfeitures. Forfeitures are estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from such estimates.
Accelerated Share Repurchase	(o) Accelerated Share Repurchase The Company entered into an accelerated share repurchase (“ASR”) agreement with a third-party financial institution to repurchase shares of the Company’s common stock. Under the ASR agreement, the Company paid a specified amount to the financial institution and received an initial delivery of shares. Upon an interim delivery and settlement of the ASR agreement, the financial institution delivered additional shares, with the final number of shares delivered determined with reference to the volume-weighted average price of the Company’s common stock over the term of the agreement, less an agreed-upon discount. The transactions are accounted for as equity transactions. All repurchased shares are retired. When the shares are received, there is an immediate reduction in the weighted-average common shares calculation for basic and diluted earnings per share.
Government incentives	2. Summary of significant accounting policies (Continued) (p) Government incentives The Company recognizes incentives in the consolidated statement of income to match them with the expenditures for which they are intended to compensate. Incentives are recognized in the income statement when there is reasonable assurance that the Company will comply with the conditions for their receipt and a reasonable expectation that the funds will be received. In certain circumstances, the receipt of an incentive may not be subject to any condition or requirement to incur further costs, in which case the incentive is recognized in the income statement for the period in which it becomes receivable. In the event that it becomes likely that the Company will be required to repay an incentive that has already been recognized, the Company makes a provision for the estimated liability.
Financial instruments and concentration of credit risk	(q) Financial instruments and concentration of credit risk Financial instruments that potentially subject the Company to concentration of credit risk are reflected principally in cash and cash equivalents, derivative financial instruments and accounts receivable. The Company places its cash and cash equivalents and derivative financial instruments with corporations and banks with high investment grade ratings, limits the amount of credit exposure with any one corporation or bank and conducts ongoing evaluations of the creditworthiness of the corporations and banks with which it does business. To reduce its credit risk on accounts receivable, the Company conducts ongoing credit evaluations of its clients. GE accounted for 15% and 11% of the Company’s receivables as of December 31, 2016 and 2017, respectively. GE accounted for 19%, 14% and 10% of the Company’s revenues in the years ended December 31, 2015, 2016 and 2017, respectively.
Earnings (loss) per share	(r) Earnings (loss) per share Basic earnings per share is computed using the weighted average number of common shares outstanding during the period. Diluted earnings per share is computed using the weighted average number of common and dilutive common equivalent shares outstanding during the period. For the purposes of calculating diluted earnings per share, the treasury stock method is used for stock-based awards except where the results would be anti-dilutive.
Commitments and contingencies	(s) Commitments and contingencies Liabilities for loss contingencies arising from claims, assessments, litigation, fines and penalties, and other sources are recorded when it is probable that a liability has been incurred and the amount of the assessment and/or remediation can be reasonably estimated. Legal costs incurred in connection with such liabilities are expensed as incurred.
Recently issued accounting pronouncements	(t) Recently issued accounting pronouncements The authoritative bodies release standards and guidance which are assessed by management for impact on the company’s consolidated financial statements. The following recently released accounting standard has been adopted by the Company: In March 2016, the FASB issued ASU 2016-09, Compensation—Stock Compensation (Topic 718): Improvement to Employee Share-Based Payment Accounting. The new standard contains several amendments that will simplify the accounting for employee share-based payment transactions, including the accounting for income taxes, forfeitures, statutory tax withholding requirements, classification of awards as either equity or liabilities, and classification on the statement of cash flows. The changes in the new standard eliminate the requirement for excess tax benefits to be recognized in additional paid-in capital and tax deficiencies recognized either in income tax expense or in additional paid-in capital. In the quarter ended December 31, 2016, the Company elected to early adopt ASU 2016-09 effective January 1, 2016 and applied ASU 2016-09 using a modified retrospective approach. The treatment of forfeitures has not changed as the Company is electing to continue its current process of estimating the number of forfeitures. With the early adoption of ASU 2016-09, the Company has elected to present the cash flow statement on a prospective transition method and no prior periods have been adjusted. 2. Summary of significant accounting policies (Continued) In addition, the following recently released accounting standards have been adopted by the Company. Adoption of these standards did not have a material impact on the Company’s consolidated results of operations, cash flows, financial position or disclosures: Effective January 1, 2016, the Company adopted FASB ASU 2015-01 (Topic 225): Simplifying Income Statement Presentation by Eliminating the Concept of Extraordinary Items (“ASU 2015-01”). Such items are defined as transactions or events that are both unusual in nature and infrequent in occurrence, and, currently, are required to be presented separately in the income statement, net of income tax, after income from continuing operations. The changes eliminate the concept of an extraordinary item and, therefore, the presentation of such items will no longer be required. Notwithstanding this change, the Company will still be required to present and disclose a transaction or event that is both unusual in nature and infrequent in occurrence in the notes to the consolidated financial statements. Effective January 1, 2016, the Company adopted FASB ASU 2015-16 (Topic 805), Business Combinations (“ASU 2015-16”), which eliminates the requirement for an acquirer in a business combination to account for measurement-period adjustments retrospectively. The guidance requires that the acquirer shall recognize adjustments to provisional amounts that are identified during the measurement period in the reporting period in which the adjustment amounts are determined. Effective January 1, 2016, the Company adopted FASB ASU 2015-02. In February 2015, the FASB issued ASU No. 2015-02, Amendment to the Consolidation Analysis, which specifies changes to the analysis that an entity must perform to determine whether it should consolidate certain types of legal entities. These changes (i) modify the evaluation of whether limited partnerships and similar legal entities are variable interest entities or voting interest entities, (ii) eliminate the presumption that a general partner should consolidate a limited partnership, (iii) affect the consolidation analysis of reporting entities that are involved with variable interest entities, particularly those that have fee arrangements and related party relationships, and (iv) provide a scope exception from consolidation guidance for reporting entities with interests in legal entities that are required to comply with or operate in accordance with requirements that are similar to those in Rule 2a-7 of the Investment Company Act of 1940 for registered money market funds. Effective January 1, 2017, the Company adopted FASB ASU 2016-06, Derivatives and Hedging (Topic 815). The amendments in this update clarify the requirements for assessing whether contingent call (put) options that can accelerate the payment of principal on debt instruments are clearly and closely related to their debt hosts. An entity performing the assessment under the amendments in this update is required to assess the embedded call (put) options solely in accordance with a four-step decision sequence. 2. Summary of significant accounting policies (Continued) The following recently released accounting standards have not yet been adopted by the Company: In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers, which will replace most existing revenue recognition guidance in U.S. GAAP. The core principle of the ASU is that an entity should recognize revenue for the transfer of goods or services equal to the amount that it expects to be entitled to receive for those goods or services. The ASU requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments. Subsequently, the FASB issued ASU No. 2017-13, in September 2017, ASU No. 2016-08, “Principal versus Agent Considerations (Reporting Gross versus Net),” in March 2016, ASU No. 2016-10, “Identifying performance obligations and licensing,” in April 2016, and ASU 2016-20 “Technical Corrections and Improvements to Topic 606, Revenue from Contracts with Customers” in December 2016, which amend and clarify ASU 2014-09. These ASUs will be effective for the Company beginning January 1, 2018, including interim periods in the fiscal year 2018, and allow for both retrospective and prospective adoption. The Company has performed an assessment of the impact of the ASU and developed a transition plan, including necessary changes to policies, processes, and internal controls as well as system enhancements to generate the information necessary for the new disclosures. The implementation plan is on schedule for adoption on January 1, 2018 and the Company will apply the cumulative effect method as its transition approach. The Company expects revenue recognition across the portfolio of services to remain largely unchanged, however there will be an impact on the timing of recognition of certain contract costs, which will now be amortized over the contract period rather than expensed as incurred. Based on the analysis completed to date, the Company does not currently expect that the ASU will have a material impact on consolidated revenue in its Consolidated Financial Statements. In February 2016, the FASB issued ASU No. 2016-02, “Leases.” The core principle of the ASU is that a lessee should recognize the assets and liabilities that arise from its leases other than those that meet the definition of a short-term lease. The ASU requires extensive qualitative and quantitative disclosures, including with respect to significant judgments made by management. Subsequently, the FASB issued ASU No. 2017-13, in September 2017 and ASU No. 2018-01, in January 2018, which amends and clarifies ASU 2016-02. The ASU will be effective for the Company beginning January 1, 2019, including interim periods in the fiscal year 2019. Early adoption is permitted. The Company is in the process of determining the method of adoption and assessing the impact of this ASU on its consolidated results of operations, cash flows, financial position and disclosures. In October 2016, the FASB issued ASU 2016-16, “Intra-Entity Transfers of Assets Other Than Inventory.” The new guidance eliminates the exception for deferment of tax recognition until the transferred asset is sold to a third party or otherwise recovered through use for all intra-entity sales of assets other than inventory. The ASU is effective for the Company beginning January 1, 2018, including interim periods in the fiscal year 2018. Early adoption is permitted. The Company does not expect the adoption of this update to have a material impact on its consolidated results of operations, cash flows, financial position or disclosures. In January 2017, the FASB issued ASU 2017-01, “Business Combinations (Topic 805): Clarifying the Definition of a Business.” The new guidance revises the definition of a business. The definition of a business affects many areas of accounting (e.g., acquisitions, disposals, goodwill impairment, consolidation). The ASU is effective for the Company beginning January 1, 2018, including interim periods in the fiscal year 2018. Early adoption is permitted. The Company adopted this ASU on the effective date and will apply the guidance prospectively. The Company does not expect the adoption of this update to have a material impact on its consolidated results of operations, cash flows, financial position or disclosures. 2. Summary of significant accounting policies (Continued) In March 2017, the FASB issued ASU 2017-07, “Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost.” The ASU requires entities to (1) disaggregate the current-service-cost component from the other components of net benefit cost (the “other components”) and present it with other current compensation costs for related employees in the income statement and (2) present the other components elsewhere in the income statement and outside of income from operations if that subtotal is presented. In addition, the ASU requires entities to disclose the income statement lines that contain the other components if they are not presented on appropriately described separate lines. The ASU is effective for the Company beginning January 1, 2018, including interim periods in the fiscal year 2018. The Company adopted this ASU on the effective date and does not expect the adoption of this update to have a material impact on its consolidated results of operations, cash flows, financial position or disclosures. In August 2017, the FASB issued ASU 2017-12, “Derivatives and Hedging.” The amendment expands an entity’s ability to hedge accounting to nonfinancial and financial risk components and requires changes in fair value of hedging instruments to be presented in the same income statement line as the hedged item. The ASU also amends the presentation and disclosure requirements for the effect of hedge accounting. The ASU must be adopted using a modified retrospective approach with a cumulative effect adjustment recorded to the opening balance of retained earnings as of the initial application date. The ASU is effective for the Company beginning January 1, 2019, including interim periods in the fiscal year 2019. Early adoption is permitted. The Company is in the process of assessing the impact of this ASU on its consolidated results of operations, cash flows, financial position and disclosures. In February 2018, the FASB issued ASU 2018-02, “Income Statement—Reporting Comprehensive Income.” The amendments allow a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act. The amendments in this Update also require certain disclosures about stranded tax effects. The ASU should be applied either in the period of adoption or retrospectively to each period (or periods) in which the effect of the change in the U.S. federal corporate income tax rate in the Tax Cuts and Jobs Act was recognized. The ASU is effective for the Company beginning January 1, 2019, including interim periods in the fiscal year 2019. Early adoption is permitted. The Company is in the process of assessing the impact of this ASU on its consolidated results of operations, cash flows, financial position and disclosures. There was no adoption of the provision of ASU 2018-02 in the Financial Statements for the year ended December 31, 2017.
Reclassification	(v) Reclassification Certain reclassifications have been made in the consolidated financial statements of prior periods to conform to the classification used in the current period. The impact of such reclassifications on the consolidated financial statements is not material.

Summary of significant accoun39

Summary of significant accounting policies (Tables)	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Schedule of Estimated Economic Useful Lives of Property Plant and Equipment	The Company depreciates and amortizes all property, plant and equipment using the straight-line method over the following estimated economic useful lives of the assets: Years Buildings 40 Furniture and fixtures 4 Computer equipment and servers 4 Plant, machinery and equipment 4 Computer software 4-7 Leasehold improvements Lesser of lease period or 10 Years Vehicles 3-4
Estimated Useful Lives of Intangible Assets Acquired/Developed	Intangible assets including technology acquired / developed individually or with a group of other assets or in a business combination are carried at cost less accumulated amortization based on their estimated useful lives as follows: Customer-related intangible assets 1-14 years Marketing-related intangible assets 1-10 years Technology-related intangible assets 2-8 years Other intangible assets 3-5 years

Business acquisitions (Tables)

Business acquisitions (Tables)	12 Months Ended
	Dec. 31, 2017
Atyati Technologies Private Limited
Summary of Calculation of Gain (Loss) on Sale of Business	3. Business acquisitions (Continued) The Company recorded a gain of $5,214 in its consolidated statement of income in connection with the sale of Atyati, calculated as follows: Net sale proceeds $ 17,155 Net assets of the business, including intangible assets, allocated goodwill and the translation impact thereof 11,941 Gain on divestiture included in other income (expense), net $ 5,214
Europe | IT Support Business
Summary of Calculation of Gain (Loss) on Sale of Business	The Company recorded a loss of $5,668 in its consolidated statement of income in connection with the sale of the Business, calculated as follows: Net sale proceeds $ — Net assets of the business, including the translation impact thereof 5,569 Selling expenses 99 Loss on divestiture included in other income (expense), net $ 5,668
Other Acquisitions
Summary of Acquisition Date, Goodwill Reporting Unit and Tax Deductibility of Goodwill of Each Acquisition	The following table sets forth, with respect to each of the five acquisitions, the acquisition date, goodwill reporting unit and the tax deductibility of the goodwill: Acquisition Acquisition date Goodwill reporting unit Tax deductibility of goodwill U.S. Delivery Center October 16, 2017 India Deductible OnSource July 18, 2017 India Deductible Birlasoft July 18, 2017 IT Services Deductible Fiserv May 11, 2017 India Non-deductible Lease Dimensions February 15, 2017 Americas Non-deductible

Cash and cash equivalents (Tabl

Cash and cash equivalents (Tables)	12 Months Ended
	Dec. 31, 2017
Cash And Cash Equivalents [Abstract]
Cash And Cash Equivalents	As of December 31, 2016 2017 Cash and other bank balances $ 422,623 $ 504,468 Total $ 422,623 $ 504,468

Accounts receivable, net of r42

Accounts receivable, net of reserve for doubtful receivables (Tables)	12 Months Ended
	Dec. 31, 2017
Receivables [Abstract]
Reserve for Doubtful Receivables	The following table provides details of the Company’s reserve for doubtful receivables: Year ended December 31, 2015 2016 2017 Opening balance as of January 1 $15,192 $ 11,530 $ 15,519 Additions due to acquisitions — — 235 Additions charged to cost and expense 2449 7,282 9,819 Deductions/effect of exchange rate fluctuations (6,111 ) (3,293 ) (1,913 ) Closing balance $ 11,530 $ 15,519 $ 23,660

Fair value measurements (Tables

Fair value measurements (Tables)	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Fair Value of Assets and Liabilities Measured on Recurring Basis	The Company measures certain financial assets and liabilities, including derivative instruments, at fair value on a recurring basis. The fair value measurements of these financial assets and liabilities were determined using the following inputs as of December 31, 2016 and 2017: As of December 31, 2016 Fair Value Measurements at Reporting Date Using Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Other Unobservable Inputs Total (Level 1) (Level 2) (Level 3) Assets Derivative instruments (Notes a, c) $ 55,386 $ — $ 55,386 $ — Total $ 55,386 $ — $ 55,386 $ — Liabilities Earn-out consideration (Notes b, d) $ 22,435 $ — $ — $ 22,435 Derivative instruments (Notes b, c) 17,353 — 17,353 — Total $ 39,788 $ — $ 17,353 $ 22,435 Redeemable non-controlling interest (Note e) $ 4,520 $ — $ — $ 4,520 As of December 31, 2017 Fair Value Measurements at Reporting Date Using Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Other Unobservable Inputs Total (Level 1) (Level 2) (Level 3) Assets Derivative instruments (Notes a, c) $ 73,098 $ — $ 73,098 $ — Total $ 73,098 $ — $ 73,098 $ — Liabilities Earn-out consideration (Notes b, d) $ 24,732 $ — $ — $ 24,732 Derivative instruments (Notes b, c) 18,188 — 18,188 — Total $ 42,920 $ — $ 18,188 $ 24,732 Redeemable non-controlling interest (Note e) $ 4,750 $ — $ — $ 4,750 (a) Included in prepaid expenses and other current assets and other assets in the consolidated balance sheets. (b) Included in accrued expenses and other current liabilities and other liabilities in the consolidated balance sheets. (c) The Company values its derivative instruments based on market observable inputs, including both forward and spot prices for the relevant currencies and interest rate indices for relevant interest rates. The quotes are taken from an independent market database. (d) The fair value of earn-out consideration, calculated as the present value of expected future payments to be made to the sellers of acquired businesses, was derived by estimating the future financial performance of the acquired businesses using the earn-out formula and performance targets specified in each purchase agreement and adjusting the result to reflect the Company’s estimate of the likelihood of achievement of such targets. Given the significance of the unobservable inputs, the valuations are classified in level 3 of the fair value hierarchy. 6. Fair Value Measurements (continued) (e) The Company’s estimate of the fair value of redeemable non-controlling interest as of December 31, 2017 is based on unobservable inputs considering the assumptions that market participants would make in pricing the obligation. Given the significance of the unobservable inputs, the valuation was classified in level 3 of the fair value hierarchy. Refer to Note 3—Business Acquisitions.
Fair Value of Earn-out Consideration	The following table provides a roll-forward of the fair value of earn-out consideration categorized as level 3 in the fair value hierarchy for the years ended December 31, 2016 and 2017: As of December 31 2016 2017 Opening balance $ 22,820 $ 22,435 Earn-out consideration payable in connection with acquisitions 14,550 10,720 Payments made of earn-out consideration (1,611 ) (7,239 ) Change in fair value (note a) (14,869 ) (3,695 ) Other (note b) 1,545 2,511 Ending balance $ 22,435 $ 24,732 (a) Changes in the fair value of earn-out consideration are reported in other operating (income) expense, net in the consolidated statements of income. (b) Interest expense is included in interest income (expense), net and the impact of changes in foreign exchange is reported in foreign exchange gains (losses), net in the consolidated statements of income. The cumulative translation adjustment is reported as a component of other comprehensive income (loss).

Derivative financial instrume44

Derivative financial instruments (Tables)	12 Months Ended
	Dec. 31, 2017
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Aggregate Notional Principal Amounts of Outstanding Derivative Financial Instruments with Related Balance Sheet Exposure	The following table presents the aggregate notional principal amounts of outstanding derivative financial instruments together with the related balance sheet exposure: Notional principal amounts (note a) Balance sheet exposure asset (liability) (note b) As of December 31, 2016 As of December 31, 2017 As of December 31, 2016 As of December 31, 2017 Foreign exchange forward contracts denominated in: United States Dollars (sell) Indian Rupees (buy) $ 1,108,400 $ 1,289,400 $ 6,669 $ 54,398 United States Dollars (sell) Mexican Peso (buy) 9,120 9,000 (187 ) (441 ) United States Dollars (sell) Philippines Peso (buy) 70,050 76,650 (1,036 ) 69 Euro (sell) United States Dollars (buy) 138,613 170,542 9,180 (2,069 ) Pound Sterling (buy) United States Dollars (sell) — 24,041 — 253 Euro (sell) Romanian Leu (buy) 29,805 35,826 (152 ) (892 ) Japanese Yen (sell) Chinese Renminbi (buy) 77,267 60,768 (742 ) 1,918 Pound Sterling (sell) United States Dollars (buy) 104,142 80,871 14,228 (2,478 ) Australian Dollars (sell) United States Dollars (buy) 114,412 136,092 2,328 (5,180 ) Interest rate swaps (floating to fixed) 456,810 432,117 7,746 9,332 $ 38,034 $ 54,910 (a) Notional amounts are key elements of derivative financial instrument agreements but do not represent the amount exchanged by counterparties and do not measure the Company’s exposure to credit, foreign exchange, interest rate or other market risks. However, the amounts exchanged are based on the notional amounts and other provisions of the underlying derivative financial instrument agreements. (b) Balance sheet exposure is denominated in U.S. dollars and denotes the mark-to-market impact of the derivative financial instruments on the reporting date.
Fair Values of Derivative Instruments and Location in Financial Statements	7. Derivative financial instruments (Continued) The fair values of the Company’s derivative instruments and their location in the Company’s financial statements are summarized in the table below: Cash flow hedges Non-designated As of December 31, 2016 As of December 31, 2017 As of December 31, 2016 As of December 31, 2017 Assets Prepaid expenses and other current assets $ 33,921 $ 43,557 $ 809 $ 4,635 Other assets $ 20,657 $ 24,906 $ — $ — Liabilities Accrued expenses and other current liabilities $ 4,540 $ 10,092 $ 237 $ 254 Other liabilities $ 12,576 $ 7,842 $ — $ —
Cash Flow Hedges, Gains (Losses) Recorded as Component of Other Comprehensive Income (Loss) or Other Comprehensive Income	In connection with cash flow hedges, the gains (losses) recorded as a component of other comprehensive income (loss), or OCI, and the related tax effects are summarized below: Year ended December 31, 2015 2016 2017 Before- Tax amount Tax (Expense) or Benefit Net of tax Amount Before- Tax amount Tax (Expense) or Benefit Net of tax Amount Before- Tax amount Tax (Expense) or Benefit Net of tax Amount Opening balance $ (66,786 ) $ 23,646 $ (43,140 ) $ (30,090 ) $ 9,830 $ (20,260 ) $ 37,461 $ (13,979 ) $ 23,482 Net gains (losses) reclassified into statement of income on completion of hedged transactions (42,106 ) 15,346 (26,760 ) (6,799 ) 409 (6,390 ) 54,494 (17,725 ) 36,769 Changes in fair value of effective portion of outstanding derivatives, net (5,410 ) 1,530 (3,880 ) 60,752 (23,400 ) 37,352 67,562 (18,182 ) 49,380 Gain (loss) on cash flow hedging derivatives, net 36,696 (13,816 ) 22,880 67,551 (23,809 ) 43,742 13,068 (457 ) 12,611 Closing balance $ (30,090 ) $ 9,830 $ (20,260 ) $ 37,461 $ (13,979 ) $ 23,482 $ 50,529 $ (14,436 ) $ 36,093
Gains (Losses) Recorded as Component of Other Comprehensive Income (Loss) or Other Comprehensive Income	7. Derivative financial instruments (Continued) The gains or losses recognized in other comprehensive income (loss) and their effects on financial performance are summarized below: Derivatives in Cash Flow Hedging Relationships Amount of Gain (loss) recognized in OCI on Derivatives (Effective Portion) Location of Gain (loss) reclassified from OCI into Statement of Income (Effective Portion) Amount of Gain (loss) reclassified from OCI into Statement of Income (Effective Portion) Year ended December 31, Year ended December 31, 2015 2016 2017 2015 2016 2017 Forward foreign exchange contracts $ (5,410 ) $ 54,664 $ 66,037 Revenue $ 13,667 $ 12,859 $ 5,858 Interest rate swaps $ — $ 6,088 $ 1,525 Cost of revenue $ (44,634 ) $ (14,223 ) $ 37,849 Selling, general and administrative expenses $ (11,139 ) $ (3,765 ) $ 10,849 Interest expense $ — $ (1,670 ) $ (62 ) $ (5,410 ) $ 60,752 $ 67,562 $ (42,106 ) $ (6,799 ) $ 54,494 Gain (loss) recognized in income on the ineffective portion of derivatives and the amount excluded from effectiveness testing is $0 as of December 31, 2015, 2016 and 2017. Non-designated Hedges Derivatives not designated as hedging instruments Location of Gain (Loss) recognized in Statement of Income on Derivatives Amount of Gain (Loss) recognized in Statement of Income on Derivatives Year ended December 31, 2015 2016 2017 Forward foreign exchange contracts (Note a) Foreign exchange gains (losses), net $ 6,566 $ 2,921 $ 16,696 $ 6,566 $ 2,921 $ 16,696 (a) These forward foreign exchange contracts were entered into to hedge fluctuations in foreign exchange rates for recognized balance sheet items, such as receivables and intercompany borrowings, and were not originally designated as hedges under FASB guidance on derivatives and hedging. Realized gains (losses) and changes in the fair value of these derivatives are recorded in foreign exchange gains (losses), net in the consolidated statements of income.

Prepaid expenses and other cu45

Prepaid expenses and other current assets (Tables)	12 Months Ended
	Dec. 31, 2017
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]
Prepaid Expenses and Other Current Assets	Prepaid expenses and other current assets consist of the following: As of December 31, 2016 2017 Advance income and non-income taxes $ 50,676 $ 51,832 Deferred transition costs 45,252 62,029 Derivative instruments 34,730 48,192 Prepaid expenses 22,222 16,944 Customer acquisition cost 11,126 19,327 Employee advances 6,880 5,014 Deposits 2,688 4,719 Advances to suppliers 10,059 2,705 Others 5,516 25,580 $ 189,149 $ 236,342

Property, plant and equipment46

Property, plant and equipment, net (Tables)	12 Months Ended
	Dec. 31, 2017
Property Plant And Equipment [Abstract]
Property, plant and equipment, net	Property, plant and equipment, net consist of the following: As of December 31, 2016 2017 Land $ 9,635 $ 10,209 Buildings 44,487 46,007 Furniture and fixtures 37,421 43,091 Computer equipment and servers 187,119 210,725 Plant, machinery and equipment 84,677 92,981 Computer software 119,648 137,459 Leasehold improvements 92,313 102,072 Vehicles 6,753 6,418 Capital work in progress 18,501 17,069 Property, plant and equipment, gross $ 600,554 $ 666,031 Less: accumulated depreciation, amortization and impairment (407,336 ) (459,001 ) Property, plant and equipment, net $ 193,218 $ 207,030

Goodwill and intangible assets

Goodwill and intangible assets (Tables)	12 Months Ended
	Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]
Changes in Goodwill	The following table presents the changes in goodwill for the years ended December 31, 2016 and 2017: As of December 31, 2016 2017 Opening balance $ 1,038,346 $ 1,069,408 Goodwill relating to acquisitions consummated during the period 51,535 229,745 Goodwill relating to divestitures during the period (2,226 ) — Impact of measurement period adjustments (59 ) (106 ) Effect of exchange rate fluctuations (18,188 ) 38,075 Closing balance $ 1,069,408 $ 1,337,122
Goodwill Allocated to Reporting Units	Goodwill has been allocated to the following reporting units, which represent different business units of the Company, as follows: As of December 31, 2016 2017 India $ 493,084 $ 735,596 China 58,139 60,171 Europe 36,584 41,775 Americas 48,713 57,021 IT services 432,888 442,559 $ 1,069,408 $ 1,337,122
Intangible Assets Acquired Either Individually or with Group of Other Assets or in Business Combination	The Company’s intangible assets acquired either individually or with a group of other assets or in a business combination are as follows: As of December 31, 2016 As of December 31, 2017 Gross carrying amount Accumulated amortization & Impairment Net Gross carrying amount Accumulated amortization & Impairment Net Customer-related intangible assets $ 312,041 $ 260,018 $ 52,023 $ 369,173 $ 293,029 $ 76,144 Marketing-related intangible assets 45,098 30,571 14,527 52,443 39,212 13,231 Technology-related intangible assets 26,116 21,026 5,090 54,189 28,278 25,911 Other intangible assets 2,875 2,466 409 3,081 2,314 767 Intangible assets under development 6,897 — 6,897 15,537 — 15,537 $ 393,027 $ 314,081 $ 78,946 $ 494,423 $ 362,833 $ 131,590
Estimated Amortization Schedule of Intangible Assets for Future Periods	10. Goodwill and intangible assets (Continued) The estimated amortization schedule for the Company’s intangible assets for future periods is set out below: For the year ending December 31: 2018 $ 38,569 2019 27,518 2020 26,831 2021 13,080 2022 and beyond 25,592 $ 131,590

Other assets (Tables)

Other assets (Tables)	12 Months Ended
	Dec. 31, 2017
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]
Other assets	Other assets consist of the following: As of December 31, 2016 2017 Customer acquisition cost $ 30,996 $ 37,017 Advance income and non-income taxes 60,203 63,474 Deferred transition costs 74,462 77,255 Deposits 29,853 32,174 Derivative instruments 20,657 24,906 Prepaid expenses 3,179 2,849 Accounts receivable due after one year 3,272 1,624 Others 19,706 22,870 $ 242,328 $ 262,169

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2017
Leases [Abstract]
Future Minimum Lease Payments under Operating Lease Arrangements	operating lease agreements that expire at various dates. Future minimum lease payments under these agreements are as follows As of December 31: 2018 $ 59,269 2019 54,844 2020 47,788 2021 43,692 2022 38,275 2023 and beyond 122,150 Total minimum lease payments $ 366,018

Accrued expenses and other cu50

Accrued expenses and other current liabilities (Tables)	12 Months Ended
	Dec. 31, 2017
Payables And Accruals [Abstract]
Accrued Expenses and Other Current Liabilities	Accrued expenses and other current liabilities consist of the following: As of December 31, 2016 2017 Accrued expenses $ 163,400 $ 204,997 Accrued employee cost 179,360 204,506 Deferred transition revenue 50,552 52,233 Statutory liabilities 36,878 36,283 Retirement benefits 17,616 21,074 Derivative instruments 4,777 10,346 Advance from customers 21,969 25,476 Earn-out consideration 6,885 14,928 Other liabilities 15,461 13,093 Capital lease obligations 1,349 1,546 $ 498,247 $ 584,482

Long-term debt (Tables)

Long-term debt (Tables)	12 Months Ended
	Dec. 31, 2017
Debt Disclosure [Abstract]
Maturity Profile of Term Loan, Net of Debt Amortization Expense	The maturity profile of the term loan, net of debt amortization expense, is as follows: Year ended Amount 2018 $ 39,226 2019 39,272 2020 619,654 Total $ 698,152

Other liabilities (Tables)

Other liabilities (Tables)	12 Months Ended
	Dec. 31, 2017
Other Liabilities Disclosure [Abstract]
Other liabilities	Other liabilities consist of the following: As of December 31, 2016 2017 Accrued employee cost $ 3,976 $ 14,020 Deferred transition revenue 72,560 70,900 Retirement benefits 39,020 40,520 Derivative instruments 12,576 7,842 Amount received from GE under indemnification arrangement, pending adjustment 3,159 3,359 Advance from customers 2,371 790 Earn-out consideration 15,550 9,804 Others 11,078 18,710 Capital lease obligations 2,500 2,664 $ 162,790 $ 168,609

Employee benefit plans (Tables)

Employee benefit plans (Tables)	12 Months Ended
	Dec. 31, 2017
Funded Status of Defined Benefit Plans and Amount Recognized	The following table sets forth the funded status of the Company’s defined benefit plans and the amounts recognized in the Company’s financial statements based on actuarial valuations carried out as of December 31, 2016 and 2017. As of December 31, 2016 2017 Change in benefit obligation Projected benefit obligation at the beginning of the year $ 35,617 $ 45,283 Service cost 5,661 7,735 Actuarial loss 6,749 4,493 Interest cost 2,585 3,252 Liabilities assumed on acquisition 693 Benefits paid (4,967 ) (5,367 ) Special termination benefit - 57 Effect of exchange rate changes (1,055 ) 2,641 Projected benefit obligation at the end of the year $ 45,283 $ 58,094 Change in fair value of plan assets Fair value of plan assets at the beginning of the year $ 28,549 $ 30,871 Employer contributions 5,776 15,176 Actual gain on plan assets 1,777 2,746 Assets assumed on acquisition 170 0 Actuarial gain — 11 Benefits paid (4,897 ) (5,301 ) Effect of exchange rate changes (504 ) 2,057 Fair value of plan assets at the end of the year $ 30,871 $ 45,560
Amounts Included in Other Comprehensive Income (Loss)	Amounts included in other comprehensive income (loss) as of December 31, 2016 and 2017 were as follows: As of December 31, 2016 2017 Net actuarial loss (8,979 ) (12,228 ) Deferred tax assets 2,759 2,221 Other comprehensive income, net (6,220 ) (10,007 )
Changes in Accumulated Other Comprehensive Income (Loss)	Changes in other comprehensive income (loss) during the year ended December 31, 2017 were as follows: 2017 Net actuarial loss $ (4,182 ) Amortization of net actuarial loss 1,177 Deferred income taxes (670 ) One-time cost 211 Effect of exchange rate changes (323 ) Other comprehensive income (loss), net $ (3,787 )
Net Defined Benefit Plan Costs	Net defined benefit plan costs for the years ended December 31, 2015, 2016 and 2017 include the following components: Year ended December 31, 2015 2016 2017 Service costs $ 5,578 $ 5,661 $ 7,735 Interest costs 2,629 2,585 3,252 Amortization of actuarial loss 330 (113 ) 1,177 Expected return on plan assets (2,154 ) (2,043 ) (2,412 ) One-time cost — — 209 Special termination benefits — — 426 Net defined benefit plan costs $ 6,383 $ 6,090 $ 10,387
Fair Values of Plan Assets	The fair values of the Company’s plan assets as of December 31, 2016 and 2017 by asset category are as follows: Total As of December 31, 2017 Fair Value Measurements at Reporting Date Using Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Other Unobservable Inputs Total (Level 1) (Level 2) (Level 3) Asset Category Cash $ 472 $ 472 $ — $ — Fixed income securities (Note a) 42,328 3,419 38,909 — Other securities (Note b) 2,760 2,437 323 — Total $ 45,560 $ 6,328 $ 39,232 $ — Total As of December 31, 2016 Fair Value Measurements at Reporting Date Using Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Other Unobservable Inputs Total (Level 1) (Level 2) (Level 3) Asset Category Cash $ 4,809 $ 4,809 $ — $ — Fixed income securities (Note a) 23,659 3,001 20,658 — Other securities (Note b) 2,403 2,191 212 — Total $ 30,871 $ 10,001 $ 20,870 $ — (a) Includes investments in funds that invest 100% of their assets in fixed income securities such as money market instruments, government securities and public and private bonds. (b) Includes investments in funds that invest primarily in fixed income securities and the remaining portion in equity securities.
Benefit Plan Payments Reflect Expected Future Service	The expected benefit plan payments set forth below reflect expected future service: Year ending December 31, 2018 $ 8,469 2019 8,823 2020 9,330 2021 9,946 2022 10,118 2023 - 2027 48,107 $ 94,793
Amount Contributed to Defined Contribution Plans in Various Jurisdictions	During the years ended December 31, 2015, 2016 and 2017, the Company contributed the following amounts to defined contribution plans in various jurisdictions: Year ended December 31, 2015 2016 2017 India $ 15,915 $ 19,074 $ 22,242 U.S. 8,148 10,379 11,147 U.K. 4,453 6,593 7,823 China 14,511 15,512 15,950 Other regions 4,690 4,684 4,059 Total $ 47,717 $ 56,242 $ 61,221
Benefit Obligations Of Gratuity Plan
Weighted Average Assumptions used to Determine Benefit Obligations and Plan Costs	The weighted average assumptions used to determine the benefit obligations of the Gratuity Plan as of December 31, 2016 and 2017 are presented below: As of December 31, 2016 2017 Discount rate 7.10% - 7.5% 7.40% - 7.60% Rate of increase in compensation per annum 5.20%-11.00% 5.20%-11.00%
Gratuity Plan Costs
Weighted Average Assumptions used to Determine Benefit Obligations and Plan Costs	The weighted average assumptions used to determine the Gratuity Plan costs for the years ended December 31, 2015, 2016 and 2017 are presented below: Year ended December 31, 2015 2016 2017 Discount rate 8.50% - 8.55% 8.30% - 8.45% 7.10% - 7.5% Rate of increase in compensation per annum 5.20% - 11.00% 5.20% - 11.00% 5.20% - 11.00% Expected long-term rate of return on plan assets per annum 8.50% 7.50% 7.50%
Benefit Obligations Of Mexican Plan
Weighted Average Assumptions used to Determine Benefit Obligations and Plan Costs	The weighted average assumptions used to determine the benefit obligations of the Mexican Plan as of December 31, 2016 and 2017 are presented below: Year ended December 31, 2016 2017 Discount rate 6.80 % 7.60 % Rate of increase in compensation per annum 5.50 % 5.50 %
Mexican Plan Costs
Weighted Average Assumptions used to Determine Benefit Obligations and Plan Costs	The weighted average assumptions used to determine the costs of the Mexican Plan for the years ended December 31, 2015, 2016 and 2017 are presented below: Year ended December 31, 2015 2016 2017 Discount rate 6.50 % 6.50 % 6.80 % Rate of increase in compensation per annum 5.50 % 5.50 % 5.50 % Expected long-term rate of return on plan assets per annum 0.00 % 0.00 % 0.00 %
Benefit Obligations Of Japan Plan
Weighted Average Assumptions used to Determine Benefit Obligations and Plan Costs	17. Employee benefit plans (Continued) The weighted average assumptions used to determine the benefit obligation of the Japan Plan as of December 31, 2016 and 2017 are presented below: Year ended December 31, 2016 2017 Discount rate 0.08% - 1.30% 0.113%-0.789% Rate of increase in compensation per annum 0.00% - 3.55% 0.00% - 3.55%
Japan Plan Costs
Weighted Average Assumptions used to Determine Benefit Obligations and Plan Costs	The weighted average assumptions used to determine the costs of the Japan Plan for the years ended December 31, 2015, 2016 and 2017 are presented below: Year ended December 31, 2015 2016 2017 Discount rate 0.20% - 1.30% 0.24% - 1.30% 0.08% - 1.30% Rate of increase in compensation per annum 0.00% - 3.55% 0.00% - 3.55% 0.00% - 3.55% Expected long-term rate of return on plan assets per annum 2.69% - 3.44% 0.00% - 3.77% 0.00% - 3.09%

Stock-based compensation (Table

Stock-based compensation (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Share-based Payment Award, Stock Options Granted, Valuation Assumptions	The following table shows the significant assumptions used in connection with the determination of the fair value of options granted in 2015, 2016 and 2017: 2015 2016 2017 Dividend yield — — 0.97% Expected life (in months) 84 84 84 Risk-free rate of interest for expected life 1.99% 1.42% - 1.56% 2.25 % Volatility 34.97% 25.60% - 27.22% 24.28%
Summary of Stock Option Activity	A summary of stock option activity during the years ended December 31, 2015, 2016 and 2017 is set out below: Year ended December 31, 2015 Shares arising out of options Weighted average exercise price Weighted average remaining contractual life (years) Aggregate intrinsic value Outstanding as of January 1, 2015 7,371,727 $ 15.44 5.9 $ — Granted 170,000 22.77 — — Forfeited (125,000 ) 19.35 — — Expired (1,277 ) 14.32 — — Exercised (1,428,605 ) 9.49 — 22,122 Outstanding as of December 31, 2015 5,986,845 $ 16.99 5.8 $ 48,661 Vested as of December 31, 2015 and expected to vest thereafter (Note a) 5,754,969 $ 16.76 5.8 $ 47,325 Vested and exercisable as of December 31, 2015 2,183,846 $ 12.67 2.7 $ 26,892 Weighted average grant-date fair value of options granted during the period $ 9.15 18. Stock-based compensation (Continued) Year ended December 31, 2016 Shares arising out of options Weighted average exercise price Weighted average remaining contractual life (years) Aggregate intrinsic value Outstanding as of January 1, 2016 5,986,845 $ 16.99 5.8 $ — Granted 860,000 26.80 — — Forfeited (145,000 ) 17.77 — — Expired — — — — Exercised (994,155 ) 14.98 — 9,301 Outstanding as of December 31, 2016 5,707,690 $ 18.65 5.8 $ 34,641 Vested as of December 31, 2016 and expected to vest thereafter (Note a) 5,457,701 $ 18.42 5.8 $ 34,150 Vested and exercisable as of December 31, 2016 2,746,191 $ 15.62 4.0 $ 23,960 Weighted average grant-date fair value of options granted during the period $ 8.50 Year ended December 31, 2017 Shares arising out of options Weighted average exercise price Weighted average remaining contractual life (years) Aggregate intrinsic value Outstanding as of January 1, 2017 5,707,690 $ 18.65 5.8 $ — Granted 250,000 24.74 — — Forfeited (80,000 ) 20.63 — — Expired — — — — Exercised (743,045 ) 14.50 — 12,636 Outstanding as of December 31, 2017 5,134,645 $ 19.52 5.6 $ 62,743 Vested as of December 31, 2017 and expected to vest thereafter (Note a) 4,988,875 $ 19.36 5.6 $ 61,779 Vested and exercisable as of December 31, 2017 2,203,146 $ 16.17 4.1 $ 34,303 Weighted average grant-date fair value of options granted during the period $ 6.62 (a) Options expected to vest reflect an estimated forfeiture rate.
Summary of Restricted Share Units Granted	A summary of RSUs granted during the years ended December 31, 2015, 2016 and 2017 is set out below: Year ended December 31, 2015 Number of Restricted Share Units Weighted Average Grant Date Fair Value Outstanding as of January 1, 2015 488,418 $ 15.36 Granted 53,546 20.88 Vested (Note b) (351,338 ) 15.29 Forfeited (33,236 ) 14.00 Outstanding as of December 31, 2015 157,390 $ 17.67 Expected to vest (Note a) 147,226 Year ended December 31, 2016 Number of Restricted Share Units Weighted Average Grant Date Fair Value Outstanding as of January 1, 2016 157,390 $ 17.67 Granted 95,553 25.49 Vested (Note c) (133,903 ) 20.66 Forfeited (1,135 ) 14.18 Outstanding as of December 31, 2016 117,905 $ 20.65 Expected to vest (Note a) 107,366 Year ended December 31, 2017 Number of Restricted Share Units Weighted Average Grant Date Fair Value Outstanding as of January 1, 2017 117,905 $ 20.65 Granted 1,533,836 26.36 Vested (Note d) (45,248 ) 18.31 Forfeited (1,242 ) 25.53 Outstanding as of December 31, 2017 1,605,251 $ 26.17 Expected to vest (Note a) 1,371,567 (a) RSUs expected to vest reflect an estimated forfeiture rate. (b) Vested RSUs were net settled by issuing 199,949 shares (net of minimum statutory tax withholding). 53,546 RSUs vested in the year ended December 31, 2015, 53,023 shares in respect of which were issued in 2017 after withholding shares to the extent of minimum statutory withholding taxes. (c) Vested RSUs were net settled by issuing 29,719 shares (net of minimum statutory tax withholding). 86,517 RSUs vested in the year ended December 31, 2016. 17,802 common shares underlying 34,035 of such RSUs were issued in 2017 after withholding shares to the extent of minimum statutory withholding taxes. Shares underlying the remaining 52,482 of such RSUs will be issued in 2018 after withholding shares to the extent of minimum statutory withholding taxes. (d) Vested RSUs were net settled by issuing 32,395 shares (net of minimum statutory tax withholding).
Summary of Performance Units Activity	A summary of PU activity during the years ended December 31, 2015, 2016 and 2017 is set out below: Year ended December 31, 2015 Number of Performance Units Weighted Average Grant Date Fair Value Maximum Shares Eligible to Receive Outstanding as of January 1, 2015 1,292,750 $ 16.78 2,648,626 Granted 1,375,650 22.72 2,965,475 Vested (Note b) (855 ) 16.78 (855 ) Forfeited (136,216 ) 17.82 (156,194 ) Adjustment due to achievement of lower-than-target performance (Note c) (32,007 ) 20.45 Adjustment due to achievement of lower-than-maximum performance (Note d) (2,957,730 ) Outstanding as of December 31, 2015 2,499,322 $ 19.95 2,499,322 Expected to vest (Note a) 2,184,906 18. Stock-based compensation (Continued) Year ended December 31, 2016 Number of Performance Units Weighted Average Grant Date Fair Value Maximum Shares Eligible to Receive Outstanding as of January 1, 2016 2,499,322 $ 19.95 2,499,322 Granted 1,518,374 27.93 3,343,335 Vested — — — Forfeited (252,842 ) 21.88 (325,817 ) Adjustment upon final determination of level of performance goal achievement (Note e) 7,274 22.72 Adjustment upon final determination of level of performance goal achievement (Note e) 7,274 Outstanding as of December 31, 2016 3,772,128 $ 23.04 5,524,114 Expected to vest (Note a) 2,226,489 Year ended December 31, 2017 Number of Performance Units Weighted Average Grant Date Fair Value Maximum Shares Eligible to Receive Outstanding as of January 1, 2017 3,772,128 $ 23.04 5,524,114 Granted 1,811,292 25.22 3,622,584 Vested (Note f) (1,136,047) 16.78 (1,136,047) Forfeited (Note g) (1,583,913 ) 27.57 (1,627,313 ) Adjustment upon final determination of level of performance goal achievement (Note h) 37,480 25.22 Adjustment upon final determination of level of performance goal achievement (Note i) (3,482,398) Outstanding as of December 31, 2017 2,900,940 $ 24.40 2,900,940 Expected to vest (Note a) 2,657,685 (a) PUs expected to vest are based on the probable achievement of the performance targets after considering an estimated forfeiture rate. (b) Vested PUs were net settled upon vesting by issuing 590 shares (net of minimum statutory tax withholding). 18. Stock-based compensation (Continued) (c) Represents a 5.2% to 6.7% reduction, depending on the targets under the PU award granted, in the number of target shares as a result of achievement of lower-than-target performance for the PUs granted in 2015, partially offset by a 0.8% to 6.6% increase in the number of target shares as a result of achievement of higher-than-target performance for the PUs granted in 2014. (d) Represents the difference between the maximum number of shares achievable and the number of shares expected to vest under the PU awards granted in 2015. Also includes the difference between the maximum number of shares achievable and the number of shares eligible to vest under the PU awards granted in 2014 based on the certified level of achievement of the performance goals. (e) Represents an adjustment made in March 2016 to the number of shares underlying the PUs granted in 2015 upon certification of the level of achievement of the performance targets for such awards. (f) Vested PUs were net settled upon vesting by issuing 731,701 shares (net of minimum statutory tax withholding). (g) Includes 1,443,624 target shares underlying PUs granted in 2016 which were forfeited for failure to achieve all of the threshold performance targets under such awards as certified by the compensation committee based on the Company’s audited financial statements for the year ended December 31, 2016. (h) Represents a 2.7% increase in the number of target shares as a result of achievement of higher-than-target performance for certain PUs granted in 2017, partially offset by a 12.5% reduction as a result of achievement of lower-than-target performance for certain PUs granted in 2017. (i) Represents the difference between the maximum number of shares achievable and the number of shares expected to vest under the PU awards granted in 2017 based on the level of achievement of the performance goals. Also includes the difference between the maximum number of shares achievable and the number of shares eligible to vest under the PU awards granted in 2016, which were forfeited for failure to achieve all of the threshold performance targets under such awards as certified by the compensation committee based on the Company’s audited financial statements for the year ended December 31, 2016.

Earnings per share (Tables)

Earnings per share (Tables)	12 Months Ended
	Dec. 31, 2017
Earnings Per Share [Abstract]
Earnings Per share	Year ended December 31, 2015 2016 2017 Net income available to Genpact Limited common shareholders $ 239,817 $ 269,684 $ 263,111 Weighted average number of common shares used in computing basic earnings per common share 216,606,542 206,861,536 193,864,755 Dilutive effect of stock-based awards 2,538,502 3,264,487 3,184,797 Weighted average number of common shares used in computing dilutive earnings per common share 219,145,044 210,126,023 197,049,552 Earnings per common share attributable to Genpact Limited common shareholders Basic $ 1.11 $ 1.30 $ 1.36 Diluted $ 1.09 $ 1.28 $ 1.34

Cost of revenue (Tables)

Cost of revenue (Tables)	12 Months Ended
	Dec. 31, 2017
Other Income And Expenses [Abstract]
Cost of revenue	Cost of revenue consists of the following: Year ended December 31, 2015 2016 2017 Personnel expenses $ 1,013,209 $ 1,061,501 $ 1,155,745 Operational expenses 432,535 446,922 481,012 Depreciation and amortization 47,803 46,284 46,947 $ 1,493,547 $ 1,554,707 $ 1,683,704

Selling, general and administ57

Selling, general and administrative expenses (Tables)	12 Months Ended
	Dec. 31, 2017
Selling General And Administrative Expenses [Abstract]
Selling, General and Administrative Expenses	Selling, general and administrative expenses consist of the following: Year ended December 31, 2015 2016 2017 Personnel expenses $ 430,088 $ 469,956 $ 501,445 Operational expenses 169,042 174,060 178,573 Depreciation and amortization 8,984 9,013 9,829 $ 608,114 $ 653,029 $ 689,847

Other operating (income) expe58

Other operating (income) expense, net (Tables)	12 Months Ended
	Dec. 31, 2017
Other Income And Expenses [Abstract]
Other Operating (Income) Expense, Net	Year ended December 31, 2015 2016 2017 Other operating (income) expense $ (2,515 ) $ (1,266 ) $ (7,277 ) Provision for impairment of intangible assets and property, plant and equipment 10,714 11,195 9,311 Change in fair value of earn-out consideration and deferred consideration (relating to business acquisitions) (11,521 ) (14,869 ) (3,695 ) Other operating (income) expense, net $ (3,322 ) $ (4,940 ) $ (1,661 )

Interest income (expense), net

Interest income (expense), net (Tables)	12 Months Ended
	Dec. 31, 2017
Banking And Thrift Interest [Abstract]
Interest Income (Expense), Net	Interest income (expense), net consists of the following: Year ended December 31, 2015 2016 2017 Interest income $ 8,676 $ 7,247 $ 8,182 Interest expense (29,828 ) (23,431 ) (39,917 ) Loss on extinguishment of debt (10,115 ) - - Interest income (expense), net $ (31,267 ) $ (16,184 ) $ (31,735 )

Income taxes (Tables)

Income taxes (Tables)	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income Tax Expense (Benefit)	Income tax expense (benefit) for the years ended December 31, 2015, 2016 and 2017 is allocated as follows: Year ended December 31, 2015 2016 2017 Income from continuing operations $ 61,937 $ 62,098 $ 59,742 Other comprehensive Income: Unrealized gains (losses) on cash flow hedges 13,816 23,809 457 Retirement benefits 1,304 (1,885 ) 670 Additional paid in capital: Excess tax benefit on stock-based compensation (6,560 ) — — Retained earnings: Deferred tax assets recognized on early adoption of ASU 2016-09 — (24,912 ) —
Components of Income before Income Tax Expense from Continuing Operations	The components of income before income tax expense from continuing operations are as follows: Year ended December 31, 2015 2016 2017 Domestic (U.S.) $ 23,122 $ 44,110 $ 8,440 Foreign (Non-U.S.) 278,632 285,535 312,143 Income before income taxes $ 301,754 $ 329,645 $ 320,583
Income Tax Expense (Benefit) Attributable to Income from Continuing Operations	Income tax expense (benefit) attributable to income from continuing operations consists of: Year ended December 31, 2015 2016 2017 Current taxes: Domestic (U.S. federal taxes) $ 12,142 $ 78 $ 3,380 Domestic (U.S. state taxes) 301 1,069 1,268 Foreign (Non-U.S.) 68,207 30,497 65,485 $ 80,650 $ 31,644 $ 70,133 Deferred taxes: Domestic (U.S. federal taxes) $ (5,396 ) $ 11,379 $ 3,549 Domestic (U.S. state taxes) 344 (459 ) (2,809 ) Foreign (Non-U.S.) (13,661 ) 19,534 (11,131 ) $ (18,713 ) $ 30,454 $ (10,391 ) Total income tax expense (benefit) $ 61,937 $ 62,098 $ 59,742
Income Tax Expense (Benefit) Computed by Applying United States Federal Statutory Income Tax Rate to Income Before Income Taxes	Income tax expense (benefit) attributable to income from continuing operations differed from the amounts computed by applying the U.S. federal statutory income tax rate of 35% to income before income taxes, as a result of the following: Year ended December 31, 2015 2016 2017 Income before income tax expense $ 301,754 $ 329,645 $ 320,583 Statutory tax rates 35 % 35 % 35 % Computed expected income tax expense 105,614 115,376 112,204 Increase (decrease) in income taxes resulting from: Foreign tax rate differential (16,550 ) (18,574 ) (25,224 ) Tax benefit from tax holiday (38,039 ) (32,893 ) (35,814 ) Non-deductible expenses 1,884 2,295 1,146 Effect of change in tax rates 1,436 353 2,778 Change in valuation allowance (33 ) (4,830 ) 9,041 Unrecognized tax benefits 6,272 (627 ) 1,611 Other* 1,353 998 (6,000 ) Reported income tax expense (benefit) $ 61,937 $ 62,098 $ 59,742 *During 2017, following the transfer/closure of certain affiliated entities, deferred tax liabilities recorded against the outside basis difference amounting to $9,600 were reversed. It was not more likely than not that the resulting net deferred tax asset would be realized. Therefore, a full valuation allowance was established to offset the reduction in deferred tax liabilities.
Components of Deferred Tax Balances	The components of the Company’s deferred tax balances as of December 31, 2016 and 2017 are as follows: As of December 31, 2016 2017 Deferred tax assets Net operating loss carryforwards $ 52,997 $ 55,500 Accrued liabilities and other expenses 19,840 41,177 Provision for doubtful debts 6,419 10,509 Property, plant and equipment 3,445 1,270 Unrealized losses on cash flow hedges, Net 558 275 Share-based compensation 19,054 19,789 Retirement benefits 5,067 5,817 Deferred revenue 44,892 22,948 Tax credit carryforwards 34,509 35,322 Other 8,876 11,571 Gross deferred tax assets $ 195,657 $ 204,178 Less: valuation allowance (14,746 ) (24,549 ) Total deferred tax assets $ 180,911 $ 179,629 Deferred tax liabilities Intangible assets $ 13,519 $ 15,954 Property, plant and equipment 2,745 1,131 Deferred cost 41,950 33,816 Investments in foreign subsidiaries not indefinitely reinvested 29,546 18,949 Unrealized gains on cash flow hedges, net 14,350 14,711 Other 11,073 24,886 Total deferred tax liabilities $ 113,183 $ 109,447 Net deferred tax asset $ 67,728 $ 70,182 As of December 31, Classified as 2016 2017 Deferred tax assets Non-current $ 70,143 $ 76,929 Deferred tax liabilities Non-current 2,415 6,747 $ 67,728 $ 70,182
Change in Total Valuation Allowance for Deferred Tax Assets	The change in the total valuation allowance for deferred tax assets as of December 31, 2015, 2016 and 2017 is as follows: Year ended December 31, 2015 2016 2017 Opening valuation allowance $ 21,094 $ 20,091 $ 14,746 Reduction during the year (3,499 ) (7,299 ) (3,957 ) Addition during the year 2,496 1,954 13,760 Closing valuation allowance $ 20,091 $ 14,746 $ 24,549
Remaining Tax Loss Carry Forwards Expiration	The Company’s remaining tax loss carryforwards expire as set forth in the table below: US – Federal Europe Others Year ending December 31, 2018 $ — $ — $ 20 2019 — — 72 2020 — 1,872 62 2021 — 581 2,084 2022 — 5,253 60 2023 — 8,500 953 2024 — 1,213 7,941 2025 — 28,222 9,647 2026 9,511 2,263 3,072 2027 9,913 — 2,053 2028 — 33 2,451 2034 — — 1,027 $ 19,424 $ 47,937 $ 29,442
Foreign Tax Credit Expiry Period	As of December 31, 2017, the company had a total foreign tax credit carryforward of $33,220, which will expire as set forth in the table below: Year ending December 31, Amount 2023 $ 893 2024 1,202 2025 15,552 2026 8,481 2027 5,362 2028 1,730 $ 33,220
Activities Related to Unrecognized Tax Benefits	25. Income taxes (Continued) The following table summarizes activities related to our unrecognized tax benefits from January 1 to December 31 for each of 2015, 2016 and 2017: Year Ended December 31, 2015 2016 2017 Opening balance at January 1 $ 22,718 $ 26,357 $ 23,467 Increase related to prior year tax positions, including recorded in acquisition accounting 2,000 370 2,582 Decrease related to prior year tax positions — (1,506 ) (1,398 ) Decrease related to divestiture of business — (345 ) — Decrease related to prior year tax position due to lapse of applicable statute of limitation (820 ) (2,122 ) (1,019 ) Increase related to current year tax positions, including recorded in acquisition accounting 3,544 3,225 1,661 Decrease related to settlements with tax Authorities — (2,000 ) — Effect of exchange rate changes (1,085 ) (512 ) 767 Closing balance at December 31 $ 26,357 $ 23,467 $ 26,060

Segment reporting (Tables)

Segment reporting (Tables)	12 Months Ended
	Dec. 31, 2017
Segment Reporting [Abstract]
Net Revenues for Service Type	Net revenues by service type are as follows: Year ended December 31, 2015 2016 2017 Business process outsourcing $ 1,933,095 $ 2,083,450 $ 2,264,335 Information technology services 527,949 487,306 472,594 Total net revenues $ 2,461,044 $ 2,570,756 $ 2,736,929
Revenues from Clients Based on Industry Serviced	Revenues from clients based on the industry serviced are as follows: Year ended December 31, 2015 2016 2017 Banking, financial services and insurance $ 1,030,584 $ 1,055,704 $ 1,105,731 Manufacturing, including pharmaceuticals and medical equipment manufacturing 878,570 958,779 1,002,973 Technology, healthcare and other services 551,890 556,273 628,225 Total net revenues $ 2,461,044 $ 2,570,756 $ 2,736,929
Net Revenues from Geographic Areas Based on Location of Service Delivery Centers	Net revenues from geographic areas based on the location of the Company’s service delivery centers are as follows. A portion of net revenues attributable to India consists of net revenues for services performed by delivery centers in India or at clients’ premises outside of India by business units or personnel normally based in India. Year ended December 31, 2015 2016 2017 India $ 1,687,699 $ 1,804,113 $ 1,712,783 Asia, other than India 238,529 249,839 286,338 North and Latin America 304,879 282,434 455,059 Europe 229,937 234,370 282,749 Total net revenues $ 2,461,044 $ 2,570,756 $ 2,736,929
Property, Plant and Equipment, Net by Geographic Areas	26. Segment reporting (Continued) Property, plant and equipment, net by geographic region are as follows: As of December 31, 2016 2017 India $ 116,417 $ 125,490 Asia, other than India 13,549 15,899 North and Latin America 44,633 38,438 Europe 18,619 27,203 Total $ 193,218 $ 207,030

Quarterly financial data (una62

Quarterly financial data (unaudited) (Tables)	12 Months Ended
	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Data	Three months ended Year ended March 31, 2017 June 30, 2017 September 30, 2017 December 31, 2017 December 31, 2017 Total net revenues $ 622,995 $ 670,697 $ 708,824 $ 734,413 $ 2,736,929 Gross profit $ 239,658 $ 255,404 $ 279,633 $ 278,530 $ 1,053,225 Income from operations $ 79,096 $ 80,031 $ 97,451 $ 72,049 $ 328,627 Income before equity method investment activity, net and income tax expense $ 69,243 $ 84,582 $ 89,742 $ 81,559 $ 325,126 Net Income $ 52,440 $ 69,102 $ 73,161 $ 66,138 $ 260,841 Net (income) loss attributable to redeemable non-controlling interest $ 898 $ (156 ) $ 584 $ 944 $ 2,270 Net income attributable to Genpact Limited common shareholders $ 53,338 $ 68,946 $ 73,745 $ 67,082 $ 263,111 Earnings per common share attributable to Genpact Limited common shareholders Basic $ 0.27 $ 0.36 $ 0.38 $ 0.35 $ 1.36 Diluted $ 0.26 $ 0.36 $ 0.38 $ 0.34 $ 1.34 Weighted average number of common shares used in computing earnings per common share attributable to Genpact Limited common shareholders Basic 199,069,528 191,469,593 192,124,366 192,795,534 193,864,755 Diluted 202,655,937 193,732,406 194,947,699 196,862,168 197,049,552 29. Quarterly financial data (unaudited) (Continued) Three months ended Year ended March 31, 2016 June 30, 2016 September 30, 2016 December 31, 2016 December 31, 2016 Total net revenues $ 609,703 $ 630,523 $ 648,783 $ 681,747 $ 2,570,756 Gross profit $ 236,855 $ 246,768 $ 256,351 $ 276,075 $ 1,016,049 Income from operations $ 75,622 $ 79,940 $ 87,124 $ 98,092 $ 340,777 Income before equity method investment activity, net and income tax expense $ 72,664 $ 81,818 $ 87,360 $ 95,502 $ 337,343 Net income $ 58,505 $ 64,788 $ 68,188 $ 76,066 $ 267,547 Net (income) loss attributable to redeemable non-controlling interest $ 289 $ 882 $ 734 $ 232 $ 2,137 Net income attributable to Genpact Limited common shareholders $ 58,794 $ 65,670 $ 68,922 $ 76,298 $ 269,684 Earnings per common share attributable to Genpact Limited common shareholders Basic $ 0.28 $ 0.31 $ 0.33 $ 0.38 $ 1.30 Diluted $ 0.27 $ 0.31 $ 0.33 $ 0.38 $ 1.28 Weighted average number of common shares used in computing earnings per common share attributable to Genpact Limited common shareholders Basic 210,780,165 210,178,050 206,146,007 200,341,922 206,861,536 Diluted 213,892,964 213,803,134 209,376,683 203,431,310 210,126,023

Organization - Additional Infor

Organization - Additional Information (Detail)	Dec. 31, 2017EmployeeCountry
Accounting Policies [Abstract]
Number of employees around the globe, minimum | Employee	78,000
Number of countries in which entity operates | Country	20

Summary of Significant Accoun64

Summary of Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
General Electric Company
Schedule Of Significant Accounting Policies [Line Items]
Percentage of accounts receivables	11.00%	15.00%
Percentage of revenues	10.00%	14.00%	19.00%
Minimum
Schedule Of Significant Accounting Policies [Line Items]
Short term investment, maturity period	90 days
Maximum
Schedule Of Significant Accounting Policies [Line Items]
Short term investment, maturity period	1 year

Estimated Economic Useful Lives

Estimated Economic Useful Lives of Assets (Detail)	12 Months Ended
	Dec. 31, 2017
Buildings
Property Plant And Equipment [Line Items]
Property, plant and equipment, estimated useful lives	40 years
Furniture and Fixtures
Property Plant And Equipment [Line Items]
Property, plant and equipment, estimated useful lives	4 years
Computer Equipment and Servers
Property Plant And Equipment [Line Items]
Property, plant and equipment, estimated useful lives	4 years
Plant, Machinery and Equipment
Property Plant And Equipment [Line Items]
Property, plant and equipment, estimated useful lives	4 years
Computer software | Minimum
Property Plant And Equipment [Line Items]
Property, plant and equipment, estimated useful lives	4 years
Computer software | Maximum
Property Plant And Equipment [Line Items]
Property, plant and equipment, estimated useful lives	7 years
Leasehold Improvements
Property Plant And Equipment [Line Items]
Property, plant and equipment, estimated useful lives	10 years
Property, plant and equipment, estimated useful lives description	Lesser of lease period or 10 Years
Vehicles | Minimum
Property Plant And Equipment [Line Items]
Property, plant and equipment, estimated useful lives	3 years
Vehicles | Maximum
Property Plant And Equipment [Line Items]
Property, plant and equipment, estimated useful lives	4 years

Estimated Useful Lives of Intan

Estimated Useful Lives of Intangible Assets Acquired/Developed (Detail)	12 Months Ended
	Dec. 31, 2017
Customer-Related Intangible Assets | Maximum
Acquired Finite Lived Intangible Assets [Line Items]
Intangible assets estimated useful lives	14 years
Customer-Related Intangible Assets | Minimum
Acquired Finite Lived Intangible Assets [Line Items]
Intangible assets estimated useful lives	1 year
Marketing-Related Intangible Assets | Maximum
Acquired Finite Lived Intangible Assets [Line Items]
Intangible assets estimated useful lives	10 years
Marketing-Related Intangible Assets | Minimum
Acquired Finite Lived Intangible Assets [Line Items]
Intangible assets estimated useful lives	1 year
Technology-related intangible assets | Maximum
Acquired Finite Lived Intangible Assets [Line Items]
Intangible assets estimated useful lives	8 years
Technology-related intangible assets | Minimum
Acquired Finite Lived Intangible Assets [Line Items]
Intangible assets estimated useful lives	2 years
Other Intangible Assets | Maximum
Acquired Finite Lived Intangible Assets [Line Items]
Intangible assets estimated useful lives	5 years
Other Intangible Assets | Minimum
Acquired Finite Lived Intangible Assets [Line Items]
Intangible assets estimated useful lives	3 years

Business Acquisitions - TandemS

Business Acquisitions - TandemSeven, Inc. - Additional Information (Detail) - USD ($) $ in Thousands	Sep. 05, 2017	Jan. 08, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Payment for business acquisitions, net of cash acquired			$ 284,822	$ 45,162	$ 21,363
Goodwill			$ 1,337,122	$ 1,069,408	$ 1,038,346
Acquisition related cost		$ 164
Acquired assets		412
Liabilities assumed		$ 617
TandemSeven, Inc.
Business Acquisition [Line Items]
Date of acquisition	Sep. 5, 2017
Ownership percentage acquired	100.00%
Business combination estimated purchase consideration	$ 35,720
Payment for business acquisitions, net of cash acquired	31,866
Cash and cash equivalents	$ 3,854
Maximum measurement period for tax position evaluation	1 year
Acquired intangible assets, weighted average amortization period	2 years
Goodwill	$ 25,298
Acquisition related cost	932
Acquired assets	7,388
Liabilities assumed	1,206
Recognized net deferred tax asset	260
TandemSeven, Inc. | Customer-Related Intangible Assets
Business Acquisition [Line Items]
Intangible assets	2,000
TandemSeven, Inc. | Marketing-Related Intangible Assets
Business Acquisition [Line Items]
Intangible assets	1,700
TandemSeven, Inc. | Technology-related intangible assets
Business Acquisition [Line Items]
Intangible assets	$ 800

Business Acquisitions - BrightC

Business Acquisitions - BrightClaim LLC and Associated Companies - Additional Information (Detail) - USD ($) $ in Thousands	May 03, 2017	Jan. 08, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Payment for business acquisitions, net of cash acquired			$ 284,822	$ 45,162	$ 21,363
Goodwill			1,337,122	$ 1,069,408	$ 1,038,346
Acquisition related cost		$ 164
Acquired assets		412
Liabilities assumed		$ 617
Bright Claim LLC And Associated Companies
Business Acquisition [Line Items]
Date of acquisition	May 3, 2017
Ownership percentage acquired	100.00%
Payment for business acquisitions, net of cash acquired	$ 52,395
Cash and cash equivalents	4,002
Purchase consideration	$ 56,461		56,496
Business combination change in contingent consideration receivable			$ 35
Acquired intangible assets, weighted average amortization period	4 years
Goodwill	$ 42,638
Acquisition related cost	1,563
Acquired assets	10,367
Liabilities assumed	7,415
Recognized net deferred tax asset	2,728
Bright Claim LLC And Associated Companies | Customer-Related Intangible Assets
Business Acquisition [Line Items]
Intangible assets	8,000
Bright Claim LLC And Associated Companies | Marketing-Related Intangible Assets
Business Acquisition [Line Items]
Intangible assets	3,200
Bright Claim LLC And Associated Companies | Technology-related intangible assets
Business Acquisition [Line Items]
Intangible assets	2,200
Bright Claim LLC And Associated Companies | Other Intangible Assets
Business Acquisition [Line Items]
Intangible assets	$ 200

Business Acquisitions - RAGE Fr

Business Acquisitions - RAGE Frameworks, Inc. - Additional Information (Detail) - USD ($) $ in Thousands	Apr. 13, 2017	Jan. 08, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Payment for business acquisitions, net of cash acquired			$ 284,822	$ 45,162	$ 21,363
Goodwill			$ 1,337,122	$ 1,069,408	$ 1,038,346
Acquisition related cost		$ 164
Acquired assets		412
Liabilities assumed		$ 617
Rage Frameworks Inc
Business Acquisition [Line Items]
Date of acquisition	Apr. 13, 2017
Ownership percentage acquired	100.00%
Business combination estimated purchase consideration	$ 125,089
Payment for business acquisitions, net of cash acquired	124,149
Cash and cash equivalents	$ 1,605
Acquired intangible assets, weighted average amortization period	7 years
Goodwill	$ 105,114
Acquisition related cost	881
Acquired assets	13,836
Liabilities assumed	9,654
Recognized net deferred tax asset	1,094
Rage Frameworks Inc | Customer-Related Intangible Assets
Business Acquisition [Line Items]
Intangible assets	1,600
Rage Frameworks Inc | Marketing-Related Intangible Assets
Business Acquisition [Line Items]
Intangible assets	600
Rage Frameworks Inc | Technology-related intangible assets
Business Acquisition [Line Items]
Intangible assets	12,400
Rage Frameworks Inc | Other Intangible Assets
Business Acquisition [Line Items]
Intangible assets	$ 100

Business Acquisitions - Other A

Business Acquisitions - Other Acquisitions in 2017 - Additional Information (Detail) - USD ($) $ in Thousands	Jan. 08, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Payment for business acquisitions, net of cash acquired		$ 284,822	$ 45,162	$ 21,363
Goodwill		1,337,122	$ 1,069,408	$ 1,038,346
Acquisition related cost	$ 164
Acquired assets	412
Liabilities assumed	$ 617
Other Acquisitions
Business Acquisition [Line Items]
Business combination estimated purchase consideration		87,586
Payment for business acquisitions, net of cash acquired		76,612
Cash and cash equivalents		$ 254
Acquired intangible assets, weighted average amortization period		5 years
Goodwill		$ 56,521
Acquisition related cost		2,369
Acquired assets		10,387
Liabilities assumed		11,239
Recognized net deferred tax asset		6,570
Other Acquisitions | Customer-Related Intangible Assets
Business Acquisition [Line Items]
Intangible assets		33,494
Other Acquisitions | Marketing-Related Intangible Assets
Business Acquisition [Line Items]
Intangible assets		1,936
Other Acquisitions | Technology-related intangible assets
Business Acquisition [Line Items]
Intangible assets		2,956
Other Acquisitions | Other Intangible Assets
Business Acquisition [Line Items]
Intangible assets		100
Kraft Foods Group Brands LLC
Business Acquisition [Line Items]
Contingent earn-out consideration-Low end		0
Contingent earn-out consideration-High end		10,000
LeaseDimensions Inc.
Business Acquisition [Line Items]
Contingent earn-out consideration-Low end		0
Contingent earn-out consideration-High end		$ 3,000

Business Acquisitions - Summary

Business Acquisitions - Summary of Acquisition Date, Goodwill Reporting Unit and Tax Deductibility of Goodwill of Each Acquisition (Detail)	12 Months Ended
	Dec. 31, 2017
Kraft Foods Group Brands LLC
Business Acquisition [Line Items]
Acquisition date	Oct. 16, 2017
Goodwill reporting unit	India
Tax deductibility of goodwill	Deductible
Onsource L L C
Business Acquisition [Line Items]
Acquisition date	Jul. 18, 2017
Goodwill reporting unit	India
Tax deductibility of goodwill	Deductible
I T Business Of Birlasoft
Business Acquisition [Line Items]
Acquisition date	Jul. 18, 2017
Goodwill reporting unit	IT Services
Tax deductibility of goodwill	Deductible
Image Processing Business Of Fiserv Solutions Of Australia Pty Ltd
Business Acquisition [Line Items]
Acquisition date	May 11, 2017
Goodwill reporting unit	India
Tax deductibility of goodwill	Non-deductible
LeaseDimensions Inc.
Business Acquisition [Line Items]
Acquisition date	Feb. 15, 2017
Goodwill reporting unit	Americas
Tax deductibility of goodwill	Non-deductible

Business Acquisitions - Endeavo

Business Acquisitions - Endeavour Software Technologies Private Limited - Additional Information (Detail) - USD ($) $ in Thousands	Apr. 13, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jan. 08, 2016
Business Acquisition [Line Items]
Payment for business acquisitions, net of cash acquired		$ 284,822	$ 45,162	$ 21,363
Goodwill		$ 1,337,122	$ 1,069,408	$ 1,038,346
Acquired assets					$ 412
Liabilities assumed					$ 617
Endeavour Software Technologies Private Limited
Business Acquisition [Line Items]
Date of acquisition	Apr. 13, 2016
Ownership percentage acquired	100.00%
Purchase consideration	$ 14,788
Payment for business acquisitions, net of cash acquired	10,345
Cash and cash equivalents	2,373
Contingent earn-out consideration-Low end	0
Contingent earn-out consideration-High end	$ 3,500
Acquired intangible assets, weighted average amortization period	3 years
Goodwill	$ 8,936
Acquired assets	5,854
Liabilities assumed	1,735
Endeavour Software Technologies Private Limited | Customer-Related Intangible Assets
Business Acquisition [Line Items]
Intangible assets	800
Endeavour Software Technologies Private Limited | Marketing-Related Intangible Assets
Business Acquisition [Line Items]
Intangible assets	900
Endeavour Software Technologies Private Limited | Other Intangible Assets
Business Acquisition [Line Items]
Intangible assets	$ 950

Business Acquisitions - Strateg

Business Acquisitions - Strategic Sourcing Excellence Limited - Additional Information (Detail) - USD ($)	Jan. 08, 2016	Apr. 30, 2018	Jan. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Acquisition related cost	$ 164,000
Acquired assets	412,000
Liabilities assumed	$ 617,000
Goodwill				$ 1,337,122,000	$ 1,069,408,000	$ 1,038,346,000
Strategic Sourcing Excellence LLC
Business Acquisition [Line Items]
Date of acquisition	Jan. 8, 2016
Ownership percentage acquired	51.00%
Preliminary estimated purchase consideration	$ 14,541,000
Cash consideration to acquired certain assets and assumed certain liabilities	2,550,000
Contingent earn-out consideration-High end	$ 20,000,000
Equity method investment ownership percentage	49.00%
Goodwill	$ 14,445,000
Strategic Sourcing Excellence LLC | Customer Relationships
Business Acquisition [Line Items]
Intangible assets	$ 300,000
Acquired intangible assets, weighted average amortization period	5 years
Put Or Call Option | Strategic Sourcing Excellence LLC
Business Acquisition [Line Items]
Contingent earn-out consideration-High end	$ 9,800,000
Call Option | Strategic Sourcing Excellence LLC | Subsequent Event
Business Acquisition [Line Items]
Equity method investment ownership percentage			49.00%
Put Option | Strategic Sourcing Excellence LLC | Scenario, Forecast
Business Acquisition [Line Items]
Equity method investment ownership percentage		49.00%
Put Option | Strategic Sourcing Excellence LLC | Minimum | Scenario, Forecast
Business Acquisition [Line Items]
Selling equity holders put option exercise price		$ 2,450,000
Put Option | Strategic Sourcing Excellence LLC | Maximum | Scenario, Forecast
Business Acquisition [Line Items]
Selling equity holders put option exercise price		$ 2,950,000

Business Acquisitions - PNMSoft

Business Acquisitions - PNMSoft Ltd. - Additional Information (Detail) - USD ($) $ in Thousands	Aug. 04, 2016	Jan. 08, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Payment for business acquisitions, net of cash acquired			$ 284,822	$ 45,162	$ 21,363
Goodwill			$ 1,337,122	$ 1,069,408	$ 1,038,346
Acquisition related cost		$ 164
Acquired assets		412
Liabilities assumed		$ 617
PNMSoft Ltd
Business Acquisition [Line Items]
Date of acquisition	Aug. 4, 2016
Percentage of equity interest acquired	100.00%
Purchase consideration	$ 35,341
Payment for business acquisitions, net of cash acquired	28,128
Cash and cash equivalents	2,853
Contingent earn-out consideration-Low end	0
Contingent earn-out consideration-High end	$ 9,000
Acquired intangible assets, weighted average amortization period	2 years
Goodwill	$ 25,101
Acquisition related cost	1,273
Acquired assets	7,110
Liabilities assumed	4,366
Recognized net deferred tax liability	944
PNMSoft Ltd | Customer-Related Intangible Assets
Business Acquisition [Line Items]
Intangible assets	1,700
PNMSoft Ltd | Marketing-Related Intangible Assets
Business Acquisition [Line Items]
Intangible assets	1,630
PNMSoft Ltd | Other Intangible Assets
Business Acquisition [Line Items]
Intangible assets	$ 5,110

Business Acquisitions - IT Supp

Business Acquisitions - IT Support Business - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Nov. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Gain (loss) on divestiture		$ (5,668)	$ 5,214
IT Support Business | Europe
Business Acquisition [Line Items]
Sale proceeds	$ 0
Net revenues		4,546
Net profit (loss)		$ (9,706)
Gain (loss) on divestiture	$ (5,668)

Summary of Calculation of Gain

Summary of Calculation of Gain (Loss) on Sale of Business (Detail) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended	12 Months Ended
	Nov. 30, 2017	Sep. 30, 2016	Dec. 31, 2017	Dec. 31, 2016
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Net sale proceeds			$ (4,738)	$ 17,242
(Loss) Gain on divestiture included in other income (expense), net			$ (5,668)	$ 5,214
IT Support Business | Europe
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Net assets of the business, including intangible assets, allocated goodwill and the translation impact thereof	$ 5,569
Selling expenses	99
(Loss) Gain on divestiture included in other income (expense), net	$ (5,668)
Atyati Technologies Private Limited
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Net sale proceeds		$ 17,155
Net assets of the business, including intangible assets, allocated goodwill and the translation impact thereof		11,941
Selling expenses		427
(Loss) Gain on divestiture included in other income (expense), net		$ 5,214

Business Acquisitions - Atyati

Business Acquisitions - Atyati Technologies Private Limited - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Proceeds from divestiture of business, net of cash divested		$ (4,738)	$ 17,242
Gain (loss) on divestiture		$ (5,668)	5,214
Atyati Technologies Private Limited
Business Acquisition [Line Items]
Proceeds from divestiture of business, net of cash divested	$ 17,155
Net of selling expenses	427
Cash divested	854
Net revenues			14,958
Net profit (loss)			$ 64
Gain (loss) on divestiture	$ 5,214

Cash and Cash Equivalents (Deta

Cash and Cash Equivalents (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash And Cash Equivalents [Abstract]
Cash and other bank balances	$ 504,468	$ 422,623
Total	$ 504,468	$ 422,623	$ 450,907	$ 461,788

Reserve for Doubtful Receivable

Reserve for Doubtful Receivables (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Receivables [Abstract]
Opening Balance	$ 15,519	$ 11,530	$ 15,192
Additions due to acquisitions	235
Additions charged to cost and expense	9,819	7,282	2,449
Deductions/effect of exchange rate fluctuations	(1,913)	(3,293)	(6,111)
Closing balance	$ 23,660	$ 15,519	$ 11,530

Accounts Receivable, Net of R80

Accounts Receivable, Net of Reserve for Doubtful Receivables - Additional Information (Detail) - USD ($)	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Receivables [Abstract]
Gross accounts receivable	$ 716,745,000	$ 630,784,000
Reserve for doubtful receivables	23,660,000	15,519,000	$ 11,530,000	$ 15,192,000
Net accounts receivable	693,085,000	615,265,000
Accounts receivable due after one year	1,624,000	3,272,000
Accounts receivable from related parties	36,000	2,490,000
Reserve for doubtful receivables from related parties	$ 0	$ 0

Fair Value of Assets and Liabil

Fair Value of Assets and Liabilities Measured on Recurring Basis, Including Derivative Instruments (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands		Dec. 31, 2017	Dec. 31, 2016
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative instrument, asset	[1],[2]	$ 73,098	$ 55,386
Total, assets		73,098	55,386
Earnout Consideration	[3],[4]	24,732	22,435
Derivative instrument, liability	[2],[3]	18,188	17,353
Total, liabilities		42,920	39,788
Redeemable non-controlling interest	[5]	4,750	4,520
Fair Value, Inputs, Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative instrument, asset	[1],[2]	73,098	55,386
Total, assets		73,098	55,386
Derivative instrument, liability	[2],[3]	18,188	17,353
Total, liabilities		18,188	17,353
Fair Value, Inputs, Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Earnout Consideration	[3],[4]	24,732	22,435
Total, liabilities		24,732	22,435
Redeemable non-controlling interest	[5]	$ 4,750	$ 4,520
[1]	Included in prepaid expenses and other current assets and other assets in the consolidated balance sheets.
[2]	The Company values its derivative instruments based on market observable inputs, including both forward and spot prices for the relevant currencies and interest rate indices for relevant interest rates. The quotes are taken from an independent market database
[3]	Included in accrued expenses and other current liabilities and other liabilities in the consolidated balance sheets.
[4]	The fair value of earn-out consideration, calculated as the present value of expected future payments to be made to the sellers of acquired businesses, was derived by estimating the future financial performance of the acquired businesses using the earn-out formula and performance targets specified in each purchase agreement and adjusting the result to reflect the Company’s estimate of the likelihood of achievement of such targets. Given the significance of the unobservable inputs, the valuations are classified in level 3 of the fair value hierarchy.
[5]	The Company’s estimate of the fair value of redeemable non-controlling interest as of December 31, 2017 is based on unobservable inputs considering the assumptions that market participants would make in pricing the obligation. Given the significance of the unobservable inputs, the valuation was classified in level 3 of the fair value hierarchy. Refer to Note 3—Business Acquisitions.

Fair Value of Earn-out Consider

Fair Value of Earn-out Consideration (Detail) - Fair Value, Inputs, Level 3 - Business Acquisition Contingent Consideration - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Opening balance		$ 22,435	$ 22,820
Earn-out consideration payable in connection with acquisitions		10,720	14,550
Payments made of earn-out consideration		(7,239)	(1,611)
Change in fair value	[1]	(3,695)	(14,869)
Other	[2]	2,511	1,545
Ending balance		$ 24,732	$ 22,435
[1]	Changes in the fair value of earn-out consideration are reported in other operating (income) expense, net in the consolidated statements of income.
[2]	Interest expense is included in interest income (expense), net and the impact of changes in foreign exchange is reported in foreign exchange gains (losses), net in the consolidated statements of income. The cumulative translation adjustment is reported as a component of other comprehensive income (loss).

Derivative Financial Instrume83

Derivative Financial Instruments - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Derivative [Line Items]
Amount of gain (loss) recognized in income on ineffective portion of derivatives and amount excluded from effectiveness testing	$ 0	$ 0	$ 0
Forward Foreign Exchange Contracts | Maximum
Derivative [Line Items]
Derivative financial instrument contracts, maturity period	60 months
Interest Rate Swaps | Maximum
Derivative [Line Items]
Derivative financial instrument contracts, maturity period	60 months

Aggregate Notional Principal Am

Aggregate Notional Principal Amounts of Outstanding Derivative Financial Instruments with Related Balance Sheet Exposure (Detail) - USD ($)		Dec. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Derivative financial instrument, balance sheet exposure asset (liability)	[1]	$ 54,910,000	$ 38,034,000
United States Dollars (sell) Indian Rupees (buy)
Derivative [Line Items]
Derivative instrument notional principal amount	[2]	1,289,400,000	1,108,400,000
Derivative financial instrument, balance sheet exposure asset (liability)	[1]	54,398,000	6,669,000
United States Dollars (sell) Mexican Peso (buy)
Derivative [Line Items]
Derivative instrument notional principal amount	[2]	9,000,000	9,120,000
Derivative financial instrument, balance sheet exposure asset (liability)	[1]	(441,000)	(187,000)
United States Dollars (sell) Philippines Peso (buy)
Derivative [Line Items]
Derivative instrument notional principal amount	[2]	76,650,000	70,050,000
Derivative financial instrument, balance sheet exposure asset (liability)	[1]	69,000	(1,036,000)
Euro (sell) United States Dollars (buy)
Derivative [Line Items]
Derivative instrument notional principal amount	[2]	170,542,000	138,613,000
Derivative financial instrument, balance sheet exposure asset (liability)	[1]	(2,069,000)	9,180,000
Pound Sterling (buy) United States Dollars (sell)
Derivative [Line Items]
Derivative instrument notional principal amount	[2]	24,041,000
Derivative financial instrument, balance sheet exposure asset (liability)	[1]	253,000
Euro (sell) Romanian Leu (buy)
Derivative [Line Items]
Derivative instrument notional principal amount	[2]	35,826,000	29,805,000
Derivative financial instrument, balance sheet exposure asset (liability)	[1]	(892,000)	(152,000)
Japanese Yen (sell) Chinese Renminbi (buy)
Derivative [Line Items]
Derivative instrument notional principal amount	[2]	60,768,000	77,267,000
Derivative financial instrument, balance sheet exposure asset (liability)	[1]	1,918,000	(742,000)
Pound Sterling (sell) United States Dollars (buy)
Derivative [Line Items]
Derivative instrument notional principal amount	[2]	80,871,000	104,142,000
Derivative financial instrument, balance sheet exposure asset (liability)	[1]	(2,478,000)	14,228,000
Australian Dollars (sell) United States Dollars (buy)
Derivative [Line Items]
Derivative instrument notional principal amount	[2]	136,092,000	114,412,000
Derivative financial instrument, balance sheet exposure asset (liability)	[1]	(5,180,000)	2,328,000
Interest Rate Swap Floating To Fixed [Member]
Derivative [Line Items]
Derivative instrument notional principal amount	[2]	432,117,000	456,810,000
Derivative financial instrument, balance sheet exposure asset (liability)	[1]	$ 9,332,000	$ 7,746,000
[1]	Balance sheet exposure is denominated in U.S. dollars and denotes the mark-to-market impact of the derivative financial instruments on the reporting date.
[2]	Notional amounts are key elements of derivative financial instrument agreements but do not represent the amount exchanged by counterparties and do not measure the Company’s exposure to credit, foreign exchange, interest rate or other market risks. However, the amounts exchanged are based on the notional amounts and other provisions of the underlying derivative financial instrument agreements.

Fair Values of Derivative Instr

Fair Values of Derivative Instruments and Location in Financial Statements (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Prepaid Expenses and Other Current Assets | Not Designated as Hedging Instrument
Derivatives Fair Value [Line Items]
Fair value of assets	$ 4,635	$ 809
Accrued Expenses and Other Current Liabilities | Not Designated as Hedging Instrument
Derivatives Fair Value [Line Items]
Fair value of liabilities	254	237
Cash Flow Hedges | Prepaid Expenses and Other Current Assets
Derivatives Fair Value [Line Items]
Fair value of assets	43,557	33,921
Cash Flow Hedges | Other Assets
Derivatives Fair Value [Line Items]
Fair value of assets	24,906	20,657
Cash Flow Hedges | Accrued Expenses and Other Current Liabilities
Derivatives Fair Value [Line Items]
Fair value of liabilities	10,092	4,540
Cash Flow Hedges | Other Liabilities
Derivatives Fair Value [Line Items]
Fair value of liabilities	$ 7,842	$ 12,576

Cash Flow Hedges, Gains (Losses

Cash Flow Hedges, Gains (Losses) Recorded as Component of Other Comprehensive Income (Loss) or Other Comprehensive Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Opening balance, before-tax amount	$ 37,461	$ (30,090)	$ (66,786)
Net gains (losses) reclassified into statement of income upon completion of hedged transactions, before-tax amount	54,494	(6,799)	(42,106)
Changes in fair value of effective portion of outstanding derivatives, net, before-tax amount	67,562	60,752	(5,410)
Gain (loss) on cash flow hedging derivatives, net, before-tax amount	13,068	67,551	36,696
Closing balance, before-tax amount	50,529	37,461	(30,090)
Opening balance, tax (expense) or benefit	(13,979)	9,830	23,646
Net gains (losses) reclassified into statement of income upon completion of hedged transactions, tax (expense) or benefit	(17,725)	409	15,346
Changes in fair value of effective portion of outstanding derivatives, net, tax (expense) or benefit	(18,182)	(23,400)	1,530
Gain (loss) on cash flow hedging derivatives, net, tax (expense) or benefit	(457)	(23,809)	(13,816)
Closing balance, tax (expense) or benefit	(14,436)	(13,979)	9,830
Opening balance, net of tax amount	23,482	(20,260)	(43,140)
Net gains (losses) reclassified into statement of income upon completion of hedged transactions, net of tax amount	36,769	(6,390)	(26,760)
Changes in fair value of effective portion of outstanding derivatives, net, net of tax amount	49,380	37,352	(3,880)
Gain (loss) on cash flow hedging derivatives, net of taxes amount	12,611	43,742	22,880
Closing balance, net of tax amount	$ 36,093	$ 23,482	$ (20,260)

Gains or Losses Recorded as Com

Gains or Losses Recorded as Component of Other Comprehensive Income (Loss) or Other Comprehensive Income (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other Comprehensive Income (Loss) [Line Items]
Amount of Gain (loss) recognized in OCI on Derivatives (Effective Portion)		$ 67,562	$ 60,752	$ (5,410)
Amount of Gain (loss) reclassified from OCI into Statement of Income (Effective Portion)		54,494	(6,799)	(42,106)
Non designated Hedges, amount of (Gain) Loss recognized in Statement of Income on Derivatives		16,696	2,921	6,566
Net revenues
Other Comprehensive Income (Loss) [Line Items]
Amount of Gain (loss) reclassified from OCI into Statement of Income (Effective Portion)		5,858	12,859	13,667
Cost of Revenue
Other Comprehensive Income (Loss) [Line Items]
Amount of Gain (loss) reclassified from OCI into Statement of Income (Effective Portion)		37,849	(14,223)	(44,634)
Selling, General and Administrative Expenses
Other Comprehensive Income (Loss) [Line Items]
Amount of Gain (loss) reclassified from OCI into Statement of Income (Effective Portion)		10,849	(3,765)	(11,139)
Interest Expense
Other Comprehensive Income (Loss) [Line Items]
Amount of Gain (loss) reclassified from OCI into Statement of Income (Effective Portion)		(62)	(1,670)
Forward Foreign Exchange Contracts
Other Comprehensive Income (Loss) [Line Items]
Amount of Gain (loss) recognized in OCI on Derivatives (Effective Portion)		66,037	54,664	(5,410)
Forward Foreign Exchange Contracts | Foreign Exchange (Gains) Losses, Net
Other Comprehensive Income (Loss) [Line Items]
Non designated Hedges, amount of (Gain) Loss recognized in Statement of Income on Derivatives	[1]	16,696	2,921	$ 6,566
Interest Rate Swaps
Other Comprehensive Income (Loss) [Line Items]
Amount of Gain (loss) recognized in OCI on Derivatives (Effective Portion)		$ 1,525	$ 6,088
[1]	These forward foreign exchange contracts were entered into to hedge fluctuations in foreign exchange rates for recognized balance sheet items, such as receivables and intercompany borrowings, and were not originally designated as hedges under FASB guidance on derivatives and hedging. Realized gains (losses) and changes in the fair value of these derivatives are recorded in foreign exchange gains (losses), net in the consolidated statements of income.

Prepaid Expenses and Other Cu88

Prepaid Expenses and Other Current Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Prepaid Expense And Other Assets Current [Abstract]
Advance income and non-income taxes	$ 51,832	$ 50,676
Deferred transition costs	62,029	45,252
Derivative instruments	48,192	34,730
Prepaid expenses	16,944	22,222
Customer acquisition cost	19,327	11,126
Employee advances	5,014	6,880
Deposits	4,719	2,688
Advances to suppliers	2,705	10,059
Others	25,580	5,516
Prepaid expenses and other current assets, net	$ 236,342	$ 189,149

Property, Plant and Equipment89

Property, Plant and Equipment, Net (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 666,031	$ 600,554
Less: accumulated depreciation, amortization and impairment	(459,001)	(407,336)
Property, plant and equipment, net	207,030	193,218
Land
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	10,209	9,635
Buildings
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	46,007	44,487
Furniture and Fixtures
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	43,091	37,421
Computer Equipment and Servers
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	210,725	187,119
Plant, Machinery and Equipment
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	92,981	84,677
Computer Software
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	137,459	119,648
Leasehold Improvements
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	102,072	92,313
Vehicles
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	6,418	6,753
Capital Work in Progress
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 17,069	$ 18,501

Property, Plant and Equipment90

Property, Plant and Equipment, Net - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property Plant And Equipment [Line Items]
Depreciation and amortization	$ 58,503	$ 54,553	$ 54,286
Property, plant and equipment held under capital lease arrangements, gross	3,302	3,183
Tangible assets write-down	8,000
Technology Related Intangible Assets
Property Plant And Equipment [Line Items]
Tangible assets write-down	2,240
Software Amortization
Property Plant And Equipment [Line Items]
Depreciation and amortization	11,400	9,471	9,114
Effect of Reclassification of Foreign Exchange (Gains) Losses
Property Plant And Equipment [Line Items]
Depreciation and amortization	(1,727)	744	2,501
Assets Held Under Capital Leases
Property Plant And Equipment [Line Items]
Depreciation and amortization	1,682	1,564	1,594
Depreciation Expense on Property, Plant And Equipment
Property Plant And Equipment [Line Items]
Depreciation and amortization	44,909	$ 45,826	$ 47,673
Computer Software
Property Plant And Equipment [Line Items]
Tangible assets write-down	$ 5,760

Changes in Goodwill (Detail)

Changes in Goodwill (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Goodwill And Intangible Assets Disclosure [Abstract]
Opening balance	$ 1,069,408	$ 1,038,346
Goodwill relating to acquisitions consummated during the period	229,745	51,535
Goodwill relating to divestitures during the period		(2,226)
Impact of measurement period adjustments	(106)	(59)
Effect of exchange rate fluctuations	38,075	(18,188)
Closing balance	$ 1,337,122	$ 1,069,408

Goodwill Allocated to Reporting

Goodwill Allocated to Reporting Units (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Goodwill [Line Items]
Goodwill	$ 1,337,122	$ 1,069,408	$ 1,038,346
India
Goodwill [Line Items]
Goodwill	735,596	493,084
China
Goodwill [Line Items]
Goodwill	60,171	58,139
Europe
Goodwill [Line Items]
Goodwill	41,775	36,584
Americas
Goodwill [Line Items]
Goodwill	57,021	48,713
IT Services
Goodwill [Line Items]
Goodwill	$ 442,559	$ 432,888

Goodwill and Intangible Asset93

Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Line Items]
Goodwill deductible for tax purposes	$ 120,617,000	$ 39,032,000
Amortization of acquired intangible assets	36,412,000	27,183,000	$ 28,513,000
Technology-related intangible assets
Goodwill and Intangible Assets Disclosure [Line Items]
Amortization of acquired intangible assets	467,000	0	$ 0
Customer-Related Intangible Assets
Goodwill and Intangible Assets Disclosure [Line Items]
Intangible assets write-down	$ 1,311,000	871,000
Intangible Software Asset
Goodwill and Intangible Assets Disclosure [Line Items]
Intangible assets write-down		10,324,000
IT Services
Goodwill and Intangible Assets Disclosure [Line Items]
Goodwill impairment		$ 0

Intangible Assets Acquired Eith

Intangible Assets Acquired Either Individually or with Group of Other Assets or in Business Combination (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Acquired Finite Lived Intangible Assets [Line Items]
Gross carrying amount	$ 494,423	$ 393,027
Accumulated amortization & Impairment	362,833	314,081
Net	131,590	78,946
Customer-Related Intangible Assets
Acquired Finite Lived Intangible Assets [Line Items]
Gross carrying amount	369,173	312,041
Accumulated amortization & Impairment	293,029	260,018
Net	76,144	52,023
Marketing-Related Intangible Assets
Acquired Finite Lived Intangible Assets [Line Items]
Gross carrying amount	52,443	45,098
Accumulated amortization & Impairment	39,212	30,571
Net	13,231	14,527
Technology-related intangible assets
Acquired Finite Lived Intangible Assets [Line Items]
Gross carrying amount	54,189	26,116
Accumulated amortization & Impairment	28,278	21,026
Net	25,911	5,090
Other Intangible Assets
Acquired Finite Lived Intangible Assets [Line Items]
Gross carrying amount	3,081	2,875
Accumulated amortization & Impairment	2,314	2,466
Net	767	409
Intangible Assets Under Development [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Gross carrying amount	15,537	6,897
Net	$ 15,537	$ 6,897

Estimated Amortization Schedule

Estimated Amortization Schedule of Intangible Assets for Future Periods (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Goodwill And Intangible Assets Disclosure [Abstract]
2,018	$ 38,569
2,019	27,518
2,020	26,831
2,021	13,080
2022 and beyond	25,592
Net	$ 131,590	$ 78,946

Other Assets (Detail)

Other Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Other Assets Noncurrent Disclosure [Abstract]
Customer acquisition cost	$ 37,017	$ 30,996
Advance income and non-income taxes	63,474	60,203
Deferred transition costs	77,255	74,462
Deposits	32,174	29,853
Derivative instruments	24,906	20,657
Prepaid expenses	2,849	3,179
Accounts receivable due after one year	1,624	3,272
Others	22,870	19,706
Other assets	$ 262,169	$ 242,328

Future Minimum Lease Payments u

Future Minimum Lease Payments under Operating Lease Arrangements (Detail) $ in Thousands	Dec. 31, 2017USD ($)
Leases [Abstract]
2,018	$ 59,269
2,019	54,844
2,020	47,788
2,021	43,692
2,022	38,275
2023 and beyond	122,150
Total minimum lease payments	$ 366,018

Leases - Additional Information

Leases - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Leases [Abstract]
Rent expenses	$ 59,484	$ 50,827	$ 50,342
Rental expense including effect of reclassification of foreign exchange (gains) losses	$ (1,533)	$ 598	$ 2,037

Accrued Expenses and Other Cu99

Accrued Expenses and Other Current Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Accrued Liabilities And Other Liabilities [Abstract]
Accrued expenses	$ 204,997	$ 163,400
Accrued employee cost	204,506	179,360
Deferred transition revenue	52,233	50,552
Statutory liabilities	36,283	36,878
Retirement benefits	21,074	17,616
Derivative instruments	10,346	4,777
Advance from customers	25,476	21,969
Earn-out consideration	14,928	6,885
Other liabilities	13,093	15,461
Capital lease obligations	1,546	1,349
Accrued expenses and other current liabilities, net	$ 584,482	$ 498,247

Long-Term Debt - Additional Inf

Long-Term Debt - Additional Information (Detail)	1 Months Ended		12 Months Ended
	Mar. 31, 2017USD ($)Day	Jun. 30, 2015USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Aug. 30, 2012USD ($)
Debt Instrument [Line Items]
Extinguishment of outstanding term loan		$ 663,188,000
Acceleration amortization of debt issuance cost		$ 10,050,000
Margin over LIBOR		1.50%	1.50%	1.50%
Debt discount and underwriting fee			$ 2,630,000		$ 6,584,000
New Credit Facility
Debt Instrument [Line Items]
Margin over LIBOR		1.50%
Credit facility, base rate		0.50%
3.70% Senior Notes
Debt Instrument [Line Items]
Debt amount outstanding			347,761,000
Debt amortization expense			$ 2,239,000
Principal amount of senior notes issued	$ 350,000,000
Interest rate on senior notes	3.70%
Net proceeds from issue of senior notes	$ 348,519,000
Debt discount and underwriting fee	1,481,000
Other debt issuance costs	1,161,000
Total debt issuance cost	$ 2,642,000
Debt instrument, maturity date			Apr. 1, 2022
Debt instrument description			The Company will pay interest on the notes semi-annually in arrears on April 1 and October 1 of each year, ending on the maturity date of April 1, 2022.
Debt instrument redemption price percentage	100.00%
Debt instrument redemption date			Mar. 1, 2022
Debt repurchase price as percentage of aggregate principal value upon certain change of controls	101.00%
Maximum increase in downgrade of credit rating of notes to adjust interest rate payable	2.00%
Debt instrument, percentage increase in interest payable on notes if exchange offer fails during first 90 days	0.25%
Debt instrument, number of days to provide offer to exchange notes for registered notes | Day	455
Debt instrument, percentage increase in interest payable on notes if exchange offer fails, after first 90 days	0.25%
Debt instrument, percentage increase in interest payable on notes if exchange offer fails, maximum	0.50%
Term Loan Credit Facility
Debt Instrument [Line Items]
Debt amount outstanding			$ 698,152,000	$ 737,333,000
Debt amortization expense			1,848,000	$ 2,667,000
Principal amount of term loan			$ 10,000,000
Credit facility, frequency of payments			Quarterly
Maturity date of term loan agreement			Jun. 30, 2020
Term Loan Credit Facility | New Credit Facility
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity		$ 800,000,000
Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity			$ 350,000,000			$ 250,000,000
Acceleration amortization of debt issuance cost		65,000
Revolving Credit Facility | New Credit Facility
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity		$ 350,000,000

Maturity Profile of Term Loan N

Maturity Profile of Term Loan Net of Debt Amortization Expense (Detail) - Term Loan Credit Facility - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
2,018	$ 39,226
2,019	39,272
2,020	619,654
Total	$ 698,152	$ 737,333

Short-Term Borrowings - Additio

Short-Term Borrowings - Additional Information (Detail) - USD ($)	1 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2017	Dec. 31, 2016	Aug. 30, 2012
Line Of Credit Facility [Line Items]
Fund-based and non-fund-based credit facilities limits available		$ 15,064,000	$ 15,382,000
Utilization of credit facility for non fund-based usage		7,900,000	10,980,000
Credit facility, amount utilized		170,978,000	160,978,000
Short-term borrowings		$ 170,000,000	$ 160,000,000
Revolving credit facility, expiration month and year		2020-06
Margin over LIBOR	1.50%	1.50%	1.50%
Percentage of commitment fee		0.25%	0.25%
Line of credit covenant condition		The credit agreement contains certain customary covenants, including a maximum leverage covenant and a minimum interest coverage ratio.
Revolving Credit Facility
Line Of Credit Facility [Line Items]
Credit facility, maximum borrowing capacity		$ 350,000,000		$ 250,000,000
Non-Fund-Based Credit Facility
Line Of Credit Facility [Line Items]
Credit facility, amount utilized		$ 978,000	$ 978,000
Fund-Based Credit Facility
Line Of Credit Facility [Line Items]
Margin over LIBOR		1.50%	1.50%

Other Liabilities (Detail)

Other Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Other Liabilities Disclosure [Abstract]
Accrued employee cost	$ 14,020	$ 3,976
Deferred transition revenue	70,900	72,560
Retirement benefits	40,520	39,020
Derivative instruments	7,842	12,576
Amount received from GE under indemnification arrangement, pending adjustment	3,359	3,159
Advance from customers	790	2,371
Earn-out consideration	9,804	15,550
Others	18,710	11,078
Capital lease obligations	2,664	2,500
Other Liabilities	$ 168,609	$ 162,790

Funded Status of Defined Benefi

Funded Status of Defined Benefit Plans and Amount Recognized (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Compensation And Retirement Disclosure [Abstract]
Projected benefit obligation at the beginning of the year	$ 45,283	$ 35,617
Service cost	7,735	5,661	$ 5,578
Actuarial loss	4,493	6,749
Interest cost	3,252	2,585	2,629
Liabilities assumed on acquisition		693
Benefits paid	(5,367)	(4,967)
Special termination benefit	57
Effect of exchange rate changes	2,641	(1,055)
Projected benefit obligation at the end of the year	58,094	45,283	35,617
Fair value of plan assets at the beginning of the year	30,871	28,549
Employer contributions	15,176	5,776
Actual gain on plan assets	2,746	1,777
Assets assumed on acquisition	0	170
Actuarial gain	11
Benefits paid	(5,301)	(4,897)
Effect of exchange rate changes	2,057	(504)
Fair value of plan assets at the end of the year	$ 45,560	$ 30,871	$ 28,549

Amounts Included in Other Compr

Amounts Included in Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Compensation And Retirement Disclosure [Abstract]
Net actuarial loss	$ (12,228)	$ (8,979)
Deferred tax assets	2,221	2,759
Other comprehensive income, net	$ (10,007)	$ (6,220)

Changes in Other Comprehensive

Changes in Other Comprehensive Income (Loss) (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)
Compensation And Retirement Disclosure [Abstract]
Net actuarial loss	$ (4,182)
Amortization of net actuarial loss	1,177
Deferred income taxes	(670)
One-time cost	211
Effect of exchange rate changes	(323)
Other comprehensive income (loss), net	$ (3,787)

Net Defined Benefit Plan Costs

Net Defined Benefit Plan Costs (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Compensation And Retirement Disclosure [Abstract]
Service costs	$ 7,735	$ 5,661	$ 5,578
Interest costs	3,252	2,585	2,629
Amortization of actuarial loss	1,177	(113)	330
Expected return on plan assets	(2,412)	(2,043)	(2,154)
One-time cost	209
Special termination benefits	426
Net defined benefit plan costs	$ 10,387	$ 6,090	$ 6,383

Employee Benefit Plans - Additi

Employee Benefit Plans - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)
Defined Benefit Plan Disclosure [Line Items]
Amount in other comprehensive loss expected to be recognized as component of net periodic benefit cost over next fiscal year	$ 1,353
Benefit Obligations Of Philippines Plan | Minimum
Defined Benefit Plan Disclosure [Line Items]
Expectation of the average long term rate of return expected, years	15 years
Benefit Obligations Of Philippines Plan | Maximum
Defined Benefit Plan Disclosure [Line Items]
Expectation of the average long term rate of return expected, years	20 years

Weighted Average Assumptions us

Weighted Average Assumptions used to Determine Benefit Obligations, Gratuity Plan (Detail) - Benefit Obligations Of Gratuity Plan	Dec. 31, 2017	Dec. 31, 2016
Minimum
Defined Benefit Plan Disclosure [Line Items]
Discount rate	7.40%	7.10%
Rate of increase in compensation per annum	5.20%	5.20%
Maximum
Defined Benefit Plan Disclosure [Line Items]
Discount rate	7.60%	7.50%
Rate of increase in compensation per annum	11.00%	11.00%

Weighted Average Assumptions110

Weighted Average Assumptions used to Determine Plan Costs, Gratuity Plan (Detail) - Gratuity Plan Costs	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return on plan assets per annum	7.50%	7.50%	8.50%
Minimum
Defined Benefit Plan Disclosure [Line Items]
Discount rate	7.10%	8.30%	8.50%
Rate of increase in compensation per annum	5.20%	5.20%	5.20%
Maximum
Defined Benefit Plan Disclosure [Line Items]
Discount rate	7.50%	8.45%	8.55%
Rate of increase in compensation per annum	11.00%	11.00%	11.00%

Weighted Average Assumptions111

Weighted Average Assumptions used to Determine Benefit Obligations, Mexican Plan (Detail) - Benefit Obligations Of Mexican Plan	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Discount rate	7.60%	6.80%
Rate of increase in compensation per annum	5.50%	5.50%

Weighted Average Assumptions112

Weighted Average Assumptions used to Determine Plan Costs, Mexican Plan (Detail) - Mexican Plan Costs	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Discount rate	6.80%	6.50%	6.50%
Rate of increase in compensation per annum	5.50%	5.50%	5.50%
Expected long-term rate of return on plan assets per annum	0.00%	0.00%	0.00%

Weighted Average Assumptions113

Weighted Average Assumptions used to Determine Benefit Obligations, Japan Plan (Detail) - Benefit Obligations Of Japan Plan	Dec. 31, 2017	Dec. 31, 2016
Minimum
Defined Benefit Plan Disclosure [Line Items]
Discount rate	0.113%	0.08%
Rate of increase in compensation per annum	0.00%	0.00%
Maximum
Defined Benefit Plan Disclosure [Line Items]
Discount rate	0.789%	1.30%
Rate of increase in compensation per annum	3.55%	3.55%

Weighted Average Assumptions114

Weighted Average Assumptions used to Determine Plan Costs, Japan Plan (Detail) - Japan Plan Costs	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Minimum
Defined Benefit Plan Disclosure [Line Items]
Discount rate	0.08%	0.24%	0.20%
Rate of increase in compensation per annum	0.00%	0.00%	0.00%
Expected long-term rate of return on plan assets per annum	0.00%	0.00%	2.69%
Maximum
Defined Benefit Plan Disclosure [Line Items]
Discount rate	1.30%	1.30%	1.30%
Rate of increase in compensation per annum	3.55%	3.55%	3.55%
Expected long-term rate of return on plan assets per annum	3.09%	3.77%	3.44%

Fair Value of Plan Assets (Deta

Fair Value of Plan Assets (Detail) - USD ($) $ in Thousands		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value		$ 45,560	$ 30,871	$ 28,549
Fair Value, Inputs, Level 1
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value		6,328	10,001
Fair Value, Inputs, Level 2
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value		39,232	20,870
Cash
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value		472	4,809
Cash | Fair Value, Inputs, Level 1
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value		472	4,809
Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	[1]	42,328	23,659
Fixed Income Securities | Fair Value, Inputs, Level 1
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	[1]	3,419	3,001
Fixed Income Securities | Fair Value, Inputs, Level 2
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	[1]	38,909	20,658
Other Securities
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	[2]	2,760	2,403
Other Securities | Fair Value, Inputs, Level 1
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	[2]	2,437	2,191
Other Securities | Fair Value, Inputs, Level 2
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	[2]	$ 323	$ 212
[1]	Includes investments in funds that invest 100% of their assets in fixed income securities such as money market instruments, government securities and public and private bonds
[2]	Includes investments in funds that invest primarily in fixed income securities and the remaining portion in equity securities.

Fair Value of Plan Assets (Pare

Fair Value of Plan Assets (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Percentage of investment in funds	100.00%	100.00%

Expected Benefit Plan Payments

Expected Benefit Plan Payments Reflecting Expected Future Service (Detail) $ in Thousands	Dec. 31, 2017USD ($)
Compensation And Retirement Disclosure [Abstract]
2,018	$ 8,469
2,019	8,823
2,020	9,330
2,021	9,946
2,022	10,118
2023 - 2027	48,107
Defined benefit plan expected future benefit payments	$ 94,793

Amounts Contributed to Defined

Amounts Contributed to Defined Contribution Plans in Various Jurisdictions (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Contribution Plan Disclosure [Line Items]
Defined contribution plans, contributed amount	$ 61,221	$ 56,242	$ 47,717
India
Defined Contribution Plan Disclosure [Line Items]
Defined contribution plans, contributed amount	22,242	19,074	15,915
U.S.
Defined Contribution Plan Disclosure [Line Items]
Defined contribution plans, contributed amount	11,147	10,379	8,148
U.K.
Defined Contribution Plan Disclosure [Line Items]
Defined contribution plans, contributed amount	7,823	6,593	4,453
China
Defined Contribution Plan Disclosure [Line Items]
Defined contribution plans, contributed amount	15,950	15,512	14,511
Other Regions
Defined Contribution Plan Disclosure [Line Items]
Defined contribution plans, contributed amount	$ 4,059	$ 4,684	$ 4,690

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Detail) - USD ($)

Dec. 20, 2017

Sep. 21, 2017

Jun. 28, 2017

Mar. 28, 2017

Apr. 11, 2012

Jan. 31, 2015

Dec. 31, 2017

Sep. 30, 2017

Jun. 30, 2017

Mar. 31, 2017

Dec. 31, 2017

Dec. 31, 2016

Dec. 31, 2015

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

May 09, 2017

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Stock based compensation cost

$ 35,112,000

$ 24,686,000

$ 24,684,000

Tax benefit recognized in relation to stock based compensation

$ 9,600,000

$ 6,446,000

6,125,000

Options granted, contractual period, years

10 years

Cash dividend paid per share

$ 0.06

$ 0.06

$ 0.06

$ 0.06

$ 0.06

$ 0.06

$ 0.06

$ 0.06

$ 0

Cash received from the exercise of stock option

$ 10,772,000

$ 14,896,000

13,564,000

Cash tax benefit realized from the exercise of stock option

2,016,000

1,548,000

6,982,000

Excess tax benefit on stock-based compensation

6,560,000

Unrecognized stock-based compensation cost for options

$ 6,479,000

6,479,000

Employee Stock Option

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Excess tax benefit on stock-based compensation

$ 1,723,000

$ 1,004,000

$ 6,560,000

Weighted average remaining requisite vesting period

2 years 10 months 24 days

Restricted Share Units (RSUs)

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Weighted average remaining requisite vesting period

2 years 10 months 24 days

Unrecognized stock-based compensation cost

26,543,000

$ 26,543,000

Shares to be issued on vested awards other than options

53,546

86,517

92,692

61,057

Performance Units

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Weighted average remaining requisite vesting period

2 years

Unrecognized stock-based compensation cost

$ 28,992,000

$ 28,992,000

Performance Units

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Minimum statutory withholding taxes, Shares

845,524

Performance Units | January, 2015

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Shares to be issued on vested awards other than options

1,329,270

Employee Stock Purchase Plan

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Percentage of fair value per share allowed to eligible employees to purchase through payroll deductions

90.00%

Maximum percentage of employee's base salary allowed to be purchased

15.00%

15.00%

Maximum dollar amount of common shares allowed to be purchased

$ 25,000

Common shares reserved for issuance

4,200,000

4,200,000

Issuance of common shares under the employee stock purchase plan (in shares)

190,435

146,685

121,485

Compensation expense for ESPP

$ 573,000

$ 428,000

$ 292,000

Minimum

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Award, vesting period, years

4 years

Minimum | Restricted Share Units (RSUs)

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Award, vesting period, years

3 months

Minimum | Performance Units

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Award, vesting period, years

6 months

Maximum

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Award, vesting period, years

5 years

Maximum | Restricted Share Units (RSUs)

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Award, vesting period, years

4 years

Maximum | Performance Units

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Award, vesting period, years

3 years

2007 Omnibus Plan

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Amended Omnibus Plan, increase in number of common shares authorized for issuance

5,593,200

8,858,823

Number of common shares authorized for issuance

15,000,000

23,858,823

23,858,823

Genpact Limited 2017 Omnibus Incentive Compensation Plan

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Number of common shares authorized for issuance

15,000,000

Significant Assumptions used in

Significant Assumptions used in Determination of Fair Value of Options Granted (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Dividend yield	0.97%
Expected life (in months)	84 months	84 months	84 months
Risk-free rate of interest for expected life	2.25%		1.99%
Risk-free rate of interest for expected life, minimum		1.42%
Risk-free rate of interest for expected life, maximum		1.56%
Volatility	24.28%		34.97%
Volatility, minimum		25.60%
Volatility, maximum		27.22%

Summary of Stock Option Activit

Summary of Stock Option Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Shares arising out of options
Outstanding, shares arising out of options, beginning balance		5,707,690	5,986,845	7,371,727
Granted, shares arising out of options		250,000	860,000	170,000
Forfeited, shares arising out of options		(80,000)	(145,000)	(125,000)
Expired, shares arising out of options				(1,277)
Exercised, shares arising out of options		(743,045)	(994,155)	(1,428,605)
Outstanding, shares arising out of options, ending balance		5,134,645	5,707,690	5,986,845	7,371,727
Vested and expected to vest thereafter, shares arising out of options	[1]	4,988,875	5,457,701	5,754,969
Vested and exercisable, shares arising out of options		2,203,146	2,746,191	2,183,846
Weighted average grant-date fair value of options granted during the period		$ 6.62	$ 8.50	$ 9.15
Weighted average exercise price
Outstanding weighted average exercise price, beginning balance		18.65	16.99	15.44
Granted, weighted average exercise price		24.74	26.80	22.77
Forfeited, weighted average exercise price		20.63	17.77	19.35
Expired, weighted average exercise price				14.32
Exercised, weighted average exercise price		14.50	14.98	9.49
Outstanding weighted average exercise price, ending balance		19.52	18.65	16.99	$ 15.44
Vested and expected to vest thereafter, weighted average exercise price	[1]	19.36	18.42	16.76
Vested and exercisable, weighted average exercise price		$ 16.17	$ 15.62	$ 12.67
Weighted average remaining contractual life (years)
Outstanding weighted average remaining contractual life (years)		5 years 7 months 6 days	5 years 9 months 18 days	5 years 9 months 18 days	5 years 10 months 24 days
Vested and expected to vest thereafter, weighted average remaining contractual life (years)	[1]	5 years 7 months 6 days	5 years 9 months 18 days	5 years 9 months 18 days
Vested and exercisable, weighted average remaining contractual life (years)		4 years 1 month 6 days	4 years	2 years 8 months 12 days
Aggregate intrinsic value
Exercised, aggregate intrinsic value		$ 12,636	$ 9,301	$ 22,122
Outstanding aggregate intrinsic value, ending balance		62,743	34,641	48,661
Vested and expected to vest thereafter, aggregate intrinsic value	[1]	61,779	34,150	47,325
Vested and exercisable, aggregate intrinsic value		$ 34,303	$ 23,960	$ 26,892
[1]	Options expected to vest reflect an estimated forfeiture rate.

Summary of Restricted Share Uni

Summary of Restricted Share Units Granted (Detail) - Restricted Share Units (RSUs) - $ / shares		1 Months Ended	12 Months Ended
		Jan. 31, 2015	Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015		Dec. 31, 2014	Dec. 31, 2013
Number of Restricted Share Units
Outstanding number of shares (Units), beginning balance		488,418	117,905		157,390		488,418
Granted, number of shares (Units)			1,533,836		95,553		53,546
Vested, number of shares (Units)			(45,248)	[1]	(133,903)	[2]	(351,338)	[3]
Forfeited, number of shares (Units)			(1,242)		(1,135)		(33,236)
Outstanding number of shares (Units), ending balance			1,605,251		117,905		157,390		488,418
Expected to vest, number of shares (Units)	[4]		1,371,567		107,366		147,226
Weighted Average Grant Date Fair Value
Outstanding weighted average grant date fair value, beginning balance		$ 15.36	$ 20.65		$ 17.67		$ 15.36
Granted, weighted average grant date fair value			26.36		25.49		20.88
Vested, weighted average grant date fair value			18.31	[1]	20.66	[2]	15.29	[3]
Forfeited, weighted average grant date fair value			25.53		14.18		14
Outstanding weighted average grant date fair value, ending balance			$ 26.17		$ 20.65		$ 17.67		$ 15.36
Shares to be issued on vested awards other than options			53,546		86,517				92,692	61,057
Vested in December 31, 2014
Weighted Average Grant Date Fair Value
Vested RSU issued during the period					91,963
Vested in December 31, 2013
Weighted Average Grant Date Fair Value
Vested RSU issued during the period		59,827
[1]	Vested RSUs were net settled by issuing 32,395 shares (net of minimum statutory tax withholding).
[2]	Vested RSUs were net settled by issuing 29,719 shares (net of minimum statutory tax withholding). 86,517 RSUs vested in the year ended December 31, 2016. 17,802 common shares underlying 34,035 of such RSUs were issued in 2017 after withholding shares to the extent of minimum statutory withholding taxes. Shares underlying the remaining 52,482 of such RSUs will be issued in 2018 after withholding shares to the extent of minimum statutory withholding taxes.
[3]	Vested RSUs were net settled by issuing 199,949 shares (net of minimum statutory tax withholding). 53,546 RSUs vested in the year ended December 31, 2015, 53,023 shares in respect of which were issued in 2017 after withholding shares to the extent of minimum statutory withholding taxes.
[4]	RSUs expected to vest reflect an estimated forfeiture rate.

Summary of Restricted Share 123

Summary of Restricted Share Units Granted (Parenthetical) (Detail) - Restricted Share Units (RSUs) - shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
RSUs settled on vesting by issuing shares (net of minimum tax withholding)		32,395	29,719	199,949
Shares to be issued on vested awards other than options		53,546	86,517		92,692	61,057
Vested in December 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vested RSU issued during the period				53,023
Vested in December 31, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
RSUs settled on vesting by issuing shares (net of minimum tax withholding)		17,802
Vested RSU issued during the period		34,035
Vested in December 31, 2016 | Scenario, Forecast
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vested RSU issued during the period	52,482

Summary of Performance Units Ac

Summary of Performance Units Activity (Detail) - Performance Units - $ / shares		12 Months Ended
		Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015
Number of Performance Units
Outstanding number of shares (Units), beginning balance		3,772,128		2,499,322		1,292,750
Granted, number of shares (Units)		1,811,292		1,518,374		1,375,650
Vested, number of shares (Units)		(1,136,047)	[1]			(855)	[2]
Forfeited, number of shares (Units)		(1,583,913)	[3]	(252,842)		(136,216)
Adjustment upon final determination of level of performance goal achievement		37,480	[4]	7,274	[5]
Adjustment due to achievement of lower than target performance	[6]					(32,007)
Outstanding number of shares (Units), ending balance		2,900,940		3,772,128		2,499,322
Expected to vest, number of shares (Units)	[7]	2,657,685		2,226,489		2,184,906
Weighted Average Grant Date Fair Value
Outstanding weighted average grant date fair value, beginning balance		$ 23.04		$ 19.95		$ 16.78
Granted, weighted average grant date fair value		25.22		27.93		22.72
Vested, weighted average grant date fair value		16.78	[1]			16.78	[2]
Forfeited, weighted average grant date fair value		27.57	[3]	21.88		17.82
Adjustment upon final determination of level of performance goal achievement		25.22	[4]	22.72	[5]
Adjustment due to achievement of lower than maximum performance goals	[6]					20.45
Outstanding weighted average grant date fair value, ending balance		$ 24.40		$ 23.04		$ 19.95
Forfeited, number of shares (Units)				(1,443,624)
Maximum shares eligible to receive
Outstanding maximum shares eligible to receive, beginning balance		5,524,114		2,499,322		2,648,626
Granted, maximum shares eligible to receive		3,622,584		3,343,335		2,965,475
Vested, maximum shares eligible to receive		(1,136,047)	[1]			(855)	[2]
Forfeited, maximum shares eligible to receive		(1,627,313)	[3]	(325,817)		(156,194)
Adjustment upon final determination of level of performance goal achievement		(3,482,398)	[8]	7,274	[5]	2,957,730	[9]
Adjustment due to achievement of lower than maximum performance		3,482,398	[8]	(7,274)	[5]	(2,957,730)	[9]
Outstanding maximum shares eligible to receive, ending balance		2,900,940		5,524,114		2,499,322
[1]	Vested PUs were net settled upon vesting by issuing 731,701 shares (net of minimum statutory tax withholding).
[2]	Vested PUs were net settled upon vesting by issuing 590 shares (net of minimum statutory tax withholding).
[3]	Includes 1,443,624 target shares underlying PUs granted in 2016 which were forfeited for failure to achieve all of the threshold performance targets under such awards as certified by the compensation committee based on the Company’s audited financial statements for the year ended December 31, 2016.
[4]	Represents a 2.7% increase in the number of target shares as a result of achievement of higher-than-target performance for certain PUs granted in 2017, partially offset by a 12.5% reduction as a result of achievement of lower-than-target performance for certain PUs granted in 2017.
[5]	Represents an adjustment made in March 2016 to the number of shares underlying the PUs granted in 2015 upon certification of the level of achievement of the performance targets for such awards.
[6]	Represents a 5.2% to 6.7% reduction, depending on the targets under the PU award granted, in the number of target shares as a result of achievement of lower-than-target performance for the PUs granted in 2015, partially offset by a 0.8% to 6.6% increase in the number of target shares as a result of achievement of higher-than-target performance for the PUs granted in 2014.
[7]	PUs expected to vest are based on the probable achievement of the performance targets after considering an estimated forfeiture rate.
[8]	Represents the difference between the maximum number of shares achievable and the number of shares expected to vest under the PU awards granted in 2017 based on the level of achievement of the performance goals. Also includes the difference between the maximum number of shares achievable and the number of shares eligible to vest under the PU awards granted in 2016, which were forfeited for failure to achieve all of the threshold performance targets under such awards as certified by the compensation committee based on the Company’s audited financial statements for the year ended December 31, 2016.
[9]	Represents the difference between the maximum number of shares achievable and the number of shares expected to vest under the PU awards granted in 2015. Also includes the difference between the maximum number of shares achievable and the number of shares eligible to vest under the PU awards granted in 2014 based on the certified level of achievement of the performance goals.

Summary of Performance Units125

Summary of Performance Units Activity (Parenthetical) (Detail) - shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table]
Net settlement on vesting of performance units, shares	731,701		590
Performance Units
Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table]
Forfeited, number of shares (Units)		1,443,624
Increase due to achievement of higher-than-target performance for grants in 2017, percentage	2.70%
Decrease due to achievement of lower-than-target performance for grants in 2017, percentage	12.50%
Performance Units | Minimum
Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table]
Addition due to achievement of higher than target performance, percentage				0.80%
Reduction due to achievement of lower than target performance, percentage			5.20%
Performance Units | Maximum
Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table]
Addition due to achievement of higher than target performance, percentage				6.60%
Reduction due to achievement of lower than target performance, percentage			6.70%

Capital Stock - Additional Info

Capital Stock - Additional Information (Detail) - USD ($)	Dec. 29, 2017	Dec. 20, 2017	Sep. 21, 2017	Jun. 28, 2017	Mar. 30, 2017	Mar. 28, 2017	Feb. 28, 2017	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Mar. 29, 2017	Feb. 10, 2017
Class Of Stock [Line Items]
Common shares, authorized								500,000,000				500,000,000	500,000,000
Common shares, par value								$ 0.01				$ 0.01	$ 0.01
Preferred shares, authorized								250,000,000				250,000,000	250,000,000
Preferred shares, par value								$ 0.01				$ 0.01	$ 0.01
Common shares, issued								192,825,207				192,825,207	198,794,052
Common shares, outstanding								192,825,207				192,825,207	198,794,052
Preferred shares, issued								0				0	0
Preferred shares, outstanding								0				0	0
Common stock voting right												Holders of common shares are entitled to one vote per share
Stock repurchase authorized amount													$ 750,000,000			$ 1,250,000,000
Additional stock repurchase authorized amount																$ 500,000,000
Shares repurchased and retired (in shares)												808,293	13,940,782
Common stock shares repurchased price per share												$ 24.48	$ 24.76
Aggregate amount of common stock shares repurchased												$ 219,784,000	$ 345,200,000	$ 226,917,000
Expenses related to stock purchases												$ 16,000	$ 279,000	$ 197,000
Quarterly dividend declared							$ 0.06
Annual dividend												$ 0.24
Dividend		$ 11,590,000	$ 11,581,000	$ 11,558,000		$ 11,957,000
Dividends payable, date declared							2017-02
Dividends paid per share		$ 0.06	$ 0.06	$ 0.06		$ 0.06		$ 0.06	$ 0.06	$ 0.06	$ 0.06		$ 0
First Quarter Dividend
Class Of Stock [Line Items]
Dividend payment date							Mar. 28, 2017
Dividends payable, date of record							Mar. 10, 2017
Second Quarter Dividend
Class Of Stock [Line Items]
Dividend payment date							Jun. 28, 2017
Dividends payable, date of record							Jun. 12, 2017
Third Quarter Dividend
Class Of Stock [Line Items]
Dividend payment date							Sep. 21, 2017
Dividends payable, date of record							Sep. 8, 2017
Fourth Quarter Dividend
Class Of Stock [Line Items]
Dividend payment date							Dec. 20, 2017
Dividends payable, date of record							Dec. 8, 2017
Accelerated Share Repurchase Agreement
Class Of Stock [Line Items]
Aggregate purchase price of common shares															$ 200,000,000
Initial delivery of common shares received					6,578,947
Additional delivery of common shares received	350,006
Delivery of common shares received, shares	6,928,953
Delivery of common shares received, amount	$ 196,000,000
Delivery of weighted average price per share of common shares	$ 28.29
Accelerated Share Repurchase Agreement | Additional Paid- in Capital
Class Of Stock [Line Items]
Reduction to shareowners' equity												$ 4,000,000
Share Repurchase Open Market
Class Of Stock [Line Items]
Aggregate amount of common stock shares repurchased												$ 19,784,000	$ 345,200,000

Earnings Per Share - Additional

Earnings Per Share - Additional Information (Detail) - shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share [Abstract]
Number of stock awards outstanding but not included in the computation of diluted earnings per common share	1,007,480	781,215	2,821,000

Earnings Per Share (Detail)

Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share (Abstract)
Net income available to Genpact Limited common shareholders									$ 263,111	$ 269,684	$ 239,817
Weighted average number of common shares used in computing basic earnings per common share	192,795,534	192,124,366	191,469,593	199,069,528	200,341,922	206,146,007	210,178,050	210,780,165	193,864,755	206,861,536	216,606,542
Dilutive effect of stock-based awards									3,184,797	3,264,487	2,538,502
Weighted average number of common shares used in computing dilutive earnings per common share	196,862,168	194,947,699	193,732,406	202,655,937	203,431,310	209,376,683	213,803,134	213,892,964	197,049,552	210,126,023	219,145,044
Basic	$ 0.35	$ 0.38	$ 0.36	$ 0.27	$ 0.38	$ 0.33	$ 0.31	$ 0.28	$ 1.36	$ 1.30	$ 1.11
Diluted	$ 0.34	$ 0.38	$ 0.36	$ 0.26	$ 0.38	$ 0.33	$ 0.31	$ 0.27	$ 1.34	$ 1.28	$ 1.09

Cost of Revenue (Detail)

Cost of Revenue (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Component Of Operating Other Cost And Expense [Line Items]
Cost of revenue	$ 1,683,704	$ 1,554,707	$ 1,493,547
Personnel expenses
Component Of Operating Other Cost And Expense [Line Items]
Cost of revenue	1,155,745	1,061,501	1,013,209
Operational expenses
Component Of Operating Other Cost And Expense [Line Items]
Cost of revenue	481,012	446,922	432,535
Depreciation and amortization
Component Of Operating Other Cost And Expense [Line Items]
Cost of revenue	$ 46,947	$ 46,284	$ 47,803

Selling, General and Adminis130

Selling, General and Administrative Expenses (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Component Of Operating Other Cost And Expense [Line Items]
Selling, general and administrative expenses	$ 689,847	$ 653,029	$ 608,114
Personnel expenses
Component Of Operating Other Cost And Expense [Line Items]
Selling, general and administrative expenses	501,445	469,956	430,088
Operational expenses
Component Of Operating Other Cost And Expense [Line Items]
Selling, general and administrative expenses	178,573	174,060	169,042
Depreciation and amortization
Component Of Operating Other Cost And Expense [Line Items]
Selling, general and administrative expenses	$ 9,829	$ 9,013	$ 8,984

Other Operating Income (Expense

Other Operating Income (Expense), Net (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other Income And Expenses [Abstract]
Other operating (income) expense	$ (7,277)	$ (1,266)	$ (2,515)
Provision for impairment of intangible assets and property, plant and equipment	9,311	11,195	10,714
Change in fair value of earn-out consideration and deferred consideration (relating to business acquisitions)	(3,695)	(14,869)	(11,521)
Other operating (income) expense, net	$ (1,661)	$ (4,940)	$ (3,322)

Interest Income (Expense), N132

Interest Income (Expense), Net (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other Income And Expenses [Abstract]
Interest income	$ 8,182	$ 7,247	$ 8,676
Interest expense	(39,917)	(23,431)	(29,828)
Loss on extinguishment of debt			(10,115)
Interest income (expense), net	$ (31,735)	$ (16,184)	$ (31,267)

Income Tax Expense (Benefit) (D

Income Tax Expense (Benefit) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Income tax expense	$ 59,742	$ 62,098	$ 61,937
Other comprehensive Income:
Unrealized gains (losses) on cash flow hedges	457	23,809	13,816
Retirement benefits	670	(1,885)	1,304
Excess tax benefit on stock-based compensation	$ 0	0	$ (6,560)
Deferred tax assets recognized on early adoption of ASU 2016-09		$ (24,912)

Components of Income before Inc

Components of Income before Income Tax Expense from Continuing Operations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Domestic (U.S.)	$ 8,440	$ 44,110	$ 23,122
Foreign (Non-U.S.)	312,143	285,535	278,632
Income before income tax expense	$ 320,583	$ 329,645	$ 301,754

Income Tax Expense (Benefit) At

Income Tax Expense (Benefit) Attributable to Income from Continuing Operations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current taxes:
Domestic (U.S. federal taxes)	$ 3,380	$ 78	$ 12,142
Domestic (U.S. state taxes)	1,268	1,069	301
Foreign (Non-U.S.)	65,485	30,497	68,207
Current Income Tax Expense (Benefit), Total	70,133	31,644	80,650
Deferred taxes:
Domestic (U.S. federal taxes)	3,549	11,379	(5,396)
Domestic (U.S. state taxes)	(2,809)	(459)	344
Foreign (Non-U.S.)	(11,131)	19,534	(13,661)
Deferred Income Tax Expense (Benefit), Total	(10,391)	30,454	(18,713)
Total income tax expense (benefit)	$ 59,742	$ 62,098	$ 61,937

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017USD ($)Unit$ / shares	Dec. 31, 2016USD ($)$ / shares	Dec. 31, 2015USD ($)$ / shares	Dec. 31, 2014USD ($)
Income Tax Disclosure [Line Items]
Statutory tax rates		35.00%	35.00%	35.00%
Number of Special Economic Zone units held by Indian subsidiary eligible for tax holiday | Unit		16
Excess tax benefits relating to exercise of stock awards recorded through retained earnings			$ 24,912,000
Excess tax benefit on stock-based Compensation		$ 0	0	$ 6,560,000
Net operating loss carryforwards		223,415,000
Deferred tax assets related to net operating loss carryforwards, excluding state		50,495,000
Net operating loss of subsidiary, carried forward		126,612,000
Additional deferred tax assets for U.S. state and local tax loss carry-forwards		$ 5,005,000
Operating loss carry-forwards, expiration date, range start		2,018
Operating loss carry-forwards, expiration date, range end		2,036
Tax credit carry forward			33,220,000
Undistributed earnings of foreign subsidiaries (non-Bermuda)		$ 36,029,000
Deferred tax liability has not been recognized for undistributed earnings of foreign subsidiaries (non-Bermuda)		0
Cash and cash equivalents held by foreign (non-Bermuda) subsidiaries		499,532,000
Cash and cash equivalents		504,468,000	422,623,000	450,907,000	$ 461,788,000
Cash held by foreign subsidiary		243,813,000
Cash and cash equivalents held by foreign (non-Bermuda) subsidiaries for which no tax will accrue on repatriation of retained earnings		122,674,000
Cash and cash equivalents held by foreign subsidiaries		133,045,000
Net tax expense in net deferred tax asset		$ 3,182,000
Percentage of claim on depreciation		100.00%
Investments in depreciable property		$ 7,685,000
Tax liability for transition tax		0
Unrecognized tax benefits that would impact effective tax rate		24,877,000	22,469,000	24,935,000
Unrecognized tax benefits, interest on income taxes accrued		4,614,000	3,856,000	4,223,000
Unrecognized tax benefits, excluding exchange rate differences for interest recognized			(224,000)	(206,000)	$ 1,152,000
Accrued penalties		1,033,000	977,000	$ 958,000
Scenario, Forecast
Income Tax Disclosure [Line Items]
Statutory tax rates	21.00%
Retained Earnings
Income Tax Disclosure [Line Items]
Repatriation of retained earnings		17,343,000
Foreign Tax Authority
Income Tax Disclosure [Line Items]
Tax credit carry forward		33,220,000
Early Adoption of ASU 2016-09
Income Tax Disclosure [Line Items]
Excess tax benefits relating to exercise of stock awards recorded through retained earnings			24,912,000
Income tax expense attributable to continuing operations		$ 1,723,000	1,004,000
Foreign Subsidiary
Income Tax Disclosure [Line Items]
Operating loss carryforwards reversal of remaining valuation allowance			$ 3,377,000
Minimum
Income Tax Disclosure [Line Items]
Tax holiday, expiring date		March 31, 2022
Maximum
Income Tax Disclosure [Line Items]
Tax holiday, expiring date		March 31, 2029
Tax Holiday For First 5 Years
Income Tax Disclosure [Line Items]
Tax holiday, period, in years		5 years
Percentage of tax holiday in respect to export profits		100.00%
Tax Holiday from year 6 to year 10
Income Tax Disclosure [Line Items]
Tax holiday, period, in years		5 years
Percentage of tax holiday in respect to export profits		50.00%
Tax Holiday from year 11 to year 15
Income Tax Disclosure [Line Items]
Tax holiday, period, in years		5 years
Percentage of tax holiday in respect to export profits		50.00%
Basic Earnings Per Share
Income Tax Disclosure [Line Items]
Earnings per share effect of tax holiday | $ / shares		$ 0.18	$ 0.19	$ 0.18
Diluted Earnings Per Share
Income Tax Disclosure [Line Items]
Earnings per share effect of tax holiday | $ / shares		$ 0.18	$ 0.18	$ 0.17

Income Tax Expense (Benefit) Co

Income Tax Expense (Benefit) Computed by Applying United States Federal Statutory Income Tax Rate to Income Before Income Taxes (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Income before income tax expense		$ 320,583	$ 329,645	$ 301,754
Statutory tax rates		35.00%	35.00%	35.00%
Computed expected income tax expense		$ 112,204	$ 115,376	$ 105,614
Increase (decrease) in income taxes resulting from:
Foreign tax rate differential		(25,224)	(18,574)	(16,550)
Tax benefit from tax holiday		(35,814)	(32,893)	(38,039)
Non-deductible expenses		1,146	2,295	1,884
Effect of change in tax rates		2,778	353	1,436
Change in valuation allowance		9,041	(4,830)	(33)
Unrecognized tax benefits		1,611	(627)	6,272
Other	[1]	(6,000)	998	1,353
Total income tax expense (benefit)		$ 59,742	$ 62,098	$ 61,937
[1]	During 2017, following the transfer/closure of certain affiliated entities, deferred tax liabilities recorded against the outside basis difference amounting to $9,600 were reversed. It was not more likely than not that the resulting net deferred tax asset would be realized. Therefore, a full valuation allowance was established to offset the reduction in deferred tax liabilities.

Income Tax Expense (Benefit)138

Income Tax Expense (Benefit) Computed by Applying United States Federal Statutory Income Tax Rate to Income Before Income Taxes (Parenthetical) (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)
Income Tax Disclosure [Abstract]
Reversal of deferred tax liabilities due to transfer/closure of certain affiliated entities	$ 9,600

Components of Deferred Tax Bala

Components of Deferred Tax Balances (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets
Net operating loss carryforwards	$ 55,500	$ 52,997
Accrued liabilities and other expenses	41,177	19,840
Provision for doubtful debts	10,509	6,419
Property, plant and equipment	1,270	3,445
Unrealized losses on cash flow hedges, Net	275	558
Share-based compensation	19,789	19,054
Retirement benefits	5,817	5,067
Deferred revenue	22,948	44,892
Tax credit carryforwards	35,322	34,509
Other	11,571	8,876
Gross deferred tax assets	204,178	195,657
Less: valuation allowance	(24,549)	(14,746)	$ (20,091)	$ (21,094)
Total deferred tax assets	179,629	180,911
Deferred tax assets	76,929	70,143
Deferred tax liabilities
Intangible assets	15,954	13,519
Property, plant and equipment	1,131	2,745
Deferred cost	33,816	41,950
Investments in foreign subsidiaries not indefinitely reinvested	18,949	29,546
Unrealized gains on cash flow hedges, net	14,711	14,350
Other	24,886	11,073
Total deferred tax liabilities	109,447	113,183
Deferred tax liabilities	6,747	2,415
Net deferred tax asset	$ 70,182	$ 67,728

Change in Total Valuation Allow

Change in Total Valuation Allowance for Deferred Tax Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Opening valuation allowance	$ 14,746	$ 20,091	$ 21,094
Reduction during the year	(3,957)	(7,299)	(3,499)
Addition during the year	13,760	1,954	2,496
Closing valuation allowance	$ 24,549	$ 14,746	$ 20,091

Remaining Tax Loss Carry Forwar

Remaining Tax Loss Carry Forwards Expiration (Detail) $ in Thousands	Dec. 31, 2017USD ($)
US - Federal
Operating Loss Carryforwards [Line Items]
Tax loss carry forwards subject to expiration	$ 19,424
US - Federal | 2026
Operating Loss Carryforwards [Line Items]
Tax loss carry forwards subject to expiration	9,511
US - Federal | 2027
Operating Loss Carryforwards [Line Items]
Tax loss carry forwards subject to expiration	9,913
Europe
Operating Loss Carryforwards [Line Items]
Tax loss carry forwards subject to expiration	47,937
Europe | 2020
Operating Loss Carryforwards [Line Items]
Tax loss carry forwards subject to expiration	1,872
Europe | 2021
Operating Loss Carryforwards [Line Items]
Tax loss carry forwards subject to expiration	581
Europe | 2022
Operating Loss Carryforwards [Line Items]
Tax loss carry forwards subject to expiration	5,253
Europe | 2023
Operating Loss Carryforwards [Line Items]
Tax loss carry forwards subject to expiration	8,500
Europe | 2024
Operating Loss Carryforwards [Line Items]
Tax loss carry forwards subject to expiration	1,213
Europe | 2025
Operating Loss Carryforwards [Line Items]
Tax loss carry forwards subject to expiration	28,222
Europe | 2026
Operating Loss Carryforwards [Line Items]
Tax loss carry forwards subject to expiration	2,263
Europe | 2028
Operating Loss Carryforwards [Line Items]
Tax loss carry forwards subject to expiration	33
Others
Operating Loss Carryforwards [Line Items]
Tax loss carry forwards subject to expiration	29,442
Others | 2018
Operating Loss Carryforwards [Line Items]
Tax loss carry forwards subject to expiration	20
Others | 2019
Operating Loss Carryforwards [Line Items]
Tax loss carry forwards subject to expiration	72
Others | 2020
Operating Loss Carryforwards [Line Items]
Tax loss carry forwards subject to expiration	62
Others | 2021
Operating Loss Carryforwards [Line Items]
Tax loss carry forwards subject to expiration	2,084
Others | 2022
Operating Loss Carryforwards [Line Items]
Tax loss carry forwards subject to expiration	60
Others | 2023
Operating Loss Carryforwards [Line Items]
Tax loss carry forwards subject to expiration	953
Others | 2024
Operating Loss Carryforwards [Line Items]
Tax loss carry forwards subject to expiration	7,941
Others | 2025
Operating Loss Carryforwards [Line Items]
Tax loss carry forwards subject to expiration	9,647
Others | 2026
Operating Loss Carryforwards [Line Items]
Tax loss carry forwards subject to expiration	3,072
Others | 2027
Operating Loss Carryforwards [Line Items]
Tax loss carry forwards subject to expiration	2,053
Others | 2028
Operating Loss Carryforwards [Line Items]
Tax loss carry forwards subject to expiration	2,451
Others | 2034
Operating Loss Carryforwards [Line Items]
Tax loss carry forwards subject to expiration	$ 1,027

Foreign Tax Credit Expiry Perio

Foreign Tax Credit Expiry Period (Detail) $ in Thousands	Dec. 31, 2016USD ($)
Tax Credit Carryforward [Line Items]
Foreign tax credit carryforward amount	$ 33,220
2,023
Tax Credit Carryforward [Line Items]
Foreign tax credit carryforward amount	893
2,024
Tax Credit Carryforward [Line Items]
Foreign tax credit carryforward amount	1,202
2,025
Tax Credit Carryforward [Line Items]
Foreign tax credit carryforward amount	15,552
2,026
Tax Credit Carryforward [Line Items]
Foreign tax credit carryforward amount	8,481
2,027
Tax Credit Carryforward [Line Items]
Foreign tax credit carryforward amount	5,362
2,028
Tax Credit Carryforward [Line Items]
Foreign tax credit carryforward amount	$ 1,730

Activities Related to Unrecogni

Activities Related to Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Uncertainties [Abstract]
Beginning balance	$ 23,467	$ 26,357	$ 22,718
Increase related to prior year tax positions, including recorded in acquisition accounting	2,582	370	2,000
Decrease related to prior year tax positions	(1,398)	(1,506)
Decrease related to divestiture of business		(345)
Decrease related to prior year tax position due to lapse of applicable statute of limitation	(1,019)	(2,122)	(820)
Increase related to current year tax positions, including recorded in acquisition accounting	1,661	3,225	3,544
Decrease related to settlements with tax Authorities		(2,000)
Effect of exchange rate changes	767	(512)	(1,085)
Ending balance	$ 26,060	$ 23,467	$ 26,357

Net Revenues for Service Type (

Net Revenues for Service Type (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Total net revenues	$ 734,413	$ 708,824	$ 670,697	$ 622,995	$ 681,747	$ 648,783	$ 630,523	$ 609,703	$ 2,736,929	$ 2,570,756	$ 2,461,044
Business process outsourcing
Segment Reporting Information [Line Items]
Total net revenues									2,264,335	2,083,450	1,933,095
IT Services
Segment Reporting Information [Line Items]
Total net revenues									$ 472,594	$ 487,306	$ 527,949

Revenues from Clients Based on

Revenues from Clients Based on Industry Serviced (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Total net revenues	$ 734,413	$ 708,824	$ 670,697	$ 622,995	$ 681,747	$ 648,783	$ 630,523	$ 609,703	$ 2,736,929	$ 2,570,756	$ 2,461,044
Banking, financial services and insurance
Segment Reporting Information [Line Items]
Total net revenues									1,105,731	1,055,704	1,030,584
Manufacturing including pharmaceuticals and medical equipment manufacturing
Segment Reporting Information [Line Items]
Total net revenues									1,002,973	958,779	878,570
Technology, healthcare and other services
Segment Reporting Information [Line Items]
Total net revenues									$ 628,225	$ 556,273	$ 551,890

Net Revenues from Geographic Ar

Net Revenues from Geographic Areas Based on Location of Service Delivery Centers (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Total net revenues	$ 734,413	$ 708,824	$ 670,697	$ 622,995	$ 681,747	$ 648,783	$ 630,523	$ 609,703	$ 2,736,929	$ 2,570,756	$ 2,461,044
India
Segment Reporting Information [Line Items]
Total net revenues									1,712,783	1,804,113	1,687,699
Asia, other than India
Segment Reporting Information [Line Items]
Total net revenues									286,338	249,839	238,529
Americas
Segment Reporting Information [Line Items]
Total net revenues									455,059	282,434	304,879
Europe
Segment Reporting Information [Line Items]
Total net revenues									$ 282,749	$ 234,370	$ 229,937

Segment Reporting - Additional

Segment Reporting - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Disclosure [Line Items]
Percentage of consolidated revenue not exceeded by any customer	10.00%	10.00%	10.00%
General Electric Company
Segment Reporting Disclosure [Line Items]
Percentage of revenues	10.00%	14.00%	19.00%

Property, Plant and Equipmen148

Property, Plant and Equipment, Net by Geographic Areas (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Revenues From External Customers And Long Lived Assets [Line Items]
Property, plant and equipment, net	$ 207,030	$ 193,218
India
Revenues From External Customers And Long Lived Assets [Line Items]
Property, plant and equipment, net	125,490	116,417
Asia, other than India
Revenues From External Customers And Long Lived Assets [Line Items]
Property, plant and equipment, net	15,899	13,549
Americas
Revenues From External Customers And Long Lived Assets [Line Items]
Property, plant and equipment, net	38,438	44,633
Europe
Revenues From External Customers And Long Lived Assets [Line Items]
Property, plant and equipment, net	$ 27,203	$ 18,619

Related Party Transactions - Ad

Related Party Transactions - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Related Party Transaction [Line Items]
Investment in equity affiliates	$ 886	$ 4,800
Affiliate of Significant Shareholder
Related Party Transaction [Line Items]
Recognized net revenues	398	335	$ 326
Non-Consolidating Affiliates
Related Party Transaction [Line Items]
Recognized net revenues	5,400	8,077	7,826
Cost of revenue	2,043	2,067	2,173
Selling, general and administrative expenses, net of recovery	315	291	384
Investment in equity affiliates	496	5,884
Charges to equity-method investment	2,849
Investment in equity affiliates	886	4,800
Cost reimbursements from non-consolidating affiliates	477	1,162	2,077
Reimbursements receivable	127
Non-Consolidating Affiliates | U.K.
Related Party Transaction [Line Items]
Payment for affiliate under tax sharing arrangement	3,847
Significant Shareholder of Company
Related Party Transaction [Line Items]
Selling, general and administrative expenses, net of recovery	57	$ 58	$ 421
Cost reimbursements from non-consolidating affiliates	127
Claim on Net Operating Losses under Consortium Relief | U.K. | Other Liabilities
Related Party Transaction [Line Items]
Claimed portion of net operating losses, outstanding	$ 3,291

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Commitments And Contingencies [Line Items]
Bank guarantees, outstanding	$ 8,879	$ 11,958
Capital Addition Purchase Commitments
Commitments And Contingencies [Line Items]
Commitments and contingencies	$ 8,314	$ 5,185

Quarterly Financial Data (Detai

Quarterly Financial Data (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Total net revenues	$ 734,413	$ 708,824	$ 670,697	$ 622,995	$ 681,747	$ 648,783	$ 630,523	$ 609,703	$ 2,736,929	$ 2,570,756	$ 2,461,044
Gross profit	278,530	279,633	255,404	239,658	276,075	256,351	246,768	236,855	1,053,225	1,016,049	967,497
Income from operations	72,049	97,451	80,031	79,096	98,092	87,124	79,940	75,622	328,627	340,777	334,192
Income before equity method investment activity, net and income tax expense	81,559	89,742	84,582	69,243	95,502	87,360	81,818	72,664	325,126	337,343	312,554
Net Income	66,138	73,161	69,102	52,440	76,066	68,188	64,788	58,505	260,841	267,547	239,817
Net loss attributable to redeemable non-controlling interest	944	584	(156)	898	232	734	882	289	2,270	2,137
Net income attributable to Genpact Limited shareholders	$ 67,082	$ 73,745	$ 68,946	$ 53,338	$ 76,298	$ 68,922	$ 65,670	$ 58,794	$ 263,111	$ 269,684	$ 239,817
Earnings per common share attributable to Genpact Limited common shareholders
Basic	$ 0.35	$ 0.38	$ 0.36	$ 0.27	$ 0.38	$ 0.33	$ 0.31	$ 0.28	$ 1.36	$ 1.30	$ 1.11
Diluted	$ 0.34	$ 0.38	$ 0.36	$ 0.26	$ 0.38	$ 0.33	$ 0.31	$ 0.27	$ 1.34	$ 1.28	$ 1.09
Weighted average number of common shares used in computing earnings per common share attributable to Genpact Limited common shareholders
Basic	192,795,534	192,124,366	191,469,593	199,069,528	200,341,922	206,146,007	210,178,050	210,780,165	193,864,755	206,861,536	216,606,542
Diluted	196,862,168	194,947,699	193,732,406	202,655,937	203,431,310	209,376,683	213,803,134	213,892,964	197,049,552	210,126,023	219,145,044

Subsequent Events - Additional

Subsequent Events - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	Feb. 12, 2018	Jan. 12, 2018	Feb. 28, 2017	Mar. 01, 2018	Jan. 12, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Subsequent Event [Line Items]
Shares repurchased and retired (in shares)						808,293	13,940,782
Common stock shares repurchased price per share						$ 24.48	$ 24.76
Aggregate amount of common stock shares repurchased						$ 219,784	$ 345,200	$ 226,917
Planned annual dividend			$ 0.24
Quarterly dividend declared			$ 0.06
Share Repurchase Open Market
Subsequent Event [Line Items]
Aggregate amount of common stock shares repurchased						$ 19,784	$ 345,200
Subsequent Event
Subsequent Event [Line Items]
Shares repurchased and retired (in shares)				757,526
Common stock shares repurchased price per share				$ 31.67
Quarterly dividend declared, date	Feb. 12, 2018
Dividends declared per common share, percentage	25.00%
Planned annual dividend	$ 0.30
Quarterly dividend declared	$ 0.075
Dividend payment date	Mar. 21, 2018
Dividends payable, date of record	Mar. 9, 2018
Subsequent Event | Share Repurchase Open Market
Subsequent Event [Line Items]
Aggregate amount of common stock shares repurchased				$ 23,993
Subsequent Event | Accelerated Share Repurchase Agreement
Subsequent Event [Line Items]
Shares repurchased and retired (in shares)		163,975			7,092,928
Common stock shares repurchased price per share		$ 28.20
Aggregate amount of common stock shares repurchased					$ 200,000