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Nature of Business and Summary of Significant Accounting Policies - Components of Other Current Assets and Other Current Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Other Current Assets and Liabilities [Line Items]    
Other $ 7,574 $ 5,781
Total other current assets 39,830 58,126
Settlement payables 31,605 48,953
Accrued interest 8,407 7,291
Vendor financed licenses 3,551 1,862
Royalties payable 11,318 9,264
Other 33,173 35,534
Total other current liabilities 88,054 102,904
Settlement deposits [Member]    
Other Current Assets and Liabilities [Line Items]    
Other assets settlement 23,651 22,282
Settlement receivables [Member]    
Other Current Assets and Liabilities [Line Items]    
Other assets settlement $ 8,605 $ 30,063