Segment and Related Information - Depreciation and Amortization Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Depreciation and Amortization Expense
Depreciation and amortization expense	$ 599	$ 567	$ 1,784	$ 1,856
Operating segment | Project Management
Depreciation and Amortization Expense
Depreciation and amortization expense	349	6	1,049	769
Corporate
Depreciation and Amortization Expense
Depreciation and amortization expense	$ 250	$ 561	$ 735	$ 1,087