SEGMENT INFORMATION AND REVENUE ANALYSIS (Details 2) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
item
Dec. 31, 2012
Dec. 31, 2011
SEGMENT INFORMATION AND REVENUE ANALYSIS      
Number of services lines 3    
Net revenues $ 670,019 $ 359,031 $ 218,989
ITS
     
SEGMENT INFORMATION AND REVENUE ANALYSIS      
Net revenues 398,915 212,448 126,105
RDS
     
SEGMENT INFORMATION AND REVENUE ANALYSIS      
Net revenues 259,606 144,173 92,884
BPO
     
SEGMENT INFORMATION AND REVENUE ANALYSIS      
Net revenues $ 11,498 $ 2,410