Prepaid Expenses and Other Assets - Summary of Prepaid Expenses and Other Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Prepaid Expense and Other Assets [Abstract]
Revenues in excess of billings	$ 7,999	$ 8,282
Prepaid expenses	8,762	6,664
Contract retainage	2,097	1,832
Income tax receivable	53	2,675
Other	605	350
Total prepaid expenses and other assets	$ 19,516	$ 19,803