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Accounts Receivable - Summary of Accounts Receivable (Detail) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Contract receivables $ 57,560 $ 57,435
Allowance for doubtful accounts (3,010) (3,110)
Total accounts receivable 65,650 63,046
Trade Accounts Receivable [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Trade receivables $ 11,100 $ 8,721