Accounts Receivable - Summary of Accounts Receivable (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contract receivables	$ 54,614	$ 58,881
Allowance for doubtful accounts	(3,003)	(2,582)
Total accounts receivable	60,814	68,434
Trade Accounts Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade receivables	$ 9,203	$ 12,135