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Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Supplemental Cash Flow Elements [Abstract]
Accounts receivable, including retainage	$ (23,095)	$ (15,486)
Contracts in progress, net	29,220	(26,934)
Receivables from and equity in construction joint ventures	(4,606)	(3,931)
Other current and non-current assets	(5,579)	(2,111)
Accounts payable	(10,257)	11,198
Accrued compensation and other liabilities	21,350	7,330
Members' interest subject to mandatory redemption and undistributed earnings	1,795	1,929
Changes in operating assets and liabilities	$ 8,828	$ (28,005)

X

- Definition

Represents the increase (decrease) in member's interest subject to mandatory redemption and undistributed earnings.

+ References

No definition available.

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- Definition

The net change during the reporting period in Equity in and Receivable from unconsolidated joint ventures.

+ References

No definition available.

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- Definition

The increase (decrease) during the reporting period in the aggregate amount of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

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- Definition

The increase (decrease) during the reporting period in the aggregate amount of expenses incurred but not yet paid.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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- Definition

Amount of increase (decrease) in right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
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- Definition

Amount of increase (decrease) in obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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-Section 45
-Paragraph 28
-Subparagraph (a)
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- Definition

The increase (decrease) during the reporting period of all assets and liabilities used in operating activities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount of increase (decrease) in operating assets classified as other.

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-Section 45
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