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Construction Contract and Other Service Revenues - Narrative (Details) - Construction Contract Revenue - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Remaining performance obligations	$ 176,600,000
Remaining performance obligation expected to be recognized during the remainder of year	74,000,000
Deferred incremental costs incurred	$ 0	$ 0

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- Definition

Deferred Incremental Costs Incurred

+ References

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- Definition

Revenue, Remaining Performance Obligation, Amount to be Recognized During the Remainder of the Year

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130556-203045

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