SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 4) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Revenue recognition      
Net revenues $ 670,019 $ 359,031 $ 218,989
Time-and-material
     
Revenue recognition      
Net revenues 543,062 282,615 175,115
Fixed-price
     
Revenue recognition      
Net revenues $ 126,957 $ 76,416 $ 43,874