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Contract Revenue and Pass-through and Other Revenue - Schedule of Deferred Revenue Remaining Performance Obligations (Detail)
$ in Thousands
Sep. 30, 2022
USD ($)
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]  
Total Revenue $ 24,067
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2022-10-01  
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]  
Total Revenue $ 385
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2023-10-01  
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]  
Total Revenue $ 2,553
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2024-10-01  
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]  
Total Revenue $ 10,065
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2025-10-01  
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]  
Total Revenue $ 4,792
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2026-10-01  
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]  
Total Revenue $ 3,679
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2027-10-01  
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]  
Total Revenue $ 2,593
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 1 year