Schedule of Condensed Consolidated Statements of Comprehensive Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Condensed Financial Statements, Captions [Line Items]
Net Income (loss) attributable to iGATE common shareholders	$ 22,101	$ 5,377	$ 49,246	$ 22,352
Add: Non controlling interest	0	0	0	4,476
Other comprehensive income:
Change in fair value on marketable securities	(4,040)	1,529	(6,750)	1,466
Unrecognized actuarial gain (loss) on pension liability	257	(313)	570	(266)
Change in fair value of cash flow hedges	(6,974)	(3,100)	(3,935)	9,354
Loss on foreign currency translation	(89,390)	(119,153)	(72,007)	(61,467)
Total comprehensive income (loss)	(78,046)	(115,660)	(32,876)	(24,085)
Less: Total comprehensive income attributable to non controlling interest	0	0	0	4,476
Total comprehensive income (loss) attributable to iGATE common shareholders	(78,046)	(115,660)	(32,876)	(28,561)
Issuer
Condensed Financial Statements, Captions [Line Items]
Net Income (loss) attributable to iGATE common shareholders	(9,456)	10,055	(18,592)	(17,153)
Add: Non controlling interest	0	0	0	0
Other comprehensive income:
Change in fair value on marketable securities	0	0	0	0
Unrecognized actuarial gain (loss) on pension liability	0	0	0	0
Change in fair value of cash flow hedges	0	0	0	0
Loss on foreign currency translation	0	0	0	0
Total comprehensive income (loss)	(9,456)	10,055	(18,592)	(17,153)
Less: Total comprehensive income attributable to non controlling interest	0	0	0	0
Total comprehensive income (loss) attributable to iGATE common shareholders	(9,456)	10,055	(18,592)	(17,153)
Guarantors
Condensed Financial Statements, Captions [Line Items]
Net Income (loss) attributable to iGATE common shareholders	8,811	1,139	12,989	1,880
Add: Non controlling interest	0	0	0	0
Other comprehensive income:
Change in fair value on marketable securities	0	0	0	0
Unrecognized actuarial gain (loss) on pension liability	0	0	0	0
Change in fair value of cash flow hedges	0	0	0	0
Loss on foreign currency translation	0	0	0	0
Total comprehensive income (loss)	8,811	1,139	12,989	1,880
Less: Total comprehensive income attributable to non controlling interest	0	0	0	0
Total comprehensive income (loss) attributable to iGATE common shareholders	8,811	1,139	12,989	1,880
Non-Guarantors
Condensed Financial Statements, Captions [Line Items]
Net Income (loss) attributable to iGATE common shareholders	22,746	(5,817)	54,849	37,625
Add: Non controlling interest	0	0	0	4,476
Other comprehensive income:
Change in fair value on marketable securities	(4,040)	1,529	(6,750)	1,466
Unrecognized actuarial gain (loss) on pension liability	257	(313)	570	(266)
Change in fair value of cash flow hedges	(6,974)	(3,100)	(3,935)	9,354
Loss on foreign currency translation	(89,390)	(119,153)	(72,007)	(61,467)
Total comprehensive income (loss)	(77,401)	(126,854)	(27,273)	(8,812)
Less: Total comprehensive income attributable to non controlling interest	0	0	0	4,476
Total comprehensive income (loss) attributable to iGATE common shareholders	(77,401)	(126,854)	(27,273)	(13,288)
Eliminations
Condensed Financial Statements, Captions [Line Items]
Net Income (loss) attributable to iGATE common shareholders	0	0	0	0
Add: Non controlling interest	0	0	0	0
Other comprehensive income:
Change in fair value on marketable securities	0	0	0	0
Unrecognized actuarial gain (loss) on pension liability	0	0	0	0
Change in fair value of cash flow hedges	0	0	0	0
Loss on foreign currency translation	0	0	0	0
Total comprehensive income (loss)	0	0	0	0
Less: Total comprehensive income attributable to non controlling interest	0	0	0	0
Total comprehensive income (loss) attributable to iGATE common shareholders	$ 0	$ 0	$ 0	$ 0