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COMMITMENTS AND CONTINGENCIES (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Apr. 29, 2016
aircraft
People
Dec. 31, 2016
USD ($)
aircraft
Facility
Sep. 30, 2016
aircraft
Jun. 30, 2016
aircraft
Dec. 31, 2015
USD ($)
aircraft
Dec. 31, 2016
USD ($)
aircraft
Facility
Dec. 31, 2015
USD ($)
aircraft
Commitments And Contingencies [Abstract]              
Number of fatalities | People 13            
Number of signed client contracts   6       6  
Aircraft delivered   (1)     (8) (7) (11)
Rent expense | $   $ 53,700     $ 52,200 $ 156,900 $ 160,500
Operating leases, term of contract           180 months  
Operating leases, renewal term           240 months  
Number of leased aircraft   93       93  
Site contingency, number of locations | Facility   3       3  
Minimum              
Commitments And Contingencies [Abstract]              
Loss Contingency, Estimate of Possible Loss | $   $ 5,000       $ 5,000  
Maximum              
Commitments And Contingencies [Abstract]              
Loss Contingency, Estimate of Possible Loss | $   7,000       7,000  
Passenger              
Commitments And Contingencies [Abstract]              
Number of fatalities | People 11            
Crew              
Commitments And Contingencies [Abstract]              
Number of fatalities | People 2            
Voluntary Separation Program              
Commitments And Contingencies [Abstract]              
Severance costs | $   179     895 1,647 8,169
Voluntary Separation Program | Direct cost              
Commitments And Contingencies [Abstract]              
Severance costs | $   179     661 1,624 7,338
Voluntary Separation Program | General administrative expense              
Commitments And Contingencies [Abstract]              
Severance costs | $   0     234 23 831
Involuntary Separation Program              
Commitments And Contingencies [Abstract]              
Severance costs | $   566     6,453 14,057 12,870
Involuntary Separation Program | Direct cost              
Commitments And Contingencies [Abstract]              
Severance costs | $   464     2,184 5,360 4,745
Involuntary Separation Program | General administrative expense              
Commitments And Contingencies [Abstract]              
Severance costs | $   $ 102     $ 4,269 $ 8,697 $ 8,125
Unionized employees concentration risk | Workforce subject to collective bargaining arrangements              
Commitments And Contingencies [Abstract]              
Concentration risk, percentage           52.00%  
Collective bargaining agreements, maximum annual escalation per employee, percent           4.00%  
Unionized employees concentration risk | Workforce subject to collective bargaining arrangements expiring within one year              
Commitments And Contingencies [Abstract]              
Concentration risk, percentage           83.00%  
Three months ending March 31, 2017 to fiscal year 2018              
Commitments And Contingencies [Abstract]              
Number of leased aircraft   19       19  
Fiscal year 2019 to fiscal year 2021              
Commitments And Contingencies [Abstract]              
Number of leased aircraft   57       57  
Fiscal year 2022 to fiscal year 2025              
Commitments And Contingencies [Abstract]              
Number of leased aircraft   17       17  
Medium aircraft              
Commitments And Contingencies [Abstract]              
Aircraft delivered   0     0 (5) (1)
Large aircraft              
Commitments And Contingencies [Abstract]              
Aircraft delivered   0     (2) 0 (2)
U.K. SAR              
Commitments And Contingencies [Abstract]              
Aircraft delivered   (1)     (6) (2) (8)
H225 Super Puma              
Commitments And Contingencies [Abstract]              
Number of aircraft operated 27            
Number of aircraft owned 16            
Number of leased aircraft 11            
H225 Super Puma | Norway              
Commitments And Contingencies [Abstract]              
Number of aircraft operated 5            
H225 Super Puma | Norway | Commercial purpose aircraft              
Commitments And Contingencies [Abstract]              
Number of aircraft suspended   1          
H225 Super Puma | Norway | Search And Rescue purpose aircraft              
Commitments And Contingencies [Abstract]              
Number of aircraft suspended   4          
H225 Super Puma | United Kingdom              
Commitments And Contingencies [Abstract]              
Number of aircraft operated 13            
H225 Super Puma | United Kingdom | Commercial purpose aircraft              
Commitments And Contingencies [Abstract]              
Number of aircraft suspended   13          
H225 Super Puma | Australia              
Commitments And Contingencies [Abstract]              
Number of aircraft operated 9            
H225 Super Puma | Australia | Commercial purpose aircraft              
Commitments And Contingencies [Abstract]              
Number of aircraft suspended   6          
H225 Super Puma | Australia | Search And Rescue purpose aircraft              
Commitments And Contingencies [Abstract]              
Number of aircraft suspended   3          
Aircraft              
Commitments And Contingencies [Abstract]              
Rent expense | $   $ 47,900     $ 45,600 $ 138,700 $ 139,500
Other commitments              
Commitments And Contingencies [Abstract]              
Purchase commitments | $   $ 55,500       $ 55,500  
Commitments              
Commitments And Contingencies [Abstract]              
Beginning of quarter   35 36 36   36  
Aircraft delivered   (1) (6) 0      
Aircraft ordered   0 5 0      
Expired options   0 0 0      
End of quarter   34 35 36   34  
Options              
Commitments And Contingencies [Abstract]              
Beginning of quarter   6 10 14   14  
Aircraft delivered   0 0 0      
Aircraft ordered   0 0 0      
Expired options   (2) (4) (4)      
End of quarter   4 6 10   4  
Aircraft              
Commitments And Contingencies [Abstract]              
Number of aircraft purchase commitments, due remainder of fiscal year   2       2  
Number of aircraft purchase commitments, due in two years   9       9  
Number of aircraft purchase commitments, due in three years   5       5  
Number of aircraft purchase commitments, due in four years   4       4  
Number of aircraft purchase commitments, due in five years and after   14       14  
Number of aircraft purchase commitments   34       34  
Purchase commitments, due remainder of year | $   $ 4,633       $ 4,633  
Purchase commitments, Due within Two Years | $   60,471       60,471  
Purchase commitments, Due within Three Years | $   92,735       92,735  
Purchase commitments, Due within Four Years | $   72,133       72,133  
Purchase commitments, Due within Five Years And After | $   194,624       194,624  
Purchase commitments | $   $ 424,596       $ 424,596  
Number of aircraft purchase options   4       4  
Aircraft purchase options, due remainder of year | $   $ 0       $ 0  
Aircraft purchase options, due in two years | $   43,088       43,088  
Aircraft purchase options, due in three years | $   30,410       30,410  
Aircraft purchase options, due in four years | $   0       0  
Aircraft purchase options, due in five years and after | $   0       0  
Aircraft purchase options | $   $ 73,498       $ 73,498  
Aircraft | Medium aircraft              
Commitments And Contingencies [Abstract]              
Number of aircraft purchase commitments, due remainder of fiscal year   0       0  
Number of aircraft purchase commitments, due in two years   5       5  
Number of aircraft purchase commitments, due in three years   0       0  
Number of aircraft purchase commitments, due in four years   0       0  
Number of aircraft purchase commitments, due in five years and after   0       0  
Number of aircraft purchase commitments   5       5  
Aircraft | Large aircraft              
Commitments And Contingencies [Abstract]              
Number of aircraft purchase commitments, due remainder of fiscal year   0       0  
Number of aircraft purchase commitments, due in two years   0       0  
Number of aircraft purchase commitments, due in three years   5       5  
Number of aircraft purchase commitments, due in four years   4       4  
Number of aircraft purchase commitments, due in five years and after   14       14  
Number of aircraft purchase commitments   23       23  
Number of aircraft purchase options, due remainder of fiscal year   0       0  
Number of aircraft purchase options, due in two years   2       2  
Number of aircraft purchase options, due in three years   2       2  
Number of aircraft purchase options, due in four years   0       0  
Number of aircraft purchase options, due in five years and after   0       0  
Number of aircraft purchase options   4       4  
Aircraft | Medium and large aircrafts              
Commitments And Contingencies [Abstract]              
Purchase commitments, due remainder of year | $   $ 0       $ 0  
Purchase commitments, Due within Two Years | $   2,263       2,263  
Purchase commitments, Due within Three Years | $   92,735       92,735  
Purchase commitments, Due within Four Years | $   72,133       72,133  
Purchase commitments, Due within Five Years And After | $   194,624       194,624  
Purchase commitments | $   $ 361,755       $ 361,755  
Aircraft | U.K. SAR              
Commitments And Contingencies [Abstract]              
Number of aircraft purchase commitments, due remainder of fiscal year   2       2  
Number of aircraft purchase commitments, due in two years   4       4  
Number of aircraft purchase commitments, due in three years   0       0  
Number of aircraft purchase commitments, due in four years   0       0  
Number of aircraft purchase commitments, due in five years and after   0       0  
Number of aircraft purchase commitments   6       6  
Purchase commitments, due remainder of year | $   $ 4,633       $ 4,633  
Purchase commitments, Due within Two Years | $   58,208       58,208  
Purchase commitments, Due within Three Years | $   0       0  
Purchase commitments, Due within Four Years | $   0       0  
Purchase commitments, Due within Five Years And After | $   0       0  
Purchase commitments | $   $ 62,841       $ 62,841  
Cancellable commitments              
Commitments And Contingencies [Abstract]              
Number of aircraft purchase commitments   5       5  
Purchase commitments | $   $ 83,700       $ 83,700  
Deposit | $   $ 4,500       $ 4,500