Quarterly report pursuant to Section 13 or 15(d)

REVENUES - Schedule of Revenues by Service Line (Details)

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REVENUES - Schedule of Revenues by Service Line (Details) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Disaggregation of Revenue [Line Items]    
Revenue $ 300,602 $ 270,193
Oil and gas services    
Disaggregation of Revenue [Line Items]    
Revenue 189,596 191,937
Oil and gas services | Reclassification Adjustment    
Disaggregation of Revenue [Line Items]    
Revenue   (3,500)
Government services    
Disaggregation of Revenue [Line Items]    
Revenue 70,436 54,611
Government services | Reclassification Adjustment    
Disaggregation of Revenue [Line Items]    
Revenue   2,000
Fixed wing services    
Disaggregation of Revenue [Line Items]    
Revenue 24,654 11,559
Other services    
Disaggregation of Revenue [Line Items]    
Revenue 3,665 3,401
Other services | Reclassification Adjustment    
Disaggregation of Revenue [Line Items]    
Revenue   3,500
Service    
Disaggregation of Revenue [Line Items]    
Revenue $ 288,351 261,508
Oil and Gas and Other Services | Reclassification Adjustment    
Disaggregation of Revenue [Line Items]    
Revenue   $ (2,000)