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Goodwill and Intangible Assets, Net (Details 3) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Changes in the carrying amount of goodwill    
Balance at the beginning of the period $ 99,849  
Acquisitions 29,674  
Foreign exchange 1,033  
Balance at the end of the period 130,556 71,338
Changes in the carrying amount of intangible assets    
Balance at the beginning of the period 27,856  
Acquisitions 16,638  
Amortization (1,851) (1,100)
Foreign exchange 841  
Balance at the end of the period $ 43,484 $ 22,896