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Accounts Receivable - Summary of Accounts Receivable (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Contract receivables $ 50,458 $ 48,826
Allowance for doubtful accounts (2,796) (2,897)
Total accounts receivable 60,037 53,225
Trade Accounts Receivable [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Trade receivables $ 12,375 $ 7,296