Accounts Receivable - Summary of Accounts Receivable (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contract receivables	$ 47,128	$ 58,881
Allowance for doubtful accounts	(2,563)	(2,582)
Total accounts receivable	55,638	68,434
Trade Accounts Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade receivables	$ 11,073	$ 12,135