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Trade Receivables of Major Clients (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Sep. 30, 2013
Client A
Sep. 30, 2013
Client A
Dec. 31, 2012
Client A
Revenue, Major Customer [Line Items]                
Total revenue $ 122,011 $ 101,657 $ 355,572 $ 317,880        
Major clients percentage of total revenue           10.00%    
Trade receivables, net of allowance $ 90,583   $ 90,583   $ 134,066      
Major clients percentage of trade receivables             13.00% 10.00%