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Business Acquisitions and Divestures - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended		12 Months Ended		1 Months Ended		6 Months Ended	1 Months Ended		1 Months Ended	9 Months Ended	1 Months Ended	6 Months Ended			1 Months Ended	6 Months Ended	1 Months Ended	3 Months Ended	1 Months Ended	9 Months Ended	1 Months Ended	9 Months Ended	1 Months Ended	9 Months Ended	1 Months Ended	9 Months Ended	1 Months Ended
	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Dec. 31, 2011	Feb. 22, 2013 Hello Communications (Shanghai) Co., Ltd.	Sep. 13, 2013 Clearbizz B.V.	Jun. 30, 2013 Gantthead.com, Inc	Feb. 06, 2013 Jawood Business Process Solutions, LLC	Feb. 06, 2013 Felix Software Solutions Private Limited	Feb. 06, 2013 Jawood Business Process Solutions, LLC and Felix Software Solutions Private Limited	Sep. 30, 2013 Jawood Business Process Solutions, LLC and Felix Software Solutions Private Limited	Sep. 04, 2012 Atyati Technologies Private Limited	Jun. 30, 2013 Atyati Technologies Private Limited	Jun. 30, 2013 Atyati Technologies Private Limited Deferred Tax Asset	Jun. 30, 2013 Atyati Technologies Private Limited Other Noncurrent Assets	Aug. 17, 2012 Triumph Engineering Corporation and Triumph On-Demand Inc	Jun. 30, 2013 Triumph Engineering Corporation and Triumph On-Demand Inc	Apr. 25, 2012 Accounting Plaza B.V. ("Accounting Plaza")	Mar. 31, 2013 Accounting Plaza B.V. ("Accounting Plaza")	Mar. 28, 2013 NGEN Media Services Private Limited	Sep. 30, 2013 NGEN Media Services Private Limited	Mar. 14, 2011 Akritiv Technologies, Inc.	Sep. 30, 2013 Akritiv Technologies, Inc.	Aug. 24, 2011 High Performance Partners LLC	Sep. 30, 2013 High Performance Partners LLC	Oct. 03, 2011 Empower Research, LLC	Sep. 30, 2013 Empower Research, LLC	Aug. 30, 2013 Third Pillar System Inc
Business Acquisition [Line Items]
Enterprise value							$ 1		$ 51,000	$ 2,295			$ 19,368				$ 3,600		$ 38,698		$ 158								$ 2,500
Held back amount																													225
Intangible assets estimated weighted average useful life											6 years		7 years				8 years		7 years										8 years
Percent ownership interest acquired									100.00%	100.00%			100.00%				100.00%		100.00%		100.00%
Business acquisition, date									Feb. 06, 2013				Sep. 04, 2012				Aug. 17, 2012		Apr. 25, 2012		Mar. 28, 2013		Mar. 14, 2011		Aug. 24, 2011		Oct. 03, 2011
Percent ownership held, before acquisition																					50.00%	50.00%
Business acquisition, loss on re-measurement from equity interest to fair value																						5
Cash and cash equivalents											1,364	1,364	2,000				312		1,664		432
Increase (decrease) in goodwill		(362)		(3,213)								(1,089)		633				(13)		107
Seller expenses											1,379	1,379
Payment for business acquisitions, net of cash acquired		49,235	53,931									47,212
Goodwill deductible for tax purposes	39,260	39,260		6,779							32,656
Acquisition date discounted value of deferred consideration													2,539				379
Contingent earn-out component-Low end													0				0
Contingent earn-out component-High end													14,372				4,500
Acquisition date fair value of earn-out consideration													1,487				3,256
Increase (decrease) in asset due to measurement period adjustment															(827)	194
Goodwill	950,424	950,424		956,064	925,339						34,826		13,939				4,504		25,549										2,003
Fair value of trade receivables acquired in business combination																			9,744
Gross amount of trade receivables acquired in business combination																			9,917
Trade receivables uncollectible amount																			173
Business Acquisition contingent consideration payment		3,868	587																					3,274		85		1,499
Payment of deferred consideration																												811
Cash consideration						998
Loss on sale						447	1,184
Balance of cash & cash equivalents						2,047
Proceeds from divestiture of business, net of cash divested (refer note 3C(a))		(1,049)				(1,049)
Provision for loss on divestiture	$ (141)	$ 3,520						$ 2,336

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Amount of cash payments resulting from the contingent consideration arrangement.

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Acquisition date present value of the deferred consideration to be paid in a business combination.

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Value assigned to an entity in a business combination which will be subject to certain adjustments such as working capital changes, cash and cash equivalents, funded indebtedness, seller's transaction expense liabilities etc. for determining the purchase consideration.

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Amount of outstanding liability of seller for costs of the effecting business combination including legal, accounting, and other costs as agreed between the acquirer and acquiree.

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Amount of consideration held back and not paid cash by acquirer as per the agreement between acquirer and acquiree in a business combination.

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Expected loss from proposed sale or disposal of an organization or integrated set of activities (for example, but not limited to, a partnership or corporation) engaged in providing a product or service in a commercial, industrial, or professional environment.

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It represents the measurement period adjustment to the value of assets acquired in a business combination.

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Amount of deferred consideration in business combination as per the acquisition agreement, paid during the reporting period

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Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format.

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes.

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For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the best estimate at the acquisition date of the contractual cash flows not expected to be collected, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables.

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For contingent consideration arrangements and indemnification assets recognized in connection with a business combination, this element represents an estimate of the low-end of the potential range (undiscounted) of the consideration which may be paid.

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Amount of liability recognized arising from contingent consideration in a business combination.

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Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Percentage of equity in the acquiree held by the acquirer immediately before the acquisition date in a business combination.

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In a business combination achieved in stages, this element represents the amount of net gain (loss) recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination.

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Reduction in cash due to no longer including the former subsidiary's cash in the consolidated entity's cash.

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Gain (loss) from sale or disposal of an organization or integrated set of activities (for example, but not limited to, a partnership or corporation) engaged in providing a product or service in a commercial, industrial, or professional environment.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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Aggregate cash proceeds received from a combination of transactions in which noncurrent assets are sold, which may include the sale of a business, an investment in an affiliate (including an equity method investee), property, plant and equipment and intangible assets. Excludes sales of trading, available-for-sale, and held-to-maturity securities.

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