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Contract Revenue and Pass-through and Other Revenue - Schedule of Deferred Revenue Remaining Performance Obligations (Detail 1) $ in Thousands	Sep. 30, 2021 USD ($)
Revenue Performance Obligation Satisfied Over Time [Abstract]
Total Revenue	$ 34,500

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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X

- 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=123351226&loc=SL49130556-203045

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