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Long-lived Assets by Geographic Area (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Jun. 30, 2011
Jun. 30, 2010
Segment Reporting Information [Line Items]        
Long-lived assets $ 39,086 $ 20,695 $ 9,467 $ 1,698
North America
       
Segment Reporting Information [Line Items]        
Long-lived assets 28,561 15,820 7,859 1,013
Europe
       
Segment Reporting Information [Line Items]        
Long-lived assets 9,320 4,537 1,391 500
Asia Pacific and other
       
Segment Reporting Information [Line Items]        
Long-lived assets $ 1,205 $ 338 $ 217 $ 185