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Accounts Receivable - Summary of Accounts Receivable (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contract receivables	$ 49,925	$ 48,826
Allowance for doubtful accounts	(2,711)	(2,897)
Total accounts receivable	58,091	53,225
Trade Accounts Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade receivables	$ 10,877	$ 7,296

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