ExlService (EXLS) 10-Q 27 Oct 16 2016 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2016	Oct. 25, 2016
Document And Entity Information [Abstract]
Entity Registrant Name	ExlService Holdings, Inc.
Entity Central Index Key	1,297,989
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Sep. 30, 2016
Document Fiscal Year Focus	2,016
Trading Symbol	EXLS
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Common Stock, Shares Outstanding		33,507,211

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 98,374	$ 205,323
Short-term investments	115,637	13,676
Restricted cash	2,256	1,872
Accounts receivable, net	109,086	92,650
Prepaid expenses	6,802	8,027
Advance income tax, net	7,110	2,432
Other current assets	18,716	15,219
Total current assets	357,981	339,199
Fixed assets, net	49,006	47,991
Restricted cash	3,380	3,319
Deferred tax assets, net	7,073	13,749
Intangible assets, net	50,326	52,733
Goodwill	177,093	171,535
Other assets	24,163	22,257
Total assets	669,022	650,783
Current liabilities:
Accounts payable	3,395	6,401
Short-term borrowings	5,000	10,000
Deferred revenue	9,730	11,518
Accrued employee cost	40,660	44,526
Accrued expenses and other current liabilities	38,362	34,250
Current portion of capital lease obligations	237	384
Total current liabilities	97,384	107,079
Long term borrowings	40,000	60,000
Capital lease obligations, less current portion	214	278
Non-current liabilities	13,205	17,655
Total liabilities	150,803	185,012
Commitments and contingencies (See Note 16)
Preferred stock, $0.001 par value; 15,000,000 shares authorized, none issued	0	0
Stockholders’ equity:
Common stock, $0.001 par value; 100,000,000 shares authorized, 35,532,329 shares issued and 33,523,371 shares outstanding as of September 30, 2016 and 34,781,201 shares issued and 33,091,223 shares outstanding as of December 31, 2015	36	35
Additional paid-in-capital	275,020	254,052
Retained earnings	367,234	320,989
Accumulated other comprehensive loss	(66,924)	(67,325)
Total including shares held in treasury	575,366	507,751
Less: 2,008,958 shares as of September 30, 2016 and 1,689,978 shares as of December 31, 2015, held in treasury, at cost	(57,328)	(42,159)
ExlService Holdings, Inc. stockholders’ equity	518,038	465,592
Non-controlling interest	181	179
Total equity	518,219	465,771
Total liabilities and equity	$ 669,022	$ 650,783

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Sep. 30, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	15,000,000	15,000,000
Preferred stock, shares issued (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	35,532,329	34,781,201
Common stock, shares outstanding (in shares)	33,523,371	33,091,223
Treasury stock (in shares)	2,008,958	1,689,978

Unaudited Consolidated Statemen

Unaudited Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Statement [Abstract]
Revenues, net	$ 171,200	$ 163,503	$ 508,714	$ 462,634
Cost of revenues (exclusive of depreciation and amortization)	111,767	103,198	332,172	296,801
Gross profit	59,433	60,305	176,542	165,833
Operating expenses:
General and administrative expenses	21,854	18,817	63,620	57,428
Selling and marketing expenses	11,623	12,682	37,875	35,769
Depreciation and amortization	8,597	8,057	25,000	23,171
Total operating expenses	42,074	39,556	126,495	116,368
Income from operations	17,359	20,749	50,047	49,465
Other income/(expense) :
Foreign exchange gain	1,741	191	3,573	2,347
Other income, net	2,596	1,787	11,174	4,300
Income before income taxes	21,696	22,727	64,794	56,112
Income tax expense	5,646	7,565	18,549	19,309
Net income	$ 16,050	$ 15,162	$ 46,245	$ 36,803
Earnings per share:
Basic (in dollars per share)	$ 0.48	$ 0.46	$ 1.38	$ 1.10
Diluted (in dollars per share)	$ 0.46	$ 0.44	$ 1.34	$ 1.08
Weighted-average number of shares used in computing earnings per share:
Basic weighted average common shares outstanding (in shares)	33,624,401	33,307,312	33,542,258	33,320,477
Diluted weighted average common shares outstanding (in shares)	34,675,485	34,180,635	34,512,815	34,147,120

Unaudited Consolidated Stateme5

Unaudited Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income		$ 16,050	$ 15,162	$ 46,245	$ 36,803
Other comprehensive income/(loss):
Unrealized gain/(loss) on effective cash flow hedges, net of taxes $1,067, ($822), $1,094 and ($727), respectively		2,540	(2,704)	3,066	(2,014)
Foreign currency translation adjustment		1,716	(7,092)	(2,652)	(9,926)
Retirement benefits, net of taxes $4, $71, $24 and $81, respectively		104	172	409	501
Reclassification adjustments
Realized (gain)/loss on cash flow hedges, net of taxes ($205), $175, ($386) and $393, respectively	[1]	(261)	255	(486)	570
Retirement benefits, net of taxes $1, $15, $3 and $31, respectively	[2]	22	36	64	128
Total other comprehensive income		4,121	(9,333)	401	(10,741)
Total comprehensive income		$ 20,171	$ 5,829	$ 46,646	$ 26,062
[1]	These are reclassified to net income and are included in the foreign exchange gain/(loss) in the unaudited consolidated statements of income. See Note 7 to the unaudited consolidated financial statements.
[2]	These are reclassified to net income and are included in the computation of net periodic pension costs in the unaudited consolidated statements of income. See Note 11 to the unaudited consolidated financial statements.

Unaudited Consolidated Stateme6

Unaudited Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Unrealized gain/(loss) on effective cash flow hedges, taxes	$ 1,067	$ (822)	$ 1,094	$ (727)
Retirement benefits, taxes	4	71	24	81
Realized loss on cash flow hedges, taxes	(205)	175	(386)	393
Retirement benefits, taxes	$ 1	$ 15	$ 3	$ 31

Unaudited Consolidated Stateme7

Unaudited Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash flows from operating activities:
Net income	$ 46,245	$ 36,803
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	25,000	23,171
Stock-based compensation expense	14,743	12,280
Unrealized gain on short term investments	(4,955)	(2,179)
Unrealized foreign exchange gain	(147)	(2,850)
Deferred income taxes	4,424	3,596
Change in fair value of earn-out consideration	(4,060)	0
Others, net	(84)	(249)
Change in operating assets and liabilities (net of effect of acquisitions):
Restricted cash	(464)	(1,313)
Accounts receivable	(16,522)	(14,647)
Prepaid expenses and other current assets	(587)	977
Accounts payable	(2,518)	(1,602)
Deferred revenue	(1,485)	(915)
Accrued employee costs	(3,812)	460
Accrued expenses and other liabilities	5,688	(3,973)
Advance income tax, net	(4,748)	5,751
Other assets	(676)	(760)
Net cash provided by operating activities	56,042	54,550
Cash flows from investing activities:
Purchase of fixed assets	(20,335)	(21,127)
Business acquisition (net of cash acquired)	(9,427)	(44,270)
Purchase of short-term investments	(155,709)	(109,162)
Proceeds from redemption of short-term investments	59,229	28,640
Net cash used for investing activities	(126,242)	(145,919)
Cash flows from financing activities:
Principal payments on capital lease obligations	(292)	(559)
Proceeds from borrowings	0	30,000
Repayments of borrowings	(25,000)	(10,000)
Payment of debt issuance costs	0	(74)
Acquisition of treasury stock	(15,169)	(13,015)
Proceeds from exercise of stock options	6,226	3,162
Net cash (used)/provided by financing activities	(34,235)	9,514
Effect of exchange rate changes on cash and cash equivalents	(2,514)	(3,988)
Net decrease in cash and cash equivalents	(106,949)	(85,843)
Cash and cash equivalents, beginning of period	205,323	176,499
Cash and cash equivalents, end of period	$ 98,374	$ 90,656

Organization and Basis of Prese

Organization and Basis of Presentation	9 Months Ended
	Sep. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Basis of Presentation	Organization and Basis of Presentation Organization ExlService Holdings, Inc. (“ExlService Holdings”) is organized as a corporation under the laws of the state of Delaware. ExlService Holdings, together with its subsidiaries (collectively, the “Company”), is a leading Operations Management and Analytics company that helps businesses enhance growth and profitability. Using its proprietary platforms, methodologies and tools the Company looks deeper to help companies improve global operations, enhance data-driven insights, increase customer satisfaction, and manage risk and compliance. The Company’s clients are located principally in the U.S. and the U.K. Basis of Presentation The unaudited interim consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“US GAAP”) for interim financial information, the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by US GAAP for annual financial statements and therefore should be read in conjunction with the audited consolidated financial statements and footnotes thereto included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2015. The unaudited interim consolidated financial statements reflect all adjustments (of a normal and recurring nature) that management considers necessary for a fair presentation of such statements for the interim periods presented. The unaudited consolidated statements of income for the interim periods presented are not necessarily indicative of the results for the full year or for any subsequent period. Effective for the quarter and year ended December 31, 2015, the Company merged two of its operating segments (Operations Consulting and Finance Transformation, previously part of the Analytics and Business Transformation reportable segment) into the Consulting operating segment to reflect recent organizational changes. The Company has also revised its reportable segments to reflect management’s focus on the Analytics operating segment. All other operating segments have been aggregated into the Operations Management reportable segment. The Company’s reportable segments are as follows: • Operations Management, and • Analytics The segment information for all prior periods presented herein has been restated to conform to the current presentation. This change in segment presentation does not affect the Company’s consolidated statements of income, comprehensive income, balance sheets or statements of cash flows.

Summary of Significant Accounti

Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2016
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies (a) Principles of Consolidation The accompanying unaudited consolidated financial statements include the financial statements of ExlService Holdings and all of its subsidiaries. All intercompany balances and transactions have been eliminated in consolidation. The non-controlling interest represents the minority partner’s interest in the operations of ExlService Colombia S.A.S. ("Exl Colombia") and the profits associated with the minority partner’s interest in those operations, in the consolidated balance sheets and consolidated statements of income, respectively. The non-controlling interests in such operations for all the periods presented were insignificant and are included under general and administrative expenses in the unaudited consolidated statements of income. (b) Use of Estimates The preparation of the unaudited consolidated financial statements in conformity with US GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the unaudited consolidated financial statements and the unaudited consolidated statements of income during the reporting period. Although these estimates are based on management’s best assessment of the current business environment, actual results may be different from those estimates. The significant estimates and assumptions that affect the financial statements include, but are not limited to, allowance for doubtful receivables, service tax receivables, assets and obligations related to employee benefit plans, deferred tax valuation allowances, income-tax uncertainties and other contingencies, valuation of derivative financial instruments, stock-based compensation expense, depreciation and amortization periods, purchase price allocation, recoverability of long-term assets including goodwill and intangibles, and estimates to complete the fixed price contracts. (c) Other current assets Other current assets consists of the following: September 30, 2016 December 31, 2015 Derivative instruments $ 4,245 $ 3,009 Advances to suppliers 1,366 1,545 Receivables from statutory authorities 11,073 8,676 Others 2,032 1,989 Other current assets $ 18,716 $ 15,219 (d) Accrued expenses and other current liabilities Accrued expenses and other current liabilities consists of the following: September 30, 2016 December 31, 2015 Accrued expenses $ 27,356 $ 26,238 Derivative instruments 1,097 1,226 Client liability 2,515 2,217 Other current liabilities 7,394 4,569 Accrued expenses and other current liabilities $ 38,362 $ 34,250 (e) Non-current liabilities Non-current liabilities consists of the following: September 30, 2016 December 31, 2015 Derivative instruments $ 719 $ 1,132 Unrecognized tax benefits 3,195 3,066 Deferred rent 6,308 6,515 Retirement benefits 1,398 1,441 Other non-current liabilities 1,585 5,501 Non-current liabilities $ 13,205 $ 17,655 (f) Accumulated Other Comprehensive Loss Accumulated other comprehensive loss consists of amortization of actuarial gain/(loss) on retirement benefits and changes in the cumulative foreign currency translation adjustments. In addition, the Company enters into foreign currency exchange contracts, which are designated as cash flow hedges in accordance with ASC topic 815, "Derivatives and Hedging" ("ASC 815"). Changes in the fair values of contracts that are deemed effective are recorded as a component of accumulated other comprehensive loss until the settlement of those contracts. The balances as of September 30, 2016 and December 31, 2015 are as follows: September 30, 2016 December 31, 2015 Cumulative currency translation adjustments $ (70,715 ) $ (68,063 ) Unrealized gain on cash flow hedges, net of taxes of $1,370 and $662 3,404 824 Retirement benefits, net of taxes of ($174) and ($201) 387 (86 ) Accumulated other comprehensive loss $ (66,924 ) $ (67,325 ) (g) Other Income, net Other income, net consists of the following: Three months ended September 30, Nine months ended September 30, 2016 2015 2016 2015 Interest and dividend income* $ 2,916 $ 2,085 $ 7,399 $ 4,997 Interest expense (295 ) (340 ) (1,023 ) (983 ) Change in fair value of earn-out consideration** — — 4,060 — Other, net (25 ) 42 738 286 Other income, net $ 2,596 $ 1,787 $ 11,174 $ 4,300 * Includes unrealized gain of $1,971 and $4,955 on investments carried under ASC topic 825, "Financial Instruments" ("ASC 825"), fair value option for the three and nine months ended September 30, 2016 , respectively, and $1,419 and $2,179 , respectively, for the three and nine months ending September 30, 2015 . ** The Company recognized $4,060 of other income during the nine months ended September 30, 2016 due to the changes in the fair value of the earn-out consideration related to its acquisition of RPM Direct, LLC and RPM Data Solutions, LLC (the "RPM acquisition"). Recent Accounting Pronouncements In May 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2014-09, “Revenue from Contracts with Customers”. The new standard is effective for reporting periods beginning after December 15, 2017 and early adoption is not permitted. The comprehensive new standard will supersede existing revenue recognition guidance and require revenue to be recognized when promised goods or services are transferred to customers in amounts that reflect the consideration to which the Company expects to be entitled in exchange for those goods or services. Adoption of the new rules could affect the timing of revenue recognition for certain transactions of the Company. ASU No. 2014-09 is effective for the Company in the first quarter of fiscal 2018 using either one of two methods: (i) retrospectively to each prior reporting period presented with the option to elect certain practical expedients as defined within ASU No. 2014-09; or (ii) retrospectively with the cumulative effect of initially applying ASU No. 2014-09 recognized at the date of initial application and providing certain additional disclosures as defined per ASU No. 2014-09. The Company is currently evaluating the impact of adoption and the implementation approach to be used, changes to its accounting system and processes, and additional disclosure requirements that may be necessary. In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842). ASU No. 2016-02 requires the identification of arrangements that should be accounted for as leases by lessees. In general, for lease arrangements exceeding a twelve month term, these arrangements must now be recognized as assets and liabilities on the balance sheet of the lessee. Under ASU No. 2016-02, a right-of-use asset and lease obligation will be recorded for all leases, whether operating or financing, while the income statement will reflect lease expense for operating leases and amortization/interest expense for financing leases. The balance sheet amount recorded for existing leases at the date of adoption of ASU No. 2016-02 must be calculated using the applicable incremental borrowing rate at the date of adoption. In addition, ASU No. 2016-02 requires the use of the modified retrospective method, which will require adjustment to all comparative periods presented in the consolidated financial statements. The new guidance is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. The Company is currently evaluating the impact that the adoption of this guidance will have on its consolidated financial statements and the implementation approach to be used. In March 2016, FASB issued ASU No. 2016-05, Derivatives and Hedging: Effect of Derivative Contract Novations on Existing Hedge Accounting Relationships, which clarifies that a change in the counterparty to a derivative instrument that has been designated as a hedging instrument does not, in and of itself, require de-designation of that hedging relationship provided that all other hedge accounting criteria continue to be met. The new guidance is effective for fiscal years beginning after December 15, 2016, including interim periods within those fiscal years. An entity has the option to apply ASU No. 2016-05 on either a prospective basis or a modified retrospective basis. Early adoption is permitted. The adoption of ASU No. 2016-05 will not have any impact on the Company's consolidated financial statements. In March 2016, the FASB issued ASU No. 2016-08, Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations (Reporting Revenue Gross versus Net). ASU No. 2016-08 clarifies the implementation guidance on principal versus agent considerations. The guidance includes indicators to assist an entity in determining whether it controls a specified good or service before it is transferred to the customers. The amendments are effective for all entities for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. The Company is currently evaluating the impact that the adoption of this guidance will have on its consolidated financial statements. In March 2016, the FASB issued ASU No. 2016-09, Compensation – Stock Compensation (Topic 718). ASU No. 2016-09 identifies areas for simplification involving several aspects of accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, an option to recognize gross stock compensation expense with actual forfeitures recognized as they occur, as well as certain classifications on the statement of cash flows. The amendments are effective for all entities for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2016. Early adoption is permitted but all of the guidance must be adopted in the same period. The Company is currently evaluating the impact that the adoption of this guidance will have on its consolidated financial statements. In June 2016, FASB issued ASU No. 2016-13, Financial Instruments - Credit Losses, which require a financial asset (or a group of financial assets) measured at amortized cost basis to be presented at the net amount expected to be collected. The allowance for credit losses is a valuation account that is to be deducted from the amortized cost basis of the financial asset(s) to present the net carrying value at the amount expected to be collected on the financial asset. The new guidance is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. The amendment should be applied through a modified retrospective approach. Early adoption as of the fiscal years beginning after December 15, 2018 is permitted. The adoption of ASU No. 2016-13 is not expected to have a material effect on the Company's consolidated financial statements. In August 2016, FASB issued ASU No. 2016-15, Classification of Certain Cash Receipts and Cash Payments. The amendments apply to all entities that are required to present a statement of cash flows under Topic 230 . The amendments are an improvement to GAAP because they provide guidance for each of the eight issues, thereby reducing the current and potential future diversity in practice. The amendments are effective for fiscal years beginning after December 31, 2017 and interim periods within those annual periods and should be applied using a retrospective transition method to each period presented. The Company is currently evaluating the impact of adoption of this guidance on its consolidated financial statements, including the implementation approach to be used.

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2016
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share Basic earnings per share is computed by dividing net income to common stockholders by the weighted average number of common shares outstanding during each period. Diluted earnings per share is computed using the weighted average number of common shares plus the potentially dilutive effect of common stock equivalents issued and outstanding at the reporting date, using the treasury stock method. Stock options, restricted stock and restricted stock units that are anti-dilutive are excluded from the computation of weighted average shares outstanding. The following table sets forth the computation of basic and diluted earnings per share: Three months ended September 30, Nine months ended September 30, 2016 2015 2016 2015 Numerators: Net income $ 16,050 $ 15,162 $ 46,245 $ 36,803 Denominators: Basic weighted average common shares outstanding 33,624,401 33,307,312 33,542,258 33,320,477 Dilutive effect of share based awards 1,051,084 873,323 970,557 826,643 Diluted weighted average common shares outstanding 34,675,485 34,180,635 34,512,815 34,147,120 Earnings per share: Basic $ 0.48 $ 0.46 $ 1.38 $ 1.10 Diluted $ 0.46 $ 0.44 $ 1.34 $ 1.08 Weighted average common shares considered anti-dilutive in computing diluted earnings per share 32,516 61,738 97,574 98,527

Segment Information

Segment Information	9 Months Ended
	Sep. 30, 2016
Segment Reporting [Abstract]
Segment Information	Segment Information The Company's operating segments are significant strategic business units that align its products and services with how it manages its business, approaches key markets and interacts with its clients. Effective for the quarter and year ended December 31, 2015, the Company merged two of its operating segments (Operations Consulting and Finance Transformation, previously part of the Analytics and Business Transformation reportable segment) into the Consulting operating segment to reflect recent organizational changes. The Company has also revised its reportable segments to reflect management’s focus on the Analytics operating segment. All the other operating segments have been aggregated into the Operations Management reportable segment. Our current reportable segments are as follows: • Operations Management • Analytics The Company has restated the segment information for all prior periods presented herein to conform to the current presentation. This change in segment presentation does not affect the Company's consolidated statements of income, balance sheets or statements of cash flows. The Company's recent acquisitions of Liss Systems Limited and IQR Consulting Inc. are classified within the Operations Management and Analytics segments, respectively. (see Note 5 to the unaudited consolidated financial statements contained herein) The chief operating decision maker (“CODM”) generally reviews operating segment revenues and cost of revenues. The Company does not allocate and therefore the CODM does not evaluate operating expenses, foreign exchange gain/loss and other income/loss, net and income taxes by segment. The Company’s operating assets are shared by multiple segments. The Company manages assets on a total company basis, not by operating segment, and therefore asset information and capital expenditures by operating segment are not presented. Revenues and cost of revenues for each of the three months ended September 30, 2016 and 2015 for the Company's Operations Management and Analytics segments, respectively, are as follows: Three months ended September 30, 2016 Three months ended September 30, 2015 Operations Analytics Total Operations Analytics Total Revenues, net $ 129,563 $ 41,637 $ 171,200 $ 128,043 $ 35,460 $ 163,503 Cost of revenues (exclusive of depreciation and amortization) 85,988 25,779 111,767 81,477 21,721 103,198 Gross profit $ 43,575 $ 15,858 $ 59,433 $ 46,566 $ 13,739 $ 60,305 Operating expenses 42,074 39,556 Foreign exchange gain and Other income, net 4,337 1,978 Income tax expense 5,646 7,565 Net income $ 16,050 $ 15,162 Revenues and cost of revenues for each of the nine months ended September 30, 2016 and 2015 for the Company's Operations Management and Analytics segments, respectively, are as follows: Nine months ended September 30, 2016 Nine months ended September 30, 2015 Operations Analytics Total Operations Analytics Total Revenues, net $ 388,502 $ 120,212 $ 508,714 $ 376,943 $ 85,691 $ 462,634 Cost of revenues (exclusive of depreciation and amortization) 256,078 76,094 332,172 242,014 54,787 296,801 Gross profit $ 132,424 $ 44,118 $ 176,542 $ 134,929 $ 30,904 $ 165,833 Operating expenses 126,495 116,368 Foreign exchange gain and Other income, net 14,747 6,647 Income tax expense 18,549 19,309 Net income $ 46,245 $ 36,803

Business Combination, Goodwill

Business Combination, Goodwill and Intangible Assets	9 Months Ended
	Sep. 30, 2016
Business Combinations [Abstract]
Business Combination, Goodwill and Intangible Assets	Business Combination, Goodwill and Intangible Assets a) Liss Systems Limited On July 1, 2016, the Company together with its subsidiary ExlService (UK) Limited ("Exl UK"), entered into a share purchase agreement (the “Liss Agreement”) for the purchase of Liss Systems Limited ("Liss"). Pursuant to the Liss Agreement, Exl UK purchased all of the issued and outstanding share capital of Liss from the Liss shareholders for cash consideration of $5,202 , including negative working capital adjustments of $603 . A portion of the purchase consideration otherwise payable was placed into escrow as security for the post-closing indemnification obligations under the Liss Agreement. The Company also issued 33,459 shares of restricted common stock with an aggregate fair value of $1,754 to certain key employees of Liss, each of whom accepted employment positions with the Company upon consummation of the combination. The fair value of these grants will be recognized as compensation expense over the vesting period. Liss, now a subsidiary of the Company, is a provider of policy administration solutions for the life and pensions industry, combining both depth of life industry knowledge with expertise in the design and delivery of core system solutions. Liss’s flagship "LISSIA" platform includes multi-channel interfaces, underwriting, workflow engines, and document production modules to automate new policy issuance and simplify policy administration. With its flexible architecture, LISSIA is used for both traditional and unit-linked life and investment products. Liss’s technology platform combined with EXL platforms’ such as LifePRO ® will automate key customer processes from new business to policy administration with very little human interactions. The acquisition enables expansion of the Company’s solution set for the insurance market, and is expected to strengthen EXL’s end-to-end offering and bolster its position as a leader in the insurance industry. Accordingly, the Company paid a premium for the acquisition which is being reflected in the goodwill recognized from the purchase price allocation of the total consideration paid by the Company. The Company has preliminarily allocated the purchase price to the net tangible and intangible assets based on their fair values as set forth below: Amount (In thousands) Tangible assets $ 498 Tangible liabilities (993 ) Deferred tax liability (643 ) Identifiable intangible assets: Customer relationships 1,918 Developed technology 1,571 Trade names and trademarks 231 Goodwill 2,620 Total purchase price $ 5,202 The amount of goodwill recognized from the Liss acquisition is not deductible for tax purposes. The customer relationships, developed technology and trade names and trademarks intangibles from the Liss acquisition are being amortized over a useful life of eight , ten and five years, respectively. b) IQR Consulting Inc. On September 1, 2016, the Company's subsidiary, ExlService.com, LLC ("EXL LLC"), entered into a share purchase agreement (the “IQR Agreement”) for the purchase of IQR Consulting Inc. ("IQR"). Pursuant to the IQR Agreement, Exl LLC has purchased all of the issued and outstanding share capital of IQR from the IQR shareholders for an initial cash consideration of $5,052 (including a working capital adjustment of $652 ) and contingent cash consideration of $500 to be paid in the event of the renewal of a key client contract. A portion of the purchase consideration otherwise payable was placed into escrow as security for post-closing working capital adjustments and the indemnification obligations under the IQR Agreement. The Company also issued 21,987 restricted stock units with an aggregate fair value of $1,125 to certain key employees of IQR, each of whom accepted employment positions with the Company upon consummation of the combination. The fair value of these grants will be recognized as compensation expense over the vesting period. IQR, now a subsidiary of the Company, is a U.S.-based provider of marketing and risk analytics solutions to super-regional banks and credit unions. IQR specializes in data analytics and strategic consulting services. IQR’s industry focus aligns well with the Company's Analytics strengths and the Company anticipates the acquisition will bring even more value to its clients by enhancing customer satisfaction, increasing revenue growth and minimizing risk. The acquisition furthers penetration into super-regional banks, as well as the underserved credit union market, which we expect will increase the amount of business impact that is delivered to the Company's clients. Accordingly, the Company paid a premium for the acquisition, which is reflected in the goodwill recognized from the purchase price allocation of the total consideration paid by the Company. The Company has preliminarily allocated the purchase price to the net tangible and intangible assets based on their fair values as set forth below: Amount (In thousands) Tangible assets $ 1,438 Tangible liabilities (527 ) Deferred tax liability (865 ) Identifiable intangible assets: Customer relationships 2,300 Goodwill 3,206 Total purchase price $ 5,552 The amount of goodwill recognized from the IQR acquisition is not deductible for tax purposes. The customer relationships from the IQR acquisition are being amortized over the weighted average useful life of eight years. During the three months ended September 30, 2016, the Company recognized $403 of acquisition related costs for its Liss and IQR acquisitions. Such amounts are included in general and administrative expenses in the unaudited consolidated statements of income. The Company’s results of operations for the three and nine months ended September 30, 2016 includes revenues of $1,098 from its Liss and IQR acquisitions, since the date on which these acquisitions were consummated. It is not practicable to disclose the net earnings since management does not allocate or evaluate operating expenses and income taxes to its subsidiaries. Under ASC topic 805, “Business Combinations,” the preliminary allocation of the purchase price to the tangible and intangible assets and liabilities acquired may change for a period of up to one year from the date of the acquisition. The Company’s purchase accounting as of September 30, 2016 was incomplete and the Company expects to complete its valuation of the tangible assets, intangible assets and liabilities assumed as of the acquisition date during the fourth quarter of 2016. Accordingly, the Company may adjust the amounts recorded as of September 30, 2016 to reflect the final valuations of the assets acquired or liabilities assumed. Goodwill The following table sets forth details of the Company’s goodwill balance as of September 30, 2016 : Operations Management Analytics Total Balance at January 1, 2015 $ 122,814 $ 16,785 $ 139,599 Goodwill arising from RPM acquisition — 33,155 33,155 Currency translation adjustments (1,219 ) — (1,219 ) Balance at December 31, 2015 $ 121,595 $ 49,940 $ 171,535 Goodwill arising from Liss acquisition 2,620 — 2,620 Goodwill arising from IQR acquisition — 3,206 3,206 Currency translation adjustments (268 ) — (268 ) Balance at September 30, 2016 $ 123,947 $ 53,146 $ 177,093 Intangible Assets Information regarding the Company’s intangible assets is set forth below: As of September 30, 2016 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Customer relationships $ 68,957 $ (30,230 ) $ 38,727 Developed technology 13,747 (5,911 ) 7,836 Trade names and trademarks 5,892 (3,129 ) 2,763 Leasehold benefits 2,770 (2,243 ) 527 Non-compete agreements 2,045 (1,572 ) 473 $ 93,411 $ (43,085 ) $ 50,326 As of December 31, 2015 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Customer relationships $ 64,816 $ (24,215 ) $ 40,601 Developed technology 12,234 (4,363 ) 7,871 Trade names and trademarks 5,670 (2,683 ) 2,987 Leasehold benefits 2,789 (2,109 ) 680 Non-compete agreements 2,045 (1,451 ) 594 $ 87,554 $ (34,821 ) $ 52,733 Amortization expense for the three months ended September 30, 2016 and 2015 was $2,848 and $2,642 , respectively, and for the nine months ended September 30, 2016 and 2015 it was $8,281 and $7,509 , respectively. The remaining weighted average life of intangible assets was 6.0 years for customer relationships, 5.1 years for developed technology, 5.8 years for trade names and trademarks excluding indefinite life trade names and trademarks, 2.7 years for leasehold benefits and 2.8 years for non-compete agreements. The Company has $900 of indefinite lived trade names and trademarks as of September 30, 2016 and December 31, 2015 . Estimated amortization of intangible assets during the year ending September 30, 2017 $ 11,552 2018 $ 11,245 2019 $ 11,019 2020 $ 4,950 2021 and thereafter $ 10,660

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2016
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements Assets and Liabilities Measured at Fair Value The following table sets forth the Company’s assets and liabilities that were accounted for at fair value as of September 30, 2016 and December 31, 2015 . The table excludes accounts receivable, accounts payable and accrued expenses for which fair values approximate their carrying amounts. As of September 30, 2016 Level 1 Level 2 Level 3 Total Assets Money market and mutual funds* $ 116,242 $ — $ — $ 116,242 Derivative financial instruments — 6,622 — 6,622 Total $ 116,242 $ 6,622 $ — $ 122,864 Liabilities Derivative financial instruments $ — $ 1,816 $ — $ 1,816 Contingent consideration 500 $ 500 Total $ — $ 1,816 $ 500 $ 2,316 As of December 31, 2015 Level 1 Level 2 Level 3 Total Assets Money market and mutual funds $ 118,478 $ — $ — $ 118,478 Derivative financial instruments — 4,184 — 4,184 Total $ 118,478 $ 4,184 $ — $ 122,662 Liabilities Derivative financial instruments $ — $ 2,358 $ — $ 2,358 Fair value of earn-out consideration — — 4,060 4,060 Total $ — $ 2,358 $ 4,060 $ 6,418 * Includes short-term investments carried on fair value option under ASC 825 of $103,069 as of September 30, 2016 . Derivative Financial Instruments: The Company’s derivative financial instruments consist primarily of foreign currency forward exchange contracts. Fair values for derivative financial instruments are based on independent sources including highly rated financial institutions and are classified as Level 2. See Note 7 to our unaudited consolidated financial statements contained herein for further details on Derivatives and Hedge Accounting. Fair value of earn-out consideration: The fair value measurement of earn-out consideration is determined using Level 3 inputs. The Company’s earn-out consideration as of December 31, 2015 represents a component of the total purchase consideration for the March 2015 RPM acquisition. The measurement is calculated using unobservable inputs based on the Company’s own assessment of achievement of certain performance goals by RPM during the 2015 and 2016 calendar years. As of December 31, 2015, the Company estimated the fair value of the earn out consideration to be $4,060 , utilizing a Monte Carlo simulation. During the nine months ended September 30, 2016 , the Company re-estimated its earn-out liability utilizing a Monte Carlo simulation based on its assessment of the achievement of the performance goals of RPM during calendar year 2016 and accordingly reduced the liability to nil as of September 30, 2016 . The Monte-Carlo simulation model simulates a range of possible performance levels and estimates the probabilities of the potential payouts. This model also incorporates a range of assumptions like discount rate, risk-free rate, assumed cost of debt, etc. The Company's contingent consideration as of September 30, 2016 represents a component of total purchase consideration for the September 2016 IQR acquisition. As of September 30, 2016 the Company estimated the fair value of the contingent consideration as $500 , using management's best estimate of the current probability of renewal of a key client contract.

Derivatives and Hedge Accountin

Derivatives and Hedge Accounting	9 Months Ended
	Sep. 30, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives and Hedge Accounting	Derivatives and Hedge Accounting The Company uses derivative instruments and hedging transactions to mitigate exposure to foreign currency fluctuation risks associated with forecasted transactions denominated in certain foreign currencies and to minimize earnings and cash flow volatility associated with changes in foreign currency exchange rates. The Company’s derivative financial instruments consist of forward foreign exchange contracts and range forward contracts (a transaction where both a put option is purchased and a call option is sold), that are designated effective and that qualify as cash flow hedges under ASC 815. The Company had outstanding cash flow hedges totaling $221,295 (including $2,550 of range forward contracts) as of September 30, 2016 and $230,894 as of December 31, 2015. The fair value of these cash flow hedges is included in the accumulated other comprehensive loss ("AOCI")on the Company's unaudited consolidated balance sheet. The Company also enters into foreign currency forward contracts to economically hedge its intercompany balances and other monetary assets and liabilities denominated in currencies other than functional currencies. These derivatives do not qualify as fair value hedges under ASC No. 815. Changes in the fair value of these derivatives are recognized in the consolidated statements of income and are included in foreign exchange gain/loss. The Company’s primary exchange rate exposure is with the Indian Rupee, the U.K. pound sterling and the Philippine peso. The Company also has exposure to Colombian pesos, Czech Koruna, Euro, South African ZAR and other local currencies in which it operates. Outstanding foreign currency forward contracts amounted to $62,198 and GBP 18,519 as of September 30, 2016 and amounted to $61,641 and GBP 13,256 as of December 31, 2015. The Company estimates that approximately $3,111 of net derivative gains included in AOCI could be reclassified into earnings within the next twelve months based on exchange rates prevailing as of September 30, 2016 . At September 30, 2016 , the maximum outstanding term of the cash flow hedges was forty-five months . The Company evaluates hedge effectiveness at the time a contract is entered into as well as on an ongoing basis. If during this time, a contract is deemed ineffective, the change in the fair value is recorded in the consolidated statements of income and is included in foreign exchange gain/(loss). For hedging positions that are discontinued because the forecasted transaction is not expected to occur by the end of the originally specified period, any related derivative amounts recorded in equity are reclassified to earnings. There were no such significant amounts of gains or losses that were reclassified from AOCI into earnings during the three and nine months ended September 30, 2016 and 2015 . The following tables set forth the fair value of the foreign currency exchange contracts and their location on the unaudited consolidated financial statements: Derivatives designated as hedging instruments: September 30, 2016 December 31, 2015 Other current assets: Foreign currency exchange contracts $ 4,177 $ 2,664 Other assets: Foreign currency exchange contracts $ 2,377 $ 1,175 Accrued expenses and other current liabilities: Foreign currency exchange contracts $ 1,066 $ 1,226 Other non current liabilities: Foreign currency exchange contracts $ 719 $ 1,132 Derivatives not designated as hedging instruments: September 30, 2016 December 31, 2015 Other current assets: Foreign currency exchange contracts $ 68 $ 345 Accrued expenses and other current liabilities: Foreign currency exchange contracts $ 31 — The following tables set forth the effect of foreign currency exchange contracts on the unaudited consolidated statements of income for the three months ended September 30, 2016 and 2015 : Derivatives in Cash Flow Hedging Relationships Amount of Gain/(Loss) Recognized in AOCI on Derivative (Effective Portion) Location of Gain/(Loss) Reclassified from AOCI into Income (Effective Portion) Amount of Gain/(Loss) Reclassified from AOCI into Income (Effective Portion) Location of Gain/(Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing) Amount of Gain/(Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing) 2016 2015 2016 2015 2016 2015 Foreign exchange contracts $ 3,607 $ (3,526 ) Foreign exchange gain/(loss) $ 466 $ (430 ) Foreign exchange gain/(loss) $ — $ — Derivatives not designated as Hedging Instruments Amount of Gain/(Loss) Recognized in Income on Derivatives Location of Gain or (Loss) Recognized in Income on Derivatives 2016 2015 Foreign exchange contracts Foreign exchange gain/(loss) $ 1,382 $ 705 The following tables set forth the effect of foreign currency exchange contracts on the unaudited consolidated statements of income for the nine months ended September 30, 2016 and 2015 : Derivatives in Cash Flow Hedging Relationships Amount of Gain/(Loss) Recognized in AOCI on Derivative (Effective Portion) Location of Gain/(Loss) Reclassified from AOCI into Income (Effective Portion) Amount of Gain/(Loss) Reclassified from AOCI into Income (Effective Portion) Location of Gain/(Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing) Amount of Gain/(Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing) 2016 2015 2016 2015 2016 2015 Foreign exchange contracts $ 4,160 $ (2,741 ) Foreign exchange gain/(loss) $ 872 $ (963 ) Foreign exchange gain/(loss) $ — $ — Derivatives not designated Amount of Gain/(Loss) Location of Gain or (Loss) Recognized in 2016 2015 Foreign exchange contracts Foreign exchange gain/(loss) $ 4,110 $ 94

Fixed Assets

Fixed Assets	9 Months Ended
	Sep. 30, 2016
Property, Plant and Equipment [Abstract]
Fixed Assets	Fixed Assets Fixed assets consist of the following: September 30, 2016 December 31, 2015 Owned Assets: Network equipment, computers and software $ 104,843 $ 95,245 Leasehold improvements 30,383 28,603 Office furniture and equipment 15,146 14,000 Capital work in progress 5,554 3,140 Buildings 1,194 1,202 Land 781 787 Motor vehicles 565 540 158,466 143,517 Less: Accumulated depreciation and amortization (109,869 ) (96,079 ) $ 48,597 $ 47,438 Assets under capital leases: Leasehold improvements $ 864 $ 877 Office furniture and equipment 127 136 Motor vehicles 743 806 1,734 1,819 Less: Accumulated depreciation and amortization (1,325 ) (1,266 ) $ 409 $ 553 Fixed assets, net $ 49,006 $ 47,991 Depreciation and amortization expense excluding amortization of acquisition-related intangibles for the three months ended September 30, 2016 and 2015 was $5,749 , and $5,415 , respectively, and for the nine months ended September 30, 2016 and 2015 was $16,719 and $15,662 , respectively. Capital work in progress represents advances paid towards acquisition of fixed assets and cost of fixed assets and internally generated software costs not yet ready to be placed in service.

Capital Structure

Capital Structure	9 Months Ended
	Sep. 30, 2016
Equity [Abstract]
Capital Structure	Capital Structure Common Stock The Company has one class of common stock outstanding. During the three months ended September 30, 2016 and 2015 , the Company did no t acquire any shares of common stock from employees in connection with withholding tax payments related to the vesting of restricted stock. During the nine months ended September 30, 2016 and 2015 , the Company acquired 16,027 and 13,573 shares of common stock, respectively, from employees in connection with withholding tax payments related to the vesting of restricted stock units for a total consideration of $728 and $421 , respectively. The weighted average purchase price of $45.44 and $30.99 , respectively, was the average of the high and low price of a share of the Company’s common stock on the Nasdaq Global Select Market on the trading day prior to the vesting date of the shares of restricted stock. On December 30, 2014, the Company’s Board of Directors authorized up to an annual $20,000 common stock repurchase program (the “2014 Repurchase Program”), under which shares may be purchased by the Company from time to time from the open market and through private transactions during each of the fiscal years 2015 to 2017 . During the three and nine months ended September 30, 2016 , the Company purchased 108,143 and 302,953 shares of its common stock, respectively, for an aggregate purchase price of approximately $5,466 and $14,441 , respectively, including commissions, representing an average purchase price per share of $50.54 and $47.67 , respectively, under the 2014 Repurchase program. During the three and nine months ended September 30, 2015 , the Company purchased 220,579 and 354,448 shares of its common stock, respectively, for an aggregate purchase price of approximately $8,149 and $12,834 , respectively, including commissions, representing an average purchase price per share of $36.94 and $36.21 , respectively, under the 2014 Repurchase Program. Repurchased shares have been recorded as treasury shares and will be held until the Board of Directors designates that these shares be retired or used for other purposes.

Borrowings

Borrowings	9 Months Ended
	Sep. 30, 2016
Debt Disclosure [Abstract]
Borrowings	Borrowings On October 24, 2014, the Company entered into a credit agreement (as amended, the “Credit Agreement”) with certain lenders and JPMorgan Chase Bank, N.A., as Administrative Agent. The Credit Agreement, as amended, provides for a $100,000 revolving credit facility (the “Credit Facility”), including a letter of credit sub-facility. The Credit Facility has a maturity date of October 24, 2019 and is voluntarily pre-payable from time to time without premium or penalty. Borrowings under the Credit Facility may be used for working capital, general corporate purposes and for acquisitions. The Company has outstanding debt of $45,000 and $70,000 as of September 30, 2016 and December 31, 2015, respectively, of which $5,000 is expected to be repaid within the next twelve months and is included under “short-term borrowings” in the unaudited consolidated balance sheets. The Credit Facility carried an effective interest rate of approximately 1.95% and 1.56% per annum during the nine months ended September 30, 2016 and 2015 , respectively. In connection with the financing, the Company incurred certain debt issuance costs, which are deferred and amortized as an adjustment to interest expense over the term of the Credit Facility. The unamortized debt issuance costs as of September 30, 2016 and December 31, 2015 were $296 and $368 , respectively and are included under "other current assets" and "other assets" in the unaudited consolidated balance sheets. The obligations under the Credit Agreement are secured by all or substantially all of the assets of the Company and its material domestic subsidiaries. The Credit Agreement contains certain covenants including a restriction on indebtedness of the Company. As of September 30, 2016 , the Company was in compliance with all covenants.

Employee Benefit Plans

Employee Benefit Plans	9 Months Ended
	Sep. 30, 2016
Compensation and Retirement Disclosure [Abstract]
Employee Benefit Plans	Employee Benefit Plans The Company’s Gratuity Plans in India and the Philippines ("Gratuity Plan") provide for lump sum payment to vested employees on retirement or upon termination of employment in an amount based on the respective employee’s salary and years of employment with the Company. Liabilities with regard to the Gratuity Plans are determined by actuarial valuation using the projected unit credit method. Current service costs for the Gratuity Plan are accrued in the year to which they relate. 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. Net gratuity cost includes the following components: Three months ended September 30, Nine months ended September 30, 2016 2015 2016 2015 Service cost $ 402 $ 403 $ 1,203 $ 1,241 Interest cost 150 135 449 417 Expected return on plan assets (104 ) (94 ) (312 ) (291 ) Actuarial loss 23 51 67 159 Net gratuity cost $ 471 $ 495 $ 1,407 $ 1,526 The Gratuity Plan in India is partially funded. The Company makes annual contributions to the employees' gratuity fund established with Life Insurance Corporation of India and HDFC Standard Life Insurance Company. They calculate the annual contribution required to be made by the Company and manage the Gratuity Plans, including any required payouts. Fund managers manage these funds on a cash accumulation basis and declare interest retrospectively on March 31 of each year. The Company earned a return of approximately 9.0% each on these Gratuity Plans for the years ended March 31, 2016 and 2015. Change in Plan Assets Plan assets at January 1, 2016 $ 4,923 Actual return 328 Benefits paid (656 ) Effect of exchange rate changes (36 ) Plan assets at September 30, 2016 $ 4,559 The Company maintains the Exl Service 401(k) Plan (the “401(k) Plan”) under Section 401(k) of the Internal Revenue Code of 1986 (the “Code”), covering all eligible employees, as defined in the 401(k) Plan. The Company may make discretionary contributions of up to a maximum of 3% of employee compensation within certain limits. The Company has made provisions for contributions to the 401(k) Plan amounting to $554 and $400 during the three months ended September 30, 2016 and 2015 , respectively, and $1,945 and $1,551 during the nine months ended September 30, 2016 and 2015 , respectively. During the three months ended September 30, 2016 and 2015 , the Company contributed $1,608 and $1,463 , respectively, and during the nine months ended September 30, 2016 and 2015 , the Company contributed $4,619 and $4,393 , respectively, for various defined contribution plans on behalf of its employees in India, the Philippines, Romania, Bulgaria, Colombia, Singapore, South Africa and the Czech Republic.

Leases

Leases	9 Months Ended
	Sep. 30, 2016
Leases [Abstract]
Leases	Leases The Company finances its use of certain motor vehicles under lease arrangements provided by financial institutions. Future minimum lease payments under these capital leases as of September 30, 2016 are as follows: Year ending September 30, 2017 $ 282 2018 135 2019 80 2020 34 Total minimum lease payments 531 Less: amount representing interest 80 Present value of minimum lease payments 451 Less: current portion 237 Long term capital lease obligation $ 214 The Company conducts its operations using facilities leased under non-cancelable operating lease agreements that expire at various dates. Future minimum lease payments under non-cancellable agreements expiring after September 30, 2016 are set forth below: Year ending September 30, 2017 $ 9,936 2018 8,471 2019 6,622 2020 3,994 2021 2,535 2022 and thereafter 1,520 $ 33,078 The operating leases are subject to renewal periodically and have scheduled rent increases. The Company recognizes rent on such leases on a straight line basis over the non-cancelable lease period determined under ASC topic 840, “Leases”. Rent expense under both cancelable and non-cancelable operating leases was $5,445 and $4,994 for the three months ended September 30, 2016 and 2015 , respectively and $15,871 and $15,089 for the nine months ended September 30, 2016 and 2015 , respectively. Deferred rent as of September 30, 2016 and December 31, 2015 was $7,828 and $7,066 , respectively, and is included under “Accrued expenses and other current liabilities” and “Non-current liabilities” in the consolidated balance sheets.

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2016
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company determines the tax provision for interim periods using an estimate of its annual effective tax rate adjusted for discrete items, if any, that are taken into account in the relevant period. Each quarter, the Company updates its estimate of annual effective tax rate, and if its estimated tax rate changes, the Company makes a cumulative adjustment. The Company recorded income tax expense of $5,646 and $7,565 , respectively, for the three months ended September 30, 2016 and 2015 . The effective tax rate decreased from 33.3% during the three months ended September 30, 2015 to 26.0% during the three months ended September 30, 2016 . The decrease was the result of (i) higher income tax expense during the three months ended September 30, 2015 due to certain adjustments (resulting in an increase in income tax expense of approximately $600 ), and (ii) an increase in earnings in locations with lower tax rates as well as tax incentives. The Company recorded income tax expense of $18,549 and $19,309 , respectively, for the nine months ended September 30, 2016 and 2015 . The effective tax rate decreased from 34.4% during the nine months ended September 30, 2015 to 28.6% during the nine months ended September 30, 2016 . The decrease was the result of (i) higher income tax expense during the nine months ended September 30, 2015 due to certain adjustments (resulting in an increase in income tax expense of approximately $2,400 ) and (ii) an increase in earnings in locations with lower tax rates as well as tax incentives. The decrease in effective tax rate was partially offset by the reversal of earn-out liability of $4,060 in other income during the nine months ended September 30, 2016 related to the Company's RPM acquisition. The following table summarizes the activity related to the gross unrecognized tax benefits from January 1, 2016 through September 30, 2016 : Balance as of January 1, 2016 $ 2,797 Increases related to prior year tax positions — Decreases related to prior year tax positions — Increases related to current year tax positions — Decreases related to current year tax positions — Effect of exchange rate changes (12 ) Balance as of September 30, 2016 $ 2,785 The unrecognized tax benefits as of September 30, 2016 of $2,785 if recognized, would impact the effective tax rate. During the three months ended September 30, 2016 and 2015 , the Company has recognized interest of $50 and $74 , respectively, which are included in the income tax expense in the unaudited consolidated statements of income. As of September 30, 2016 and December 31, 2015, the Company has accrued approximately $1,410 and $1,269 , respectively, in interest relating to unrecognized tax benefits.

Stock Based Compensation

Stock Based Compensation	9 Months Ended
	Sep. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Based Compensation	Stock Based Compensation The following costs related to the Company’s stock-based compensation plan are included in the unaudited consolidated statements of income: Three months ended September 30, Nine months ended September 30, 2016 2015 2016 2015 Cost of revenue $ 795 $ 740 $ 2,848 $ 2,394 General and administrative expenses 1,905 1,613 6,241 4,482 Selling and marketing expenses 1,784 2,118 5,654 5,404 Total $ 4,484 $ 4,471 $ 14,743 $ 12,280 As of September 30, 2016 , the Company had 1,967,539 shares available for grant under the 2015 Amendment and Restatement of the 2006 Omnibus Award Plan. Stock Options Stock option activity under the Company’s stock plans is shown below: Number of Weighted- Aggregate Weighted- Outstanding at December 31, 2015 1,210,141 $ 16.31 $ 34,638 3.50 Granted — — Exercised (386,739 ) 16.10 Forfeited — — Outstanding at September 30, 2016 823,402 $ 16.41 $ 27,530 3.05 Vested and exercisable at September 30, 2016 823,402 $ 16.41 $ 27,530 3.05 The unrecognized compensation cost for unvested options as of September 30, 2016 is nil . The Company did no t grant any options during the three and nine months ended September 30, 2016 and 2015 . There were no options that vested during the three months ended September 30, 2016 and September 30, 2015 . The total grant date fair value of options vested during the nine months ended September 30, 2016 and September 30, 2015 was $706 and $1,170 , respectively. Restricted Stock and Restricted Stock Units Restricted stock and restricted stock unit activity under the Company’s stock plans is shown below: Restricted Stock Restricted Stock Units Number Weighted- Average Intrinsic Value Number Weighted- Average Intrinsic Value Outstanding at December 31, 2015* 134,935 $ 35.27 1,228,287 $ 30.06 Granted 33,459 52.41 420,403 48.83 Vested (15,057 ) 34.61 (335,022 ) 28.68 Forfeited — — (66,315 ) 32.23 Outstanding at September 30, 2016* 153,337 $ 39.08 1,247,353 $ 36.64 * As of September 30, 2016 and December 31, 2015 restricted stock units vested for which the underlying common stock is yet to be issued are 135,054 and 149,364 , respectively. As of September 30, 2016 , unrecognized compensation cost of $40,077 is expected to be expensed over a weighted average period of 2.68 years. Performance Based Stock Awards Performance restricted stock unit (the "PRSU's") activity under the Company’s stock plans is shown below: Revenue Based PRSUs Market Condition Based PRSUs Number Weighted Avg Fair Value Number Weighted Avg Fair Value Outstanding at December 31, 2015 107,213 $ 30.88 207,212 $ 38.80 Granted 59,861 48.57 59,859 67.94 Vested — — — — Forfeited (5,600 ) 36.86 (5,600 ) 55.35 Outstanding at September 30, 2016* 161,474 $ 37.23 261,471 $ 45.12 As of September 30, 2016 , unrecognized compensation cost of $10,426 is expected to be expensed over a weighted average period of 1.74 years.

Geographical Information

Geographical Information	9 Months Ended
	Sep. 30, 2016
Segment Reporting [Abstract]
Geographical Information	Geographical Information The Company attributes the revenues to regions based upon location of its customers. Three months ended September 30, Nine months ended September 30, 2016 2015 2016 2015 Revenues, net United States $ 137,047 $ 129,886 $ 407,272 $ 364,591 United Kingdom 27,993 28,262 84,284 81,550 Rest of World 6,160 5,355 17,158 16,493 $ 171,200 $ 163,503 $ 508,714 $ 462,634 September 30, 2016 December 31, 2015 Fixed assets, net India $ 24,089 $ 23,415 United States 10,917 10,680 Philippines 10,811 11,285 Rest of World 3,189 2,611 $ 49,006 $ 47,991

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2016
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Fixed Asset Commitments At September 30, 2016 , the Company has committed to spend approximately $6,400 under agreements to purchase fixed assets. This amount is net of capital advances paid in respect of these purchases. Other Commitments Certain units of the Company’s Indian subsidiaries were established as 100% Export-Oriented units or under the Software Technology Parks of India (“STPI”) scheme promulgated 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. The Company’s management believes, however, that these units have in the past satisfied and will continue to satisfy the required conditions. The Company’s operations centers in the Philippines are registered with the Philippine Economic Zone Authority (“PEZA”). The registration provides the Company with certain fiscal incentives on the import of capital goods and requires ExlService Philippines, Inc. to meet certain performance and investment criteria. The Company’s management believes that these centers have in the past satisfied and will continue to satisfy the required criteria. Contingencies U.S. and Indian transfer pricing regulations require that any international transaction involving associated enterprises be at an arm’s-length price. Accordingly, the Company determines the appropriate pricing for the international transactions among its associated enterprises on the basis of a detailed functional and economic analysis involving benchmarking against transactions among entities that are not under common control. The tax authorities have jurisdiction to review this arrangement and in the event that they determine that the transfer price applied was not appropriate, the Company may incur increased tax liability, including accrued interest and penalties. The Company is currently involved in disputes with the Indian tax authorities over the application of some of its transfer pricing policies for some of its subsidiaries. Further, the Company and a U.S. subsidiary are engaged in tax litigation with the income-tax authorities in India on the issue of permanent establishment. The aggregate disputed amount demanded by Indian tax authorities from the Company related to its transfer pricing issues for years ranging from tax years 2003 to 2013 and its permanent establishment issues ranging from tax years 2003 to 2007 as of September 30, 2016 and December 31, 2015 is $20,540 and $21,360 , respectively, of which the Company has made payments or provided a bank guarantee to the extent of $14,563 and $14,668 , respectively. Amounts paid as deposits in respect of such assessments aggregating to $12,574 and $12,665 as of September 30, 2016 and December 31, 2015 , respectively, are included in “Other assets” and amounts deposited for bank guarantees aggregating to $1,989 and $2,003 as of September 30, 2016 and December 31, 2015 , respectively, are included in “Restricted cash” in the non-current assets section of the Company’s consolidated balance sheets as of September 30, 2016 and December 31, 2015 . Based on advice from its Indian tax advisors, the facts underlying the Company’s position and its experience with these types of assessments, the Company believes that the probability that it will ultimately be found liable for these assessments is remote and accordingly has not accrued any amount with respect to these matters in its consolidated financial statements. The Company does not expect any impact from these assessments on its future income tax expense. It is possible that the Company might receive similar orders or assessments from tax authorities for subsequent years. Accordingly even if these disputes are resolved, the Indian tax authorities may still serve additional orders or assessments.

Subsequent Event

Subsequent Event	9 Months Ended
	Sep. 30, 2016
Subsequent Events [Abstract]
Subsequent Event	Subsequent Event On October 21, 2016, Exl LLC purchased Datasource Consulting, LLC ("Datasource"), a Colorado limited liability company for $18,800 , subject to a working capital adjustment. The Company also issued restricted stock at a fair value of $4,700 to certain key employees of Datasource, each of whom accepted new employment terms as part of the consummation of the combination. Datasource is a provider of enterprise data management and business intelligence solutions. .

Summary of Significant Accoun25

Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2016
Accounting Policies [Abstract]
Basis of Presentation	The unaudited interim consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“US GAAP”) for interim financial information, the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by US GAAP for annual financial statements and therefore should be read in conjunction with the audited consolidated financial statements and footnotes thereto included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2015. The unaudited interim consolidated financial statements reflect all adjustments (of a normal and recurring nature) that management considers necessary for a fair presentation of such statements for the interim periods presented. The unaudited consolidated statements of income for the interim periods presented are not necessarily indicative of the results for the full year or for any subsequent period.
Principles of Consolidation	The accompanying unaudited consolidated financial statements include the financial statements of ExlService Holdings and all of its subsidiaries. All intercompany balances and transactions have been eliminated in consolidation.
Use of Estimates	The preparation of the unaudited consolidated financial statements in conformity with US GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the unaudited consolidated financial statements and the unaudited consolidated statements of income during the reporting period. Although these estimates are based on management’s best assessment of the current business environment, actual results may be different from those estimates. The significant estimates and assumptions that affect the financial statements include, but are not limited to, allowance for doubtful receivables, service tax receivables, assets and obligations related to employee benefit plans, deferred tax valuation allowances, income-tax uncertainties and other contingencies, valuation of derivative financial instruments, stock-based compensation expense, depreciation and amortization periods, purchase price allocation, recoverability of long-term assets including goodwill and intangibles, and estimates to complete the fixed price contracts.
Accumulated Other Comprehensive Loss	Accumulated other comprehensive loss consists of amortization of actuarial gain/(loss) on retirement benefits and changes in the cumulative foreign currency translation adjustments. In addition, the Company enters into foreign currency exchange contracts, which are designated as cash flow hedges in accordance with ASC topic 815, "Derivatives and Hedging" ("ASC 815"). Changes in the fair values of contracts that are deemed effective are recorded as a component of accumulated other comprehensive loss until the settlement of those contracts.
Recent Accounting Pronouncements	In May 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2014-09, “Revenue from Contracts with Customers”. The new standard is effective for reporting periods beginning after December 15, 2017 and early adoption is not permitted. The comprehensive new standard will supersede existing revenue recognition guidance and require revenue to be recognized when promised goods or services are transferred to customers in amounts that reflect the consideration to which the Company expects to be entitled in exchange for those goods or services. Adoption of the new rules could affect the timing of revenue recognition for certain transactions of the Company. ASU No. 2014-09 is effective for the Company in the first quarter of fiscal 2018 using either one of two methods: (i) retrospectively to each prior reporting period presented with the option to elect certain practical expedients as defined within ASU No. 2014-09; or (ii) retrospectively with the cumulative effect of initially applying ASU No. 2014-09 recognized at the date of initial application and providing certain additional disclosures as defined per ASU No. 2014-09. The Company is currently evaluating the impact of adoption and the implementation approach to be used, changes to its accounting system and processes, and additional disclosure requirements that may be necessary. In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842). ASU No. 2016-02 requires the identification of arrangements that should be accounted for as leases by lessees. In general, for lease arrangements exceeding a twelve month term, these arrangements must now be recognized as assets and liabilities on the balance sheet of the lessee. Under ASU No. 2016-02, a right-of-use asset and lease obligation will be recorded for all leases, whether operating or financing, while the income statement will reflect lease expense for operating leases and amortization/interest expense for financing leases. The balance sheet amount recorded for existing leases at the date of adoption of ASU No. 2016-02 must be calculated using the applicable incremental borrowing rate at the date of adoption. In addition, ASU No. 2016-02 requires the use of the modified retrospective method, which will require adjustment to all comparative periods presented in the consolidated financial statements. The new guidance is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. The Company is currently evaluating the impact that the adoption of this guidance will have on its consolidated financial statements and the implementation approach to be used. In March 2016, FASB issued ASU No. 2016-05, Derivatives and Hedging: Effect of Derivative Contract Novations on Existing Hedge Accounting Relationships, which clarifies that a change in the counterparty to a derivative instrument that has been designated as a hedging instrument does not, in and of itself, require de-designation of that hedging relationship provided that all other hedge accounting criteria continue to be met. The new guidance is effective for fiscal years beginning after December 15, 2016, including interim periods within those fiscal years. An entity has the option to apply ASU No. 2016-05 on either a prospective basis or a modified retrospective basis. Early adoption is permitted. The adoption of ASU No. 2016-05 will not have any impact on the Company's consolidated financial statements. In March 2016, the FASB issued ASU No. 2016-08, Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations (Reporting Revenue Gross versus Net). ASU No. 2016-08 clarifies the implementation guidance on principal versus agent considerations. The guidance includes indicators to assist an entity in determining whether it controls a specified good or service before it is transferred to the customers. The amendments are effective for all entities for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. The Company is currently evaluating the impact that the adoption of this guidance will have on its consolidated financial statements. In March 2016, the FASB issued ASU No. 2016-09, Compensation – Stock Compensation (Topic 718). ASU No. 2016-09 identifies areas for simplification involving several aspects of accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, an option to recognize gross stock compensation expense with actual forfeitures recognized as they occur, as well as certain classifications on the statement of cash flows. The amendments are effective for all entities for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2016. Early adoption is permitted but all of the guidance must be adopted in the same period. The Company is currently evaluating the impact that the adoption of this guidance will have on its consolidated financial statements. In June 2016, FASB issued ASU No. 2016-13, Financial Instruments - Credit Losses, which require a financial asset (or a group of financial assets) measured at amortized cost basis to be presented at the net amount expected to be collected. The allowance for credit losses is a valuation account that is to be deducted from the amortized cost basis of the financial asset(s) to present the net carrying value at the amount expected to be collected on the financial asset. The new guidance is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. The amendment should be applied through a modified retrospective approach. Early adoption as of the fiscal years beginning after December 15, 2018 is permitted. The adoption of ASU No. 2016-13 is not expected to have a material effect on the Company's consolidated financial statements. In August 2016, FASB issued ASU No. 2016-15, Classification of Certain Cash Receipts and Cash Payments. The amendments apply to all entities that are required to present a statement of cash flows under Topic 230 . The amendments are an improvement to GAAP because they provide guidance for each of the eight issues, thereby reducing the current and potential future diversity in practice. The amendments are effective for fiscal years beginning after December 31, 2017 and interim periods within those annual periods and should be applied using a retrospective transition method to each period presented. The Company is currently evaluating the impact of adoption of this guidance on its consolidated financial statements, including the implementation approach to be used.

Summary of Significant Accoun26

Summary of Significant Accounting Policies (Tables)	9 Months Ended
	Sep. 30, 2016
Accounting Policies [Abstract]
Schedule of Other Current Assets	Other current assets consists of the following: September 30, 2016 December 31, 2015 Derivative instruments $ 4,245 $ 3,009 Advances to suppliers 1,366 1,545 Receivables from statutory authorities 11,073 8,676 Others 2,032 1,989 Other current assets $ 18,716 $ 15,219
Summary of Accrued Expenses and Other Current Liabilities	Accrued expenses and other current liabilities consists of the following: September 30, 2016 December 31, 2015 Accrued expenses $ 27,356 $ 26,238 Derivative instruments 1,097 1,226 Client liability 2,515 2,217 Other current liabilities 7,394 4,569 Accrued expenses and other current liabilities $ 38,362 $ 34,250
Summary of Non-current Liabilities	Non-current liabilities consists of the following: September 30, 2016 December 31, 2015 Derivative instruments $ 719 $ 1,132 Unrecognized tax benefits 3,195 3,066 Deferred rent 6,308 6,515 Retirement benefits 1,398 1,441 Other non-current liabilities 1,585 5,501 Non-current liabilities $ 13,205 $ 17,655
Schedule of Accumulated Other Comprehensive Income (Loss)	The balances as of September 30, 2016 and December 31, 2015 are as follows: September 30, 2016 December 31, 2015 Cumulative currency translation adjustments $ (70,715 ) $ (68,063 ) Unrealized gain on cash flow hedges, net of taxes of $1,370 and $662 3,404 824 Retirement benefits, net of taxes of ($174) and ($201) 387 (86 ) Accumulated other comprehensive loss $ (66,924 ) $ (67,325 )
Summary of Other Income, net	Other income, net consists of the following: Three months ended September 30, Nine months ended September 30, 2016 2015 2016 2015 Interest and dividend income* $ 2,916 $ 2,085 $ 7,399 $ 4,997 Interest expense (295 ) (340 ) (1,023 ) (983 ) Change in fair value of earn-out consideration** — — 4,060 — Other, net (25 ) 42 738 286 Other income, net $ 2,596 $ 1,787 $ 11,174 $ 4,300 * Includes unrealized gain of $1,971 and $4,955 on investments carried under ASC topic 825, "Financial Instruments" ("ASC 825"), fair value option for the three and nine months ended September 30, 2016 , respectively, and $1,419 and $2,179 , respectively, for the three and nine months ending September 30, 2015 . ** The Company recognized $4,060 of other income during the nine months ended September 30, 2016 due to the changes in the fair value of the earn-out consideration related to its acquisition of RPM Direct, LLC and RPM Data Solutions, LLC (the "RPM acquisition").

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2016
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	The following table sets forth the computation of basic and diluted earnings per share: Three months ended September 30, Nine months ended September 30, 2016 2015 2016 2015 Numerators: Net income $ 16,050 $ 15,162 $ 46,245 $ 36,803 Denominators: Basic weighted average common shares outstanding 33,624,401 33,307,312 33,542,258 33,320,477 Dilutive effect of share based awards 1,051,084 873,323 970,557 826,643 Diluted weighted average common shares outstanding 34,675,485 34,180,635 34,512,815 34,147,120 Earnings per share: Basic $ 0.48 $ 0.46 $ 1.38 $ 1.10 Diluted $ 0.46 $ 0.44 $ 1.34 $ 1.08 Weighted average common shares considered anti-dilutive in computing diluted earnings per share 32,516 61,738 97,574 98,527

Segment Information (Tables)

Segment Information (Tables)	9 Months Ended
	Sep. 30, 2016
Segment Reporting [Abstract]
Revenues and Cost of Revenues for Company's Operations Management and Analytics and Business Transformation Segments	Revenues and cost of revenues for each of the three months ended September 30, 2016 and 2015 for the Company's Operations Management and Analytics segments, respectively, are as follows: Three months ended September 30, 2016 Three months ended September 30, 2015 Operations Analytics Total Operations Analytics Total Revenues, net $ 129,563 $ 41,637 $ 171,200 $ 128,043 $ 35,460 $ 163,503 Cost of revenues (exclusive of depreciation and amortization) 85,988 25,779 111,767 81,477 21,721 103,198 Gross profit $ 43,575 $ 15,858 $ 59,433 $ 46,566 $ 13,739 $ 60,305 Operating expenses 42,074 39,556 Foreign exchange gain and Other income, net 4,337 1,978 Income tax expense 5,646 7,565 Net income $ 16,050 $ 15,162 Revenues and cost of revenues for each of the nine months ended September 30, 2016 and 2015 for the Company's Operations Management and Analytics segments, respectively, are as follows: Nine months ended September 30, 2016 Nine months ended September 30, 2015 Operations Analytics Total Operations Analytics Total Revenues, net $ 388,502 $ 120,212 $ 508,714 $ 376,943 $ 85,691 $ 462,634 Cost of revenues (exclusive of depreciation and amortization) 256,078 76,094 332,172 242,014 54,787 296,801 Gross profit $ 132,424 $ 44,118 $ 176,542 $ 134,929 $ 30,904 $ 165,833 Operating expenses 126,495 116,368 Foreign exchange gain and Other income, net 14,747 6,647 Income tax expense 18,549 19,309 Net income $ 46,245 $ 36,803

Business Combination, Goodwil29

Business Combination, Goodwill and Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2016
Business Combinations [Abstract]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	The Company has preliminarily allocated the purchase price to the net tangible and intangible assets based on their fair values as set forth below: Amount (In thousands) Tangible assets $ 1,438 Tangible liabilities (527 ) Deferred tax liability (865 ) Identifiable intangible assets: Customer relationships 2,300 Goodwill 3,206 Total purchase price $ 5,552 The Company has preliminarily allocated the purchase price to the net tangible and intangible assets based on their fair values as set forth below: Amount (In thousands) Tangible assets $ 498 Tangible liabilities (993 ) Deferred tax liability (643 ) Identifiable intangible assets: Customer relationships 1,918 Developed technology 1,571 Trade names and trademarks 231 Goodwill 2,620 Total purchase price $ 5,202
Summary of Company's Goodwill	The following table sets forth details of the Company’s goodwill balance as of September 30, 2016 : Operations Management Analytics Total Balance at January 1, 2015 $ 122,814 $ 16,785 $ 139,599 Goodwill arising from RPM acquisition — 33,155 33,155 Currency translation adjustments (1,219 ) — (1,219 ) Balance at December 31, 2015 $ 121,595 $ 49,940 $ 171,535 Goodwill arising from Liss acquisition 2,620 — 2,620 Goodwill arising from IQR acquisition — 3,206 3,206 Currency translation adjustments (268 ) — (268 ) Balance at September 30, 2016 $ 123,947 $ 53,146 $ 177,093
Summary of Company's Intangible Assets	Information regarding the Company’s intangible assets is set forth below: As of September 30, 2016 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Customer relationships $ 68,957 $ (30,230 ) $ 38,727 Developed technology 13,747 (5,911 ) 7,836 Trade names and trademarks 5,892 (3,129 ) 2,763 Leasehold benefits 2,770 (2,243 ) 527 Non-compete agreements 2,045 (1,572 ) 473 $ 93,411 $ (43,085 ) $ 50,326 As of December 31, 2015 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Customer relationships $ 64,816 $ (24,215 ) $ 40,601 Developed technology 12,234 (4,363 ) 7,871 Trade names and trademarks 5,670 (2,683 ) 2,987 Leasehold benefits 2,789 (2,109 ) 680 Non-compete agreements 2,045 (1,451 ) 594 $ 87,554 $ (34,821 ) $ 52,733
Estimated Amortization of Intangible Assets	Estimated amortization of intangible assets during the year ending September 30, 2017 $ 11,552 2018 $ 11,245 2019 $ 11,019 2020 $ 4,950 2021 and thereafter $ 10,660

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2016
Fair Value Disclosures [Abstract]
Assets and Liabilities Measured at Fair Value	The following table sets forth the Company’s assets and liabilities that were accounted for at fair value as of September 30, 2016 and December 31, 2015 . The table excludes accounts receivable, accounts payable and accrued expenses for which fair values approximate their carrying amounts. As of September 30, 2016 Level 1 Level 2 Level 3 Total Assets Money market and mutual funds* $ 116,242 $ — $ — $ 116,242 Derivative financial instruments — 6,622 — 6,622 Total $ 116,242 $ 6,622 $ — $ 122,864 Liabilities Derivative financial instruments $ — $ 1,816 $ — $ 1,816 Contingent consideration 500 $ 500 Total $ — $ 1,816 $ 500 $ 2,316 As of December 31, 2015 Level 1 Level 2 Level 3 Total Assets Money market and mutual funds $ 118,478 $ — $ — $ 118,478 Derivative financial instruments — 4,184 — 4,184 Total $ 118,478 $ 4,184 $ — $ 122,662 Liabilities Derivative financial instruments $ — $ 2,358 $ — $ 2,358 Fair value of earn-out consideration — — 4,060 4,060 Total $ — $ 2,358 $ 4,060 $ 6,418 * Includes short-term investments carried on fair value option under ASC 825 of $103,069 as of September 30, 2016 .

Derivatives and Hedge Account31

Derivatives and Hedge Accounting (Tables)	9 Months Ended
	Sep. 30, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Summary of Fair Value of Foreign Currency Exchange Contracts	The following tables set forth the fair value of the foreign currency exchange contracts and their location on the unaudited consolidated financial statements: Derivatives designated as hedging instruments: September 30, 2016 December 31, 2015 Other current assets: Foreign currency exchange contracts $ 4,177 $ 2,664 Other assets: Foreign currency exchange contracts $ 2,377 $ 1,175 Accrued expenses and other current liabilities: Foreign currency exchange contracts $ 1,066 $ 1,226 Other non current liabilities: Foreign currency exchange contracts $ 719 $ 1,132 Derivatives not designated as hedging instruments: September 30, 2016 December 31, 2015 Other current assets: Foreign currency exchange contracts $ 68 $ 345 Accrued expenses and other current liabilities: Foreign currency exchange contracts $ 31 —
Summary of Effect of Foreign Currency Exchange Contracts on Consolidated Statements of Income	The following tables set forth the effect of foreign currency exchange contracts on the unaudited consolidated statements of income for the three months ended September 30, 2016 and 2015 : Derivatives in Cash Flow Hedging Relationships Amount of Gain/(Loss) Recognized in AOCI on Derivative (Effective Portion) Location of Gain/(Loss) Reclassified from AOCI into Income (Effective Portion) Amount of Gain/(Loss) Reclassified from AOCI into Income (Effective Portion) Location of Gain/(Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing) Amount of Gain/(Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing) 2016 2015 2016 2015 2016 2015 Foreign exchange contracts $ 3,607 $ (3,526 ) Foreign exchange gain/(loss) $ 466 $ (430 ) Foreign exchange gain/(loss) $ — $ — Derivatives not designated as Hedging Instruments Amount of Gain/(Loss) Recognized in Income on Derivatives Location of Gain or (Loss) Recognized in Income on Derivatives 2016 2015 Foreign exchange contracts Foreign exchange gain/(loss) $ 1,382 $ 705 The following tables set forth the effect of foreign currency exchange contracts on the unaudited consolidated statements of income for the nine months ended September 30, 2016 and 2015 : Derivatives in Cash Flow Hedging Relationships Amount of Gain/(Loss) Recognized in AOCI on Derivative (Effective Portion) Location of Gain/(Loss) Reclassified from AOCI into Income (Effective Portion) Amount of Gain/(Loss) Reclassified from AOCI into Income (Effective Portion) Location of Gain/(Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing) Amount of Gain/(Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing) 2016 2015 2016 2015 2016 2015 Foreign exchange contracts $ 4,160 $ (2,741 ) Foreign exchange gain/(loss) $ 872 $ (963 ) Foreign exchange gain/(loss) $ — $ — Derivatives not designated Amount of Gain/(Loss) Location of Gain or (Loss) Recognized in 2016 2015 Foreign exchange contracts Foreign exchange gain/(loss) $ 4,110 $ 94

Fixed Assets (Tables)

Fixed Assets (Tables)	9 Months Ended
	Sep. 30, 2016
Property, Plant and Equipment [Abstract]
Schedule of Fixed Assets	Fixed assets consist of the following: September 30, 2016 December 31, 2015 Owned Assets: Network equipment, computers and software $ 104,843 $ 95,245 Leasehold improvements 30,383 28,603 Office furniture and equipment 15,146 14,000 Capital work in progress 5,554 3,140 Buildings 1,194 1,202 Land 781 787 Motor vehicles 565 540 158,466 143,517 Less: Accumulated depreciation and amortization (109,869 ) (96,079 ) $ 48,597 $ 47,438 Assets under capital leases: Leasehold improvements $ 864 $ 877 Office furniture and equipment 127 136 Motor vehicles 743 806 1,734 1,819 Less: Accumulated depreciation and amortization (1,325 ) (1,266 ) $ 409 $ 553 Fixed assets, net $ 49,006 $ 47,991

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	9 Months Ended
	Sep. 30, 2016
Compensation and Retirement Disclosure [Abstract]
Net Gratuity Cost	Net gratuity cost includes the following components: Three months ended September 30, Nine months ended September 30, 2016 2015 2016 2015 Service cost $ 402 $ 403 $ 1,203 $ 1,241 Interest cost 150 135 449 417 Expected return on plan assets (104 ) (94 ) (312 ) (291 ) Actuarial loss 23 51 67 159 Net gratuity cost $ 471 $ 495 $ 1,407 $ 1,526
Change in Plan Assets	Change in Plan Assets Plan assets at January 1, 2016 $ 4,923 Actual return 328 Benefits paid (656 ) Effect of exchange rate changes (36 ) Plan assets at September 30, 2016 $ 4,559

Leases (Tables)

Leases (Tables)	9 Months Ended
	Sep. 30, 2016
Leases [Abstract]
Future Minimum Lease Payments under Capital Leases	Future minimum lease payments under these capital leases as of September 30, 2016 are as follows: Year ending September 30, 2017 $ 282 2018 135 2019 80 2020 34 Total minimum lease payments 531 Less: amount representing interest 80 Present value of minimum lease payments 451 Less: current portion 237 Long term capital lease obligation $ 214
Future Minimum Lease Payments under Non-Cancelable Operating Lease Agreements	Future minimum lease payments under non-cancellable agreements expiring after September 30, 2016 are set forth below: Year ending September 30, 2017 $ 9,936 2018 8,471 2019 6,622 2020 3,994 2021 2,535 2022 and thereafter 1,520 $ 33,078

Income Taxes (Tables)

Income Taxes (Tables)	9 Months Ended
	Sep. 30, 2016
Income Tax Disclosure [Abstract]
Summary of Activity Related to Gross Unrecognized Tax Benefits	The following table summarizes the activity related to the gross unrecognized tax benefits from January 1, 2016 through September 30, 2016 : Balance as of January 1, 2016 $ 2,797 Increases related to prior year tax positions — Decreases related to prior year tax positions — Increases related to current year tax positions — Decreases related to current year tax positions — Effect of exchange rate changes (12 ) Balance as of September 30, 2016 $ 2,785

Stock Based Compensation (Table

Stock Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Costs Related to Company's Stock-Based Compensation Plan	The following costs related to the Company’s stock-based compensation plan are included in the unaudited consolidated statements of income: Three months ended September 30, Nine months ended September 30, 2016 2015 2016 2015 Cost of revenue $ 795 $ 740 $ 2,848 $ 2,394 General and administrative expenses 1,905 1,613 6,241 4,482 Selling and marketing expenses 1,784 2,118 5,654 5,404 Total $ 4,484 $ 4,471 $ 14,743 $ 12,280
Stock Based Compensation Stock Option Activity	Stock option activity under the Company’s stock plans is shown below: Number of Weighted- Aggregate Weighted- Outstanding at December 31, 2015 1,210,141 $ 16.31 $ 34,638 3.50 Granted — — Exercised (386,739 ) 16.10 Forfeited — — Outstanding at September 30, 2016 823,402 $ 16.41 $ 27,530 3.05 Vested and exercisable at September 30, 2016 823,402 $ 16.41 $ 27,530 3.05
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock Activity Under Company's Stock Plans	Restricted stock and restricted stock unit activity under the Company’s stock plans is shown below: Restricted Stock Restricted Stock Units Number Weighted- Average Intrinsic Value Number Weighted- Average Intrinsic Value Outstanding at December 31, 2015* 134,935 $ 35.27 1,228,287 $ 30.06 Granted 33,459 52.41 420,403 48.83 Vested (15,057 ) 34.61 (335,022 ) 28.68 Forfeited — — (66,315 ) 32.23 Outstanding at September 30, 2016* 153,337 $ 39.08 1,247,353 $ 36.64 * As of September 30, 2016 and December 31, 2015 restricted stock units vested for which the underlying common stock is yet to be issued are 135,054 and 149,364 , respectively.
Performance Based Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock Activity Under Company's Stock Plans	Performance restricted stock unit (the "PRSU's") activity under the Company’s stock plans is shown below: Revenue Based PRSUs Market Condition Based PRSUs Number Weighted Avg Fair Value Number Weighted Avg Fair Value Outstanding at December 31, 2015 107,213 $ 30.88 207,212 $ 38.80 Granted 59,861 48.57 59,859 67.94 Vested — — — — Forfeited (5,600 ) 36.86 (5,600 ) 55.35 Outstanding at September 30, 2016* 161,474 $ 37.23 261,471 $ 45.12

Geographical Information (Table

Geographical Information (Tables)	9 Months Ended
	Sep. 30, 2016
Segment Reporting [Abstract]
Revenues Based on Geographical Information	The Company attributes the revenues to regions based upon location of its customers. Three months ended September 30, Nine months ended September 30, 2016 2015 2016 2015 Revenues, net United States $ 137,047 $ 129,886 $ 407,272 $ 364,591 United Kingdom 27,993 28,262 84,284 81,550 Rest of World 6,160 5,355 17,158 16,493 $ 171,200 $ 163,503 $ 508,714 $ 462,634
Fixed Assets, Net Based on Geographical Information	September 30, 2016 December 31, 2015 Fixed assets, net India $ 24,089 $ 23,415 United States 10,917 10,680 Philippines 10,811 11,285 Rest of World 3,189 2,611 $ 49,006 $ 47,991

Organization and Basis of Pre38

Organization and Basis of Presentation (Details) - operating_segment	3 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of operating segments merged	2	2

Summary of Significant Accoun39

Summary of Significant Accounting Policies - Schedule of Other Current Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Prepaid Expense and Other Assets, Current [Abstract]
Derivative instruments	$ 4,245	$ 3,009
Advances to suppliers	1,366	1,545
Receivables from statutory authorities	11,073	8,676
Others	2,032	1,989
Other current assets	$ 18,716	$ 15,219

Summary of Significant Accoun40

Summary of Significant Accounting Policies - Summary of Accrued Expenses and Other Current Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Payables and Accruals [Abstract]
Accrued expenses	$ 27,356	$ 26,238
Derivative instruments	1,097	1,226
Client liability	2,515	2,217
Other current liabilities	7,394	4,569
Accrued expenses and other current liabilities	$ 38,362	$ 34,250

Summary of Significant Accoun41

Summary of Significant Accounting Policies - Summary of Non-current Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Payables and Accruals [Abstract]
Derivative instruments	$ 719	$ 1,132
Unrecognized tax benefits	3,195	3,066
Deferred rent	6,308	6,515
Retirement benefits	1,398	1,441
Other non-current liabilities	1,585	5,501
Non-current liabilities	$ 13,205	$ 17,655

Summary of Significant Accoun42

Summary of Significant Accounting Policies - Summary of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' equity	$ 518,038	$ 465,592
Taxes on unrealized gain on cash flow hedges	1,370	662
Taxes on Retirement benefits	(174)	(201)
Cumulative currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' equity	(70,715)	(68,063)
Unrealized gain on cash flow hedges, net of taxes of $1,370 and $662
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' equity	3,404	824
Retirement benefits, net of taxes of ($174) and ($201)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' equity	387	(86)
Accumulated other comprehensive loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' equity	$ (66,924)	$ (67,325)

Summary of Significant Accoun43

Summary of Significant Accounting Policies - Summary of Other Income, net (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Other Nonoperating Income (Expense) [Abstract]
Interest and dividend income	$ 2,916	$ 2,085	$ 7,399	$ 4,997
Interest expense	(295)	(340)	(1,023)	(983)
Change in fair value of earn-out consideration	0	0	4,060	0
Other, net	(25)	42	738	286
Other income, net	2,596	1,787	11,174	4,300
Unrealized gain on investments	$ 1,971	$ 1,419	4,955	2,179
Change in fair value of earn-out consideration			$ (4,060)	$ 0

Earnings Per Share - Computatio

Earnings Per Share - Computation of Basic and Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Numerators:
Net income	$ 16,050	$ 15,162	$ 46,245	$ 36,803
Denominators:
Basic weighted average common shares outstanding (in shares)	33,624,401	33,307,312	33,542,258	33,320,477
Dilutive effect of share based awards (in shares)	1,051,084	873,323	970,557	826,643
Diluted weighted average common shares outstanding (in shares)	34,675,485	34,180,635	34,512,815	34,147,120
Earnings per share:
Basic (in dollars per share)	$ 0.48	$ 0.46	$ 1.38	$ 1.10
Diluted (in dollars per share)	$ 0.46	$ 0.44	$ 1.34	$ 1.08
Weighted average common shares considered anti-dilutive in computing diluted earnings per share (in shares)	32,516	61,738	97,574	98,527

Segment Information - Additiona

Segment Information - Additional Information (Detail) - operating_segment	3 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2015
Segment Reporting [Abstract]
Number of operating segments merged	2	2

Segment Information - Revenues

Segment Information - Revenues and Cost of Revenues for Company's Operations Management and Analytics and Business Transformation Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Revenues and cost of revenues for Company's outsourcing services and transformation services segments [Line Items]
Revenues, net	$ 171,200	$ 163,503	$ 508,714	$ 462,634
Cost of revenues (exclusive of depreciation and amortization)	111,767	103,198	332,172	296,801
Gross profit	59,433	60,305	176,542	165,833
Operating expenses	42,074	39,556	126,495	116,368
Foreign exchange gain and Other income, net	4,337	1,978	14,747	6,647
Income tax expense	5,646	7,565	18,549	19,309
Net income	16,050	15,162	46,245	36,803
Operations Management
Revenues and cost of revenues for Company's outsourcing services and transformation services segments [Line Items]
Revenues, net	129,563	128,043	388,502	376,943
Cost of revenues (exclusive of depreciation and amortization)	85,988	81,477	256,078	242,014
Gross profit	43,575	46,566	132,424	134,929
Analytics
Revenues and cost of revenues for Company's outsourcing services and transformation services segments [Line Items]
Revenues, net	41,637	35,460	120,212	85,691
Cost of revenues (exclusive of depreciation and amortization)	25,779	21,721	76,094	54,787
Gross profit	$ 15,858	$ 13,739	$ 44,118	$ 30,904

Business Combination, Goodwil47

Business Combination, Goodwill and Intangible Assets - Business Combination Additional Information (Details) - USD ($) $ in Thousands	Sep. 01, 2016	Jul. 01, 2016	Sep. 30, 2016	Sep. 30, 2016
Liss
Business Acquisition [Line Items]
Consideration transferred		$ 5,202
Working capital adjustments		$ (603)
Liss | Customer relationships
Business Acquisition [Line Items]
Weighted average useful life (in years)	8 years
Liss | Developed technology
Business Acquisition [Line Items]
Weighted average useful life (in years)	10 years
Liss | Trade names and trademarks
Business Acquisition [Line Items]
Weighted average useful life (in years)	5 years
IQR
Business Acquisition [Line Items]
Consideration transferred	$ 5,052
Working capital adjustments	652
Additional consideration	$ 500
IQR | Customer relationships
Business Acquisition [Line Items]
Weighted average useful life (in years)	8 years
Liss and IQR
Business Acquisition [Line Items]
Acquisition related costs			$ 403	$ 403
Revenue of acquirees since acquisition date			$ 1,098	$ 1,098
Restricted Stock | Liss
Business Acquisition [Line Items]
Restricted common stock issued (in shares)		33,459
Fair value of restricted common stock issued		$ 1,754
Restricted Stock | IQR
Business Acquisition [Line Items]
Restricted common stock issued (in shares)	21,987
Fair value of restricted common stock issued	$ 1,125

Business Combination, Goodwil48

Business Combination, Goodwill and Intangible Assets - Purchase Price Allocation (Details) - USD ($)	Sep. 30, 2016	Sep. 01, 2016	Jul. 01, 2016	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Goodwill	$ 177,093,000			$ 171,535,000	$ 139,599,000
Liss
Business Acquisition [Line Items]
Tangible liabilities			$ 498,000
Tangible liabilities			(993,000)
Deferred tax liability			(643,000)
Goodwill			2,620,000
Total purchase price			5,202,000
Liss | Customer relationships
Business Acquisition [Line Items]
Identifiable intangible assets			1,918,000
Liss | Developed technology
Business Acquisition [Line Items]
Identifiable intangible assets			1,571,000
Liss | Trade names and trademarks
Business Acquisition [Line Items]
Identifiable intangible assets			$ 231,000
IQR
Business Acquisition [Line Items]
Tangible liabilities		$ 1,438,000
Tangible liabilities		(527,000)
Deferred tax liability		(865,000)
Goodwill		3,206,000
Total purchase price		5,552,000
IQR | Customer relationships
Business Acquisition [Line Items]
Identifiable intangible assets		$ 2,300,000

Business Combination, Goodwil49

Business Combination, Goodwill and Intangible Assets - Summary of Company's Goodwill (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Goodwill [Roll Forward]
Beginning Balance	$ 171,535	$ 139,599
Currency translation adjustments	(268)	(1,219)
Ending Balance	177,093	171,535
RPM Direct LLC and RPM Data Solutions LLC
Goodwill [Roll Forward]
Goodwill arising from acquisition		33,155
Liss
Goodwill [Roll Forward]
Goodwill arising from acquisition	2,620
IQR
Goodwill [Roll Forward]
Goodwill arising from acquisition	3,206
Operations Management
Goodwill [Roll Forward]
Beginning Balance	121,595	122,814
Currency translation adjustments	(268)	(1,219)
Ending Balance	123,947	121,595
Operations Management | RPM Direct LLC and RPM Data Solutions LLC
Goodwill [Roll Forward]
Goodwill arising from acquisition		0
Operations Management | Liss
Goodwill [Roll Forward]
Goodwill arising from acquisition	2,620
Operations Management | IQR
Goodwill [Roll Forward]
Goodwill arising from acquisition	0
Analytics
Goodwill [Roll Forward]
Beginning Balance	49,940	16,785
Ending Balance	53,146	49,940
Analytics | RPM Direct LLC and RPM Data Solutions LLC
Goodwill [Roll Forward]
Goodwill arising from acquisition		$ 33,155
Analytics | Liss
Goodwill [Roll Forward]
Goodwill arising from acquisition	0
Analytics | IQR
Goodwill [Roll Forward]
Goodwill arising from acquisition	$ 3,206

Business Combination, Goodwil50

Business Combination, Goodwill and Intangible Assets - Summary of Company's Intangible Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 93,411	$ 87,554
Accumulated Amortization	(43,085)	(34,821)
Net Carrying Amount	50,326	52,733
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	68,957	64,816
Accumulated Amortization	(30,230)	(24,215)
Net Carrying Amount	38,727	40,601
Developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	13,747	12,234
Accumulated Amortization	(5,911)	(4,363)
Net Carrying Amount	7,836	7,871
Trade names and trademarks
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	5,892	5,670
Accumulated Amortization	(3,129)	(2,683)
Net Carrying Amount	2,763	2,987
Leasehold benefits
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,770	2,789
Accumulated Amortization	(2,243)	(2,109)
Net Carrying Amount	527	680
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,045	2,045
Accumulated Amortization	(1,572)	(1,451)
Net Carrying Amount	$ 473	$ 594

Business Combination, Goodwil51

Business Combination, Goodwill and Intangible Assets - Goodwill and Intangible Assets Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 2,848	$ 2,642	$ 8,281	$ 7,509
Indefinite lived trade names and trademarks	$ 900		$ 900		$ 900
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Remaining amortization period (in years)			6 years
Developed technology
Acquired Finite-Lived Intangible Assets [Line Items]
Remaining amortization period (in years)			5 years 1 month 6 days
Trade names and trademarks
Acquired Finite-Lived Intangible Assets [Line Items]
Remaining amortization period (in years)			5 years 9 months 18 days
Leasehold benefits
Acquired Finite-Lived Intangible Assets [Line Items]
Remaining amortization period (in years)			2 years 8 months 12 days
Non-compete agreements
Acquired Finite-Lived Intangible Assets [Line Items]
Remaining amortization period (in years)			2 years 9 months 18 days

Business Combination, Goodwil52

Business Combination, Goodwill and Intangible Assets - Estimated Amortization of Intangible Assets (Detail) $ in Thousands	Sep. 30, 2016USD ($)
Business Combinations [Abstract]
2,017	$ 11,552
2,018	11,245
2,019	11,019
2,020	4,950
2021 and thereafter	$ 10,660

Fair Value Measurements - Asset

Fair Value Measurements - Assets and Liabilities Measured at Fair Value (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Liabilities
Fair value of earn-out consideration	$ 0	$ 4,060
Investments carried at fair value	103,069
Recurring
Assets
Money market and mutual funds	116,242	118,478
Derivative financial instruments	6,622	4,184
Total	122,864	122,662
Liabilities
Derivative financial instruments	1,816	2,358
Contingent consideration	500
Fair value of earn-out consideration		4,060
Total	2,316	6,418
Recurring | Level 1
Assets
Money market and mutual funds	116,242	118,478
Derivative financial instruments		0
Total	116,242	118,478
Liabilities
Derivative financial instruments	0	0
Contingent consideration
Fair value of earn-out consideration		0
Total	0	0
Recurring | Level 2
Assets
Money market and mutual funds	0	0
Derivative financial instruments	6,622	4,184
Total	6,622	4,184
Liabilities
Derivative financial instruments	1,816	2,358
Contingent consideration
Fair value of earn-out consideration		0
Total	1,816	2,358
Recurring | Level 3
Assets
Money market and mutual funds	0	0
Derivative financial instruments	0	0
Total	0	0
Liabilities
Derivative financial instruments	0	0
Contingent consideration	500
Fair value of earn-out consideration		4,060
Total	500	$ 4,060
IQR
Liabilities
Contingent consideration	$ 1,000

Derivatives and Hedge Account54

Derivatives and Hedge Accounting - Additional Information (Detail) £ in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016USD ($)	Sep. 30, 2015USD ($)	Sep. 30, 2016USD ($)	Sep. 30, 2015USD ($)	Sep. 30, 2016GBP (£)	Dec. 31, 2015USD ($)	Dec. 31, 2015GBP (£)
Derivative Instruments, Gain (Loss) [Line Items]
Net derivative losses which could be reclassified into earnings within the next 12 months			$ 3,111
Maximum outstanding term of cash flow hedges (in months)			45 months
Gain/(losses) that reclassified from AOCI into earning for discontinued hedging transactions	$ 0	$ 0	$ 0	$ 0
Derivatives Designated as Hedging Instruments | Derivatives in Cash Flow Hedging Relationships | Foreign Currency Exchange Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Foreign exchange contracts outstanding	221,295		221,295			$ 230,894
Derivatives Designated as Hedging Instruments | Derivatives in Cash Flow Hedging Relationships | Forward Exchange Forward
Derivative Instruments, Gain (Loss) [Line Items]
Foreign exchange contracts outstanding	2,550		2,550
Derivatives not Designated as Hedging Instruments | Foreign Currency Exchange Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Foreign exchange contracts outstanding	$ 62,198		$ 62,198		£ 18,519	$ 61,641	£ 13,256

Derivatives and Hedge Account55

Derivatives and Hedge Accounting - Summary of Fair Value of Foreign Currency Exchange Contracts (Detail) - Foreign Currency Exchange Contracts - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Derivatives Designated as Hedging Instruments | Other current assets
Derivatives, Fair Value [Line Items]
Foreign currency exchange contracts, asset	$ 4,177	$ 2,664
Derivatives Designated as Hedging Instruments | Other assets
Derivatives, Fair Value [Line Items]
Foreign currency exchange contracts, asset	2,377	1,175
Derivatives Designated as Hedging Instruments | Accrued expenses and other current liabilities
Derivatives, Fair Value [Line Items]
Foreign currency exchange contracts, liability	1,066	1,226
Derivatives Designated as Hedging Instruments | Other non current liabilities
Derivatives, Fair Value [Line Items]
Foreign currency exchange contracts, liability	719	1,132
Derivatives not Designated as Hedging Instruments | Other current assets
Derivatives, Fair Value [Line Items]
Foreign currency exchange contracts, asset	68	345
Derivatives not Designated as Hedging Instruments | Accrued expenses and other current liabilities
Derivatives, Fair Value [Line Items]
Foreign currency exchange contracts, liability	$ 31	$ 0

Derivatives and Hedge Account56

Derivatives and Hedge Accounting - Summary of Effect of Foreign Currency Exchange Contracts on Consolidated Statements of Income (Detail) - Foreign Currency Exchange Contracts - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Derivatives Designated as Hedging Instruments | Derivatives in Cash Flow Hedging Relationships
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain/(Loss) Recognized in AOCI on Derivative (Effective Portion)	$ 3,607	$ (3,526)	$ 4,160	$ (2,741)
Foreign exchange gain/(loss) | Derivatives Designated as Hedging Instruments | Derivatives in Cash Flow Hedging Relationships
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain/(Loss) Reclassified from AOCI into Income (Effective Portion)	466	(430)	872	(963)
Amount of Gain/(Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)	0	0	0	0
Foreign exchange gain/(loss) | Derivatives not Designated as Hedging Instruments
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain/(Loss) Recognized in Income on Derivatives	$ 1,382	$ 705	$ 4,110	$ 94

Fixed Assets - Schedule of Fixe

Fixed Assets - Schedule of Fixed Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Owned Assets:
Owned Assets, gross	$ 158,466	$ 143,517
Less: Accumulated depreciation and amortization	(109,869)	(96,079)
Owned Assets, net	48,597	47,438
Assets under capital leases:
Assets under capital leases, gross	1,734	1,819
Less: Accumulated depreciation and amortization	(1,325)	(1,266)
Assets under capital leases, net	409	553
Fixed assets, net	49,006	47,991
Network equipment, computers and software
Owned Assets:
Owned Assets, gross	104,843	95,245
Leasehold improvements
Owned Assets:
Owned Assets, gross	30,383	28,603
Assets under capital leases:
Assets under capital leases, gross	864	877
Office furniture and equipment
Owned Assets:
Owned Assets, gross	15,146	14,000
Assets under capital leases:
Assets under capital leases, gross	127	136
Capital work in progress
Owned Assets:
Owned Assets, gross	5,554	3,140
Buildings
Owned Assets:
Owned Assets, gross	1,194	1,202
Land
Owned Assets:
Owned Assets, gross	781	787
Motor vehicles
Owned Assets:
Owned Assets, gross	565	540
Assets under capital leases:
Assets under capital leases, gross	$ 743	$ 806

Fixed Assets - Additional Infor

Fixed Assets - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Property, Plant and Equipment [Abstract]
Depreciation and amortization expense	$ 5,749	$ 5,415	$ 16,719	$ 15,662

Capital Structure - Additional

Capital Structure - Additional Information (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2016USD ($)$ / sharesshares	Sep. 30, 2015USD ($)$ / sharesshares	Sep. 30, 2016USD ($)ClassOfCommonStock$ / sharesshares	Sep. 30, 2015USD ($)$ / sharesshares	Dec. 30, 2014USD ($)
Equity, Class of Treasury Stock [Line Items]
Number of classes of common stock outstanding | ClassOfCommonStock			1
Acquisition of restricted stock from employees in connection with withholding tax payments (in shares) | shares	0	0	16,027	13,573
Withholding tax payments related to the vesting of restricted stock for total consideration			$ 728,000	$ 421,000
Weighted average purchase price per share prior to the vesting date (in dollars per share) | $ / shares			$ 45.44	$ 30.99
2014 Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Repurchase of common stock authorized by board of directors up to					$ 20,000,000
Stock repurchase program, period start (year)			2,015
Stock repurchase program, period end (year)			2,017
Common stock shares purchased under the repurchase program (in shares) | shares	108,143	220,579	302,953	354,448
Common stock aggregate purchase price including commissions	$ 5,466,000	$ 8,149,000	$ 14,441,000	$ 12,834,000
Common stock average purchase price per share (in dollars per share) | $ / shares	$ 50.54	$ 36.94	$ 47.67	$ 36.21

Borrowings - Additional Informa

Borrowings - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Dec. 31, 2015	Oct. 24, 2014
Credit Facilities [Line Items]
Other short-term borrowings	$ 5,000,000		$ 5,000,000	$ 10,000,000
Revolving Credit Facility
Credit Facilities [Line Items]
Revolving credit facility	45,000,000		$ 45,000,000	70,000,000	$ 100,000,000
Credit facility expiration date			Oct. 24, 2019
Other short-term borrowings	$ 5,000,000		$ 5,000,000
Line of credit interest rate during period (as a percent)	1.95%	1.56%
Unamortized debt issuance costs	$ 296,000		$ 296,000	$ 368,000

Employee Benefit Plans - Net Gr

Employee Benefit Plans - Net Gratuity Cost (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Compensation and Retirement Disclosure [Abstract]
Service cost	$ 402	$ 403	$ 1,203	$ 1,241
Interest cost	150	135	449	417
Expected return on plan assets	(104)	(94)	(312)	(291)
Actuarial loss	23	51	67	159
Net gratuity cost	$ 471	$ 495	$ 1,407	$ 1,526

Employee Benefit Plans - Change

Employee Benefit Plans - Change in Plan Assets (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2016USD ($)
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at January 1, 2016	$ 4,923
Actual return	328
Benefits paid	(656)
Effect of exchange rate changes	(36)
Plan assets at September 30, 2016	$ 4,559

Employee Benefit Plans - Additi

Employee Benefit Plans - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Mar. 31, 2016	Mar. 31, 2015
Compensation and Retirement Disclosure [Abstract]
Expected return on plan assets (as a percent)					9.00%	9.00%
Percentage of discretionary contributions towards 401(k) Plan, maximum (as a percent)			3.00%	3.00%
Company's contribution to the 401(k) Plan	$ 554	$ 400	$ 1,945	$ 1,551
Contribution to various defined contribution plans	$ 1,608	$ 1,463	$ 4,619	$ 4,393

Leases - Future Minimum Lease P

Leases - Future Minimum Lease Payments under Capital Leases (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Leases [Abstract]
2,017	$ 282
2,018	135
2,019	80
2,020	34
Total minimum lease payments	531
Less: amount representing interest	80
Present value of minimum lease payments	451
Less: current portion	237	$ 384
Long term capital lease obligation	$ 214	$ 278

Leases - Future Minimum Lease65

Leases - Future Minimum Lease Payments under Non-Cancelable Operating Lease Agreements Expiring After December 31, 2014 (Detail) $ in Thousands	Sep. 30, 2016USD ($)
Leases [Abstract]
2,017	$ 9,936
2,018	8,471
2,019	6,622
2,020	3,994
2,021	2,535
2022 and thereafter	1,520
Total operating lease payments	$ 33,078

Leases - Additional Information

Leases - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Leases [Abstract]
Rent expense under both cancelable and non-cancelable operating leases	$ 5,445	$ 4,994	$ 15,871	$ 15,089
Deferred rent	$ 7,828		$ 7,828		$ 7,066

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Income tax expense	$ 5,646	$ 7,565	$ 18,549	$ 19,309
Effective tax rates (as a percent)	26.00%	33.30%	28.60%	34.40%
Increase in unrecognized tax benefit		$ 600		$ 2,400
Income tax reconciliation, reversal of non-taxable earn-out liability			$ 4,060
Unrecognized tax benefits	$ 2,785		2,785		$ 2,797
Recognized interest and penalties	50	$ 74
Accrued interest on unrecognized tax benefits	$ 1,410		$ 1,410		$ 1,269

Income Taxes - Summary of Activ

Income Taxes - Summary of Activity Related to Gross Unrecognized Tax Benefits (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2016USD ($)
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance as of January 1, 2016	$ 2,797
Increases related to prior year tax positions	0
Decreases related to prior year tax positions	0
Increases related to current year tax positions	0
Decreases related to current year tax positions	0
Effect of exchange rate changes	(12)
Balance as of September 30, 2016	$ 2,785

Stock Based Compensation - Cost

Stock Based Compensation - Costs Related to Company's Stock-Based Compensation Plan (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expenses	$ 4,484	$ 4,471	$ 14,743	$ 12,280
Cost of revenue
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expenses	795	740	2,848	2,394
General and administrative expenses
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expenses	1,905	1,613	6,241	4,482
Selling and marketing expenses
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expenses	$ 1,784	$ 2,118	$ 5,654	$ 5,404

Stock Based Compensation - Addi

Stock Based Compensation - Additional Information (Detail)	Sep. 30, 2016shares
2015 Stock Options Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant (in shares)	1,967,539

Stock Based Compensation - Stoc

Stock Based Compensation - Stock Option Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of Options, Granted (in shares)	0	0	0	0
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of Options, Outstanding, at December 31, 2015 (in shares)			1,210,141
Number of Options, Granted (in shares)			0
Number of Options, Exercised (in shares)			(386,739)
Number of Options, Forfeited (in shares)			0
Number of Options, Outstanding, at September 30, 2016 (in shares)	823,402		823,402		1,210,141
Number of Options, Vested and exercisable at September 30, 2016 (in shares)	823,402		823,402
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted-Average Exercise Price, Outstanding, at December 31, 2015 (in dollars per share)			$ 16.31
Weighted-Average Exercise Price, Granted (in dollars per share)			0
Weighted-Average Exercise Price, Exercised (in dollars per share)			16.10
Weighted-Average Exercise Price, Forfeited (in dollars per share)			0
Weighted-Average Exercise Price, Outstanding, at September 30, 2016 (in dollars per share)	$ 16.41		16.41		$ 16.31
Weighted Average Exercise Price, Vested and exercisable at September 30, 2016 (in dollars per share)	$ 16.41		$ 16.41
Aggregate Intrinsic Value, Outstanding	$ 27,530		$ 27,530		$ 34,638
Weighted-Average Remaining Contractual Life (in years)			3 years 18 days		3 years 6 months
Aggregate Intrinsic Value, Vested and exercisable at September 30, 2016	$ 27,530		$ 27,530
Weighted-Average Remaining Contractual Life, Vested and exercisable at September 30, 2016 (in years)			3 years 18 days

Stock Based Compensation - St72

Stock Based Compensation - Stock Options Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted (in shares)	0	0	0	0
Number of shares vested (in shares)	0	0
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee service share-based compensation, nonvested awards, compensation not yet recognized, stock options	$ 0		$ 0
Number of shares granted (in shares)			0
Total grant date fair value of option vested in period			$ 706	$ 1,170

Stock Based Compensation - Rest

Stock Based Compensation - Restricted Stock Activity Under Company's Stock Plans (Detail) - $ / shares	9 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Number, Outstanding, at December 31, 2015 (in shares)	134,935
Number, Granted (in shares)	33,459
Number, Vested (in shares)	(15,057)
Number, Forfeited (in shares)	0
Number, Outstanding, at September 30, 2016 (in shares)	153,337
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted-Average Fair Value, Outstanding, at December 31, 2015 (in dollars per share)	$ 35.27
Weighted-Average Fair Value, Granted (in dollars per share)	52.41
Weighted-Average Fair Value, Vested (in dollars per share)	34.61
Weighted-Average Fair Value, Forfeited (in dollars per share)	0
Weighted-Average Fair Value, Outstanding, at September 30, 2016 (in dollars per share)	$ 39.08
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Number, Outstanding, at December 31, 2015 (in shares)	1,228,287
Number, Granted (in shares)	420,403
Number, Vested (in shares)	(335,022)
Number, Forfeited (in shares)	(66,315)
Number, Outstanding, at September 30, 2016 (in shares)	1,247,353
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted-Average Fair Value, Outstanding, at December 31, 2015 (in dollars per share)	$ 30.06
Weighted-Average Fair Value, Granted (in dollars per share)	48.83
Weighted-Average Fair Value, Vested (in dollars per share)	28.68
Weighted-Average Fair Value, Forfeited (in dollars per share)	32.23
Weighted-Average Fair Value, Outstanding, at September 30, 2016 (in dollars per share)	$ 36.64
Restricted stock units vested (in shares)	135,054	149,364

Stock Based Compensation - Re74

Stock Based Compensation - Restricted Stock and RSU Additional Information (Details) - Restricted Stock and Restricted Stock Units $ in Thousands	9 Months Ended
	Sep. 30, 2016USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	$ 40,077
Cost not yet recognized, period for recognition (in years)	2 years 8 months 5 days

Stock Based Compensation - Perf

Stock Based Compensation - Performance Restricted Stock Activity (Details)	9 Months Ended
	Sep. 30, 2016$ / sharesshares
Revenue Based PRSUs
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Number, Outstanding, at December 31, 2015 (in shares) | shares	107,213
Number, Granted (in shares) | shares	59,861
Number, Vested (in shares) | shares	0
Number, Forfeited (in shares) | shares	(5,600)
Number, Outstanding, at September 30, 2016 (in shares) | shares	161,474
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted-Average Fair Value, Outstanding, at December 31, 2015 (in dollars per share) | $ / shares	$ 30.88
Weighted-Average Fair Value, Granted (in dollars per share) | $ / shares	48.57
Weighted-Average Fair Value, Vested (in dollars per share) | $ / shares	0
Weighted-Average Fair Value, Forfeited (in dollars per share) | $ / shares	36.86
Weighted-Average Fair Value, Outstanding, at September 30, 2016 (in dollars per share) | $ / shares	$ 37.23
Market Condition Based PRSUs
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Number, Outstanding, at December 31, 2015 (in shares) | shares	207,212
Number, Granted (in shares) | shares	59,859
Number, Vested (in shares) | shares	0
Number, Forfeited (in shares) | shares	(5,600)
Number, Outstanding, at September 30, 2016 (in shares) | shares	261,471
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted-Average Fair Value, Outstanding, at December 31, 2015 (in dollars per share) | $ / shares	$ 38.80
Weighted-Average Fair Value, Granted (in dollars per share) | $ / shares	67.94
Weighted-Average Fair Value, Vested (in dollars per share) | $ / shares	0
Weighted-Average Fair Value, Forfeited (in dollars per share) | $ / shares	55.35
Weighted-Average Fair Value, Outstanding, at September 30, 2016 (in dollars per share) | $ / shares	$ 45.12

Stock Based Compensation - Pe76

Stock Based Compensation - Performance Based Stock Awards Additional Information (Details) - Performance Based Stock Awards $ in Thousands	9 Months Ended
	Sep. 30, 2016USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	$ 10,426
Cost not yet recognized, period for recognition (in years)	1 year 8 months 27 days

Geographical Information - Reve

Geographical Information - Revenues Based on Geographical Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Revenues, net
Revenues, net	$ 171,200	$ 163,503	$ 508,714	$ 462,634
United States
Revenues, net
Revenues, net	137,047	129,886	407,272	364,591
United Kingdom
Revenues, net
Revenues, net	27,993	28,262	84,284	81,550
Rest of World
Revenues, net
Revenues, net	$ 6,160	$ 5,355	$ 17,158	$ 16,493

Geographical Information - Fixe

Geographical Information - Fixed Assets, Net Based on Geographical Information (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Fixed assets, net
Fixed assets, net	$ 49,006	$ 47,991
India
Fixed assets, net
Fixed assets, net	24,089	23,415
United States
Fixed assets, net
Fixed assets, net	10,917	10,680
Philippines
Fixed assets, net
Fixed assets, net	10,811	11,285
Rest of World
Fixed assets, net
Fixed assets, net	$ 3,189	$ 2,611

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Purchase commitments, net of advances	$ 6,400
Export-oriented units established (as a percent)	100.00%
Transfer pricing issues starting period (year)	2,003
Transfer pricing issues ending period (year)	2,013
Permanent establishment issues starting period (year)	2,003
Permanent establishment issues ending period (year)	2,007
Aggregate disputed amount related to transfer pricing and permanent establishment	$ 20,540	$ 21,360
Total bank guarantees and deposits in respect of contingencies	14,563	14,668
Amounts paid as deposits in respect of contingencies	12,574	12,665
Bank guarantee issued	$ 1,989	$ 2,003

Subsequent Event Subsequent Eve

Subsequent Event Subsequent Event (Details) - Datasource - Subsequent Event $ in Thousands	Oct. 21, 2016USD ($)
Restricted Stock
Subsequent Event [Line Items]
Fair value of restricted common stock issued	$ 4,700
ExlService.com LLC
Subsequent Event [Line Items]
Consideration transferred	$ 18,800