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Contract Revenue and Pass-through and Other Revenue - Schedule of Future Minimum Rental Income under Non-cancelable Operating Leases (Detail)
$ in Thousands
Sep. 30, 2021
USD ($)
Lessor Operating Lease Payments Rolling Maturity [Abstract]  
2022 $ 15,288
2023 15,288
2024 15,288
2025 15,288
2026 15,288
Thereafter 54,467
Total $ 130,907