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SHARE-BASED COMPENSATION (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
SHARE-BASED COMPENSATION      
Pre-tax share-based compensation expense $ 13,098us-gaap_AllocatedShareBasedCompensationExpense $ 10,008us-gaap_AllocatedShareBasedCompensationExpense $ 6,719us-gaap_AllocatedShareBasedCompensationExpense
Income tax benefit (5,508)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense (4,135)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense (2,908)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
Total share-based compensation expense, net of tax 7,590us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax 5,873us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax 3,811us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
Direct cost of services      
SHARE-BASED COMPENSATION      
Pre-tax share-based compensation expense 2,359us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember		 660us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember		 201us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
Selling, general and administrative expense      
SHARE-BASED COMPENSATION      
Pre-tax share-based compensation expense $ 10,739us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember		 $ 9,348us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember		 $ 6,518us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember