Prepaid Expenses and Other Assets - Summary of Prepaid Expenses and Other Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Prepaid Expense and Other Assets [Abstract]
Prepaid expenses	$ 7,640	$ 7,285
Revenues in excess of billings	6,499	6,612
Contract retainage	2,896	2,267
Income tax receivable		7,823
Other	287	1,323
Total prepaid expenses and other assets	$ 17,322	$ 25,310