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Acquisitions - Allocation of Purchase Price for Acquired Net Assets Based on their Estimated Fair Values (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
May. 08, 2015
Dec. 31, 2014
Business Acquisition [Line Items]      
Goodwill $ 33,461   $ 20,802
Sign Up 4 [Member]      
Business Acquisition [Line Items]      
Tangible liabilities assumed, net   $ (1,420)  
Goodwill   12,558  
Total consideration   19,212  
Sign Up 4 [Member] | Trademarks/Trade Names [Member]      
Business Acquisition [Line Items]      
Intangible assets   164  
Sign Up 4 [Member] | Developed Technology Rights [Member]      
Business Acquisition [Line Items]      
Intangible assets   870  
Sign Up 4 [Member] | Customer Relationships [Member]      
Business Acquisition [Line Items]      
Intangible assets   $ 7,040