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Business Combinations - Schedule of Valuation of Net Assets Acquired (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Jul. 13, 2017
Identifiable intangible assets:      
Goodwill $ 26,106 $ 26,106  
Info Trellis Inc [Member]      
Business Acquisition [Line Items]      
Current Assets     $ 6,909
Fixed Assets and Other     215
Identifiable intangible assets:      
Identifiable intangible assets     19,862
Goodwill     27,417
Current liabilities     (2,389)
Net Assets Acquired     52,014
Info Trellis Inc [Member] | Client Relationships [Member]      
Identifiable intangible assets:      
Identifiable intangible assets     16,671
Info Trellis Inc [Member] | Covenant Not-to-Compete [Member]      
Identifiable intangible assets:      
Identifiable intangible assets     761
Info Trellis Inc [Member] | Trade Name [Member]      
Identifiable intangible assets:      
Identifiable intangible assets     1,221
Info Trellis Inc [Member] | Technology [Member]      
Identifiable intangible assets:      
Identifiable intangible assets     $ 1,209