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Business Combinations - Summary of Fair Value of Consideration for Acquired Business (Detail) - USD ($)
$ in Thousands
Jul. 13, 2017
Dec. 31, 2017
Business Acquisition [Line Items]    
Estimated payout of contingent consideration   $ 17,125
Info Trellis Inc [Member]    
Business Acquisition [Line Items]    
Cash purchase price at closing $ 35,750  
Working capital adjustments (861)  
Estimated payout of contingent consideration 17,125  
Total Fair Value of Consideration $ 52,014