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Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Supplemental Cash Flow Elements [Abstract]
Accounts receivable	$ (8,552)	$ (10,089)	$ (7,203)
Contracts in progress, net	65,963	(5,188)	(8,288)
Receivables from and equity in construction joint ventures	(7,457)	1,524	659
Other current and non-current assets	(7,861)	43	924
Accounts payable	(42,392)	10,987	1,969
Accrued compensation and other liabilities	8,260	(839)	(4,038)
Members' interest subject to mandatory redemption and undistributed earnings	2,287	(340)	1,957
Changes in operating assets and liabilities	$ (10,248)	$ 3,902	$ 14,020

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
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-Section 45
-Paragraph 28
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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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- 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

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-Publisher FASB
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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

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

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Amount of increase (decrease) in operating assets classified as other.

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