Revenue from Contracts with Customers - Narrative (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($) project	Sep. 30, 2020 USD ($) project	Sep. 30, 2021 USD ($) project	Sep. 30, 2020 USD ($) project	Dec. 31, 2020 USD ($)
Property, Plant and Equipment [Line Items]
Duration period of contracts with customers			six months to two years
Percentage completed of certain milestones			10.00%
Net realizable value of unapproved orders	$ 39,200		$ 39,200		$ 33,600
Gross profit write downs	1,200	$ 800	1,300	$ 4,200
Revision amount for gross profit impact on contract estimates (more than)	250		250
GCR
Property, Plant and Equipment [Line Items]
Gross profit write downs	$ 1,400	$ 2,400	$ 5,300	$ 7,500
Number of projects subject to gross profit write downs | project	3	5	9	11
Number of projects subject to gross profit write ups | project	3			3
Gross profit write ups	$ 1,200		$ 2,900	$ 1,600
GCR | New England Region Project
Property, Plant and Equipment [Line Items]
Gross profit write downs	$ 600		$ 700
Number of projects subject to gross profit write downs | project	1		1
Number of projects subject to gross profit write ups | project	1		1
Gross profit write ups	$ 600		$ 400
GCR | Southern California Region Project
Property, Plant and Equipment [Line Items]
Gross profit write downs	$ 800	$ 1,800	$ 1,800
Number of projects subject to gross profit write downs | project	2	3	3
Number of projects subject to gross profit write ups | project		1	7
Gross profit write ups		$ 400
GCR | Florida Region Project
Property, Plant and Equipment [Line Items]
Number of projects subject to gross profit write ups | project	2		2
Gross profit write ups	$ 600		$ 900
GCR | Michigan Region Project
Property, Plant and Equipment [Line Items]
Gross profit write downs			$ 1,300
Number of projects subject to gross profit write downs | project			2
Number of projects subject to gross profit write ups | project			1
Gross profit write ups			$ 700
GCR | Eastern Pennsylvania Region Project
Property, Plant and Equipment [Line Items]
Gross profit write downs			$ 1,200
Number of projects subject to gross profit write downs | project			2
GCR | Mid-Atlantic Region Project
Property, Plant and Equipment [Line Items]
Gross profit write downs			$ 300
Number of projects subject to gross profit write downs | project			1
Number of projects subject to gross profit write ups | project			1
Gross profit write ups			$ 300
GCR | Ohio Region Project
Property, Plant and Equipment [Line Items]
Number of projects subject to gross profit write ups | project			2
Gross profit write ups			$ 600
ODR
Property, Plant and Equipment [Line Items]
Gross profit write downs			$ 300
Number of projects subject to gross profit write downs | project			1
ODR | Eastern Pennsylvania Region Project
Property, Plant and Equipment [Line Items]
Gross profit write downs			$ 300
Number of projects subject to gross profit write downs | project			1