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BASIS OF PRESENTATION, CONSOLIDATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property and Equipment Disposed of and Impairments (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Dec. 31, 2017
USD ($)
aircraft
Sep. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
aircraft
Dec. 31, 2017
USD ($)
aircraft
Dec. 31, 2016
USD ($)
aircraft
Property, Plant and Equipment [Line Items]          
Number of aircraft sold or disposed of | aircraft 5   3 11 9
Proceeds from asset dispositions $ 6,303   $ 2,525 $ 48,547 $ 14,344
Loss on disposal of assets $ 4,591   $ 874 $ 12,418 $ 13,077
Number of aircraft impaired | aircraft 1   1 5 13
Impairment charges on aircraft held for sale $ 1,560   $ 200 $ 11,307 $ 11,360
Air transportation equipment          
Property, Plant and Equipment [Line Items]          
Loss on disposal of assets $ 3,031   $ 674 1,111 $ 1,717
Bristow Academy | Held-for-sale          
Property, Plant and Equipment [Line Items]          
Impairment charges on aircraft held for sale   $ 6,500   $ 6,500