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ACQUISITIONS - Narrative (Detail) - USD ($)
12 Months Ended
Oct. 30, 2019
Feb. 28, 2019
Feb. 01, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition            
Payment for contingent consideration       $ 5,619,000 $ 0 $ 0
Contingent consideration       0    
Courthouse Technologies, Ltd            
Business Acquisition            
Cash to acquire business $ 20,400,000          
Adjustments related to intangibles       1,700,000    
Adjustments related to goodwill       (1,689,000)    
MicroPact            
Business Acquisition            
Cash to acquire business   $ 198,200,000        
Total purchase price to acquire business   201,800,000        
Net cash acquired   $ 2,000,000.0        
Payment for contingent consideration       $ 5,600,000    
MyCivic            
Business Acquisition            
Cash to acquire business     $ 3,700,000      
MicroPact And MyCivic            
Business Acquisition            
Acquisition related fees         $ 1,100,000