REVENUES BY SERVICE OFFERING (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Revenue from External Customer [Line Items]
Revenues	$ 133,184	$ 103,800	$ 257,382	$ 198,183
Software development [Member]
Revenue from External Customer [Line Items]
Revenues	90,298	69,268	174,078	132,151
Application testing services [Member]
Revenue from External Customer [Line Items]
Revenues	26,547	20,428	50,700	39,296
Application maintenance and support [Member]
Revenue from External Customer [Line Items]
Revenues	10,648	8,728	21,487	16,969
Infrastructure services [Member]
Revenue from External Customer [Line Items]
Revenues	3,461	3,148	6,871	5,752
Licensing [Member]
Revenue from External Customer [Line Items]
Revenues	720	522	1,298	1,222
Reimbursable expenses and other revenues [Member]
Revenue from External Customer [Line Items]
Revenues	$ 1,510	$ 1,706	$ 2,948	$ 2,793