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Information about Geographic Areas - Revenues by Geographic Area, Based on Billing Location of Customer (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Segment Reporting Information [Line Items]        
Percentage of U.S. Revenues in North America 94.00% 94.00% 94.00% 94.00%
Revenues by geography        
Revenues $ 178,712 $ 111,259 $ 484,559 $ 299,420
North America [Member]
       
Revenues by geography        
Revenues 120,435 [1] 76,851 [1] 329,660 [1] 208,851 [1]
EuropeMiddleEastAfrica [Member] [Domain]
       
Revenues by geography        
Revenues 46,521 [2] 27,621 [2] 125,021 [2] 72,403 [2]
Asia Pacific and other [Member]
       
Revenues by geography        
Revenues $ 11,756 $ 6,787 $ 29,878 $ 18,166
[1] Revenues attributed to the United States were approximately 94% of North America revenues for the three months ended September 30, 2014 and 2013 and the nine months ended September 30, 2014 and 2013.
[2] Europe, the Middle East and Africa