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Business Combinations, Goodwill and Intangible Assets - Summary of Purchase Price Allocation for Acquisitions (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Mar. 20, 2015
Dec. 31, 2014
Dec. 31, 2013
Business Acquisition [Line Items]        
Goodwill $ 171,535   $ 139,599 $ 107,407
RPM Direct LLC and RPM Data Solutions LLC        
Business Acquisition [Line Items]        
Net tangible assets 1,790      
Goodwill 33,155      
Total purchase price 50,985      
Escrow deposit   $ 4,125    
RPM Direct LLC and RPM Data Solutions LLC | Customer relationships        
Business Acquisition [Line Items]        
Identifiable intangible assets 13,260      
RPM Direct LLC and RPM Data Solutions LLC | Trade Names        
Business Acquisition [Line Items]        
Identifiable intangible assets 680      
RPM Direct LLC and RPM Data Solutions LLC | Developed technology        
Business Acquisition [Line Items]        
Identifiable intangible assets 1,420      
RPM Direct LLC and RPM Data Solutions LLC | Non-compete agreements        
Business Acquisition [Line Items]        
Identifiable intangible assets $ 680