Nature of Business and Significant Accounting Policies - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended				12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Jun. 30, 2011	Dec. 31, 2010	Dec. 31, 2012 Customer	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Organization Consolidation And Summary Of Significant Accounting Policies [Line Items]
Collections in respect of prior year write-offs amount					$ 0	$ 0	$ 1,686
Goodwill impairment charges	0	0	1,697	0		1,697
Finite lived intangible assets impairment charges					0	0	0
Long-lived assets impairment charges					0	0	0
Cash and cash equivalents	118,112	88,796		54,004	118,112	88,796	54,004	52,927
Number of customers accounted for more than ten percentage of revenue					0
Subcontractor costs					3,535	4,545	12,219
Variable rate in addition to LIBOR	1.25%				1.25%
Vesting term					4 years
Minimum
Organization Consolidation And Summary Of Significant Accounting Policies [Line Items]
Warranty period					6 months
Estimated useful lives of property and equipment					3 years
Maximum
Organization Consolidation And Summary Of Significant Accounting Policies [Line Items]
Warranty period					2 years
Cash equivalents maturity period					3 months
Estimated useful lives of property and equipment					50 years
Top five Clients
Organization Consolidation And Summary Of Significant Accounting Policies [Line Items]
Percentage of revenues accounted by major customers					31.00%	32.00%	29.70%
Top ten clients
Organization Consolidation And Summary Of Significant Accounting Policies [Line Items]
Percentage of revenues accounted by major customers					44.40%	44.60%	42.60%
Thomson Reuters
Organization Consolidation And Summary Of Significant Accounting Policies [Line Items]
Percentage of revenues accounted by major customers						10.70%	11.70%
Entity-Wide Revenue, Major Customer, Amount						35,900	26,000
Percentage of total account receivable accounted by major customers						15.90%
Thomson Reuters | Unbilled Revenues
Organization Consolidation And Summary Of Significant Accounting Policies [Line Items]
Percentage of revenues accounted by major customers						15.00%
CIS Countries
Organization Consolidation And Summary Of Significant Accounting Policies [Line Items]
Cash and cash equivalents	76,200				76,200
Belarus
Organization Consolidation And Summary Of Significant Accounting Policies [Line Items]
Cash and cash equivalents	$ 50,600				$ 50,600
Time-and-Material Contracts
Organization Consolidation And Summary Of Significant Accounting Policies [Line Items]
Percentage of revenues					84.10%	86.10%	85.20%
Fixed-Price Contracts
Organization Consolidation And Summary Of Significant Accounting Policies [Line Items]
Percentage of revenues					13.70%	11.00%	12.30%
Fixed-Price Contracts | Maximum
Organization Consolidation And Summary Of Significant Accounting Policies [Line Items]
Fixed price contracts period					12 months