v3.5.0.2
Segment Information - Schedule of Financial Information Concerning Reportable Operating Segments (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Segment Reporting Information [Line Items]        
Total operating revenues, net $ 158,093 $ 214,733 $ 489,245 $ 617,477
Total direct expenses 144,938 182,064 449,909 520,099
Total segment selling, general and administrative expenses 13,381 11,575 36,832 34,859
Total (509) 21,184 6,084 62,508
Interest expense (7,719) (7,366) (22,792) (21,691)
(Loss) earnings before income taxes (7,766) 14,290 (15,137) 42,318
Reportable Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Total operating revenues, net 158,093 214,733 489,245 617,477
Total direct expenses [1] 145,136 182,139 450,183 520,348
Total segment selling, general and administrative expenses 5,027 3,929 13,894 11,841
Total segment expenses 150,163 186,068 464,077 532,189
Total 7,930 28,665 25,168 85,288
Reportable Operating Segments [Member] | Air Medical [Member]        
Segment Reporting Information [Line Items]        
Total operating revenues, net 74,482 85,516 220,089 239,543
Total direct expenses [1] 56,562 65,474 172,603 189,089
Total segment selling, general and administrative expenses 3,056 2,302 8,293 7,458
Total 14,864 17,740 39,193 42,996
Reportable Operating Segments [Member] | Oil and Gas [Member]        
Segment Reporting Information [Line Items]        
Total operating revenues, net 77,551 121,190 249,173 354,425
Total direct expenses [1],[2] 82,832 109,500 262,148 310,093
Total segment selling, general and administrative expenses 1,705 1,397 4,838 3,831
Total (6,986) 10,293 (17,813) 40,501
Reportable Operating Segments [Member] | Technical Services [Member]        
Segment Reporting Information [Line Items]        
Total operating revenues, net 6,060 8,027 19,983 23,509
Total direct expenses [1] 5,742 7,165 15,432 21,166
Total segment selling, general and administrative expenses 266 230 763 552
Total 52 632 3,788 1,791
Segment Reconciling Items [Member]        
Segment Reporting Information [Line Items]        
Other, net [3] 377 637 5,425 1,739
Interest expense (7,719) (7,366) (22,792) (21,691)
Unallocated Selling, General and Administrative Expenses [Member]        
Segment Reporting Information [Line Items]        
Unallocated selling, general and administrative costs [1] $ (8,354) $ (7,646) $ (22,938) $ (23,018)
[1] Included in direct expenses and unallocated selling, general, and administrative costs are the depreciation and amortization expense amounts below: Depreciation and Amortization Expense Quarter Ended Nine Months Ended September 30, September 30, 2016 2015 2016 2015 Segment Direct Expense: Oil and Gas $ 10,616 $ 11,194 $ 30,558 $ 32,797 Air Medical 5,267 4,100 14,654 12,948 Technical Services 141 130 426 390 Total $ 16,024 $ 15,424 $ 45,638 $ 46,135 Unallocated SG&A $ 2,269 $ 2,376 $ 7,416 $ 8,177
[2] Includes Equity in loss of unconsolidated affiliate.
[3] Consists of gains on disposition of property and equipment, and other income.