OPERATING SEGMENTS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended									12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Jun. 30, 2011	Dec. 31, 2013 Customer	Dec. 31, 2012 Customer	Dec. 31, 2011 Customer
Segment Reporting Information [Line Items]
Revenues	$ 157,585	$ 140,150	$ 133,184	$ 124,198	$ 125,538	$ 110,078	$ 103,800	$ 94,383		$ 555,117	$ 433,799	$ 334,528
Operating profit	23,192	20,230	17,535	15,536	18,656	16,736	16,830	13,784		76,493	66,006	55,008
Unallocated Amounts:
Stock-based compensation expense										(13,150)	(6,826)	(2,866)
Depreciation and amortization	(3,743)	(3,906)	(3,854)	(3,617)	(3,208)	(3,040)	(2,423)	(2,211)		(15,120)	(10,882)	(7,538)
Goodwill impairment loss (Note 3)									(1,697)	0	0	(1,697)
Provision for bad debts										(335)	(662)	(727)
Income from operations	23,192	20,230	17,535	15,536	18,656	16,736	16,830	13,784		76,493	66,006	55,008
Interest and other income, net										3,077	1,941	1,422
Foreign exchange loss	(712)	(720)	(869)	(499)	(135)	(635)	(1,394)	80		(2,800)	(2,084)	(3,638)
Income before provision for income taxes	23,312	20,356	17,435	15,667	19,040	16,587	15,896	14,340		76,770	65,863	52,792
Geographic Areas, Long-Lived Assets [Abstract]
Long-lived assets	53,315				53,135					53,315	53,135
Number Of Customers Accounted For More Than Ten Percentage Of Revenue										0	0	1
Thomson Reuters [Member]
Geographic Areas, Long-Lived Assets [Abstract]
Entity-wide revenue, major customer, amount												35,903
Percentage of revenues accounted by major customer (in hundredths)												10.70%
Reimbursable Expenses and Other Revenues [Member]
Segment Reporting Information [Line Items]
Revenues										7,626	6,417	6,176
Software Development [Member]
Segment Reporting Information [Line Items]
Revenues										374,426	290,139	219,211
Application Testing Services [Member]
Segment Reporting Information [Line Items]
Revenues										109,222	85,849	67,840
Application Maintenance and Support [Member]
Segment Reporting Information [Line Items]
Revenues										45,971	36,056	29,287
Infrastructure Services [Member]
Segment Reporting Information [Line Items]
Revenues										14,433	12,424	8,488
Licensing [Member]
Segment Reporting Information [Line Items]
Revenues										3,439	2,914	3,526
Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues										555,043	433,722	334,287
Operating profit										109,308	87,455	71,703
Unallocated Amounts:
Income from operations										109,308	87,455	71,703
Unallocated Amounts [Member]
Segment Reporting Information [Line Items]
Revenues										74	77	241
Unallocated Amounts:
Other revenue										74	77	241
Stock-based compensation expense										(13,150)	(6,826)	(2,866)
Stock charge										0	(640)	0
Non-corporate taxes										(3,201)	(2,346)	(2,722)
Professional fees										(3,651)	(2,850)	(2,802)
Depreciation and amortization										(2,829)	(1,100)	(810)
Bank charges										(1,194)	(1,136)	(793)
Goodwill impairment loss (Note 3)										0	0	(1,697)
Provision for bad debts										(36)	0	0
Other corporate expenses										(8,828)	(6,628)	(5,246)
North America [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues										284,636	197,271	151,707
Operating profit										66,814	38,671	33,744
Unallocated Amounts:
Income from operations										66,814	38,671	33,744
Europe [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues										204,150	168,913	123,510
Operating profit										34,573	32,750	25,098
Unallocated Amounts:
Income from operations										34,573	32,750	25,098
Russia [Member]
Segment Reporting Information [Line Items]
Revenues										53,328	47,507	43,799
Geographic Areas, Long-Lived Assets [Abstract]
Long-lived assets	3,414				3,234					3,414	3,234
Russia [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues										55,764	50,552	46,219
Operating profit										7,077	9,049	10,445
Unallocated Amounts:
Income from operations										7,077	9,049	10,445
Belarus [Member]
Geographic Areas, Long-Lived Assets [Abstract]
Long-lived assets	38,697				40,095					38,697	40,095
United States [Member]
Segment Reporting Information [Line Items]
Revenues										247,979	197,593	163,068
Geographic Areas, Long-Lived Assets [Abstract]
Long-lived assets	2,217				2,048					2,217	2,048
Hungary [Member]
Geographic Areas, Long-Lived Assets [Abstract]
Long-lived assets	2,644				1,744					2,644	1,744
United Kingdom [Member]
Segment Reporting Information [Line Items]
Revenues										108,892	98,346	70,989
Switzerland [Member]
Segment Reporting Information [Line Items]
Revenues										51,941	30,120	15,870
Germany [Member]
Segment Reporting Information [Line Items]
Revenues										20,261	16,391	7,909
Kazakhstan [Member]
Segment Reporting Information [Line Items]
Revenues										9,886	11,352	8,845
Canada [Member]
Segment Reporting Information [Line Items]
Revenues										33,759	9,256	2,058
Sweden [Member]
Segment Reporting Information [Line Items]
Revenues										5,742	4,913	5,292
Ukraine [Member]
Segment Reporting Information [Line Items]
Revenues										681	4,733	891
Geographic Areas, Long-Lived Assets [Abstract]
Long-lived assets	5,525				5,357					5,525	5,357
Netherlands [Member]
Segment Reporting Information [Line Items]
Revenues										7,719	3,127	4,031
Other Countries [Member]
Segment Reporting Information [Line Items]
Revenues										5,346	2,334	3,707
Geographic Areas, Long-Lived Assets [Abstract]
Long-lived assets	818				657					818	657
Other Countries [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues										10,493	16,986	12,851
Operating profit										844	6,985	2,416
Unallocated Amounts:
Income from operations										844	6,985	2,416
Spain [Member]
Segment Reporting Information [Line Items]
Revenues										$ 1,957	$ 1,710	$ 1,893