SEGMENT INFORMATION - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended			3 Months Ended		6 Months Ended				3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended			3 Months Ended		6 Months Ended
	Jun. 30, 2013 Contract Entity	Dec. 31, 2012	Jun. 30, 2012	Jun. 30, 2013 Reportable operating segments [Member] Oil And Gas [Member]	Jun. 30, 2012 Reportable operating segments [Member] Oil And Gas [Member]	Jun. 30, 2013 Reportable operating segments [Member] Oil And Gas [Member] Aircraft	Jun. 30, 2012 Reportable operating segments [Member] Oil And Gas [Member]	Jun. 30, 2013 Reportable operating segments [Member] Oil And Gas [Member] Minimum [Member] Major Customer [Member]	Jun. 30, 2013 Reportable operating segments [Member] Oil And Gas [Member] Minimum [Member] ENI Petroleum [Member]	Jun. 30, 2013 Reportable operating segments [Member] Technical Services [Member]	Jun. 30, 2012 Reportable operating segments [Member] Technical Services [Member]	Jun. 30, 2013 Reportable operating segments [Member] Technical Services [Member]	Jun. 30, 2012 Reportable operating segments [Member] Technical Services [Member]	Jun. 30, 2013 Reportable operating segments [Member] Air Medical [Member]	Jun. 30, 2012 Reportable operating segments [Member] Air Medical [Member]	Jun. 30, 2013 Reportable operating segments [Member] Air Medical [Member] Aircraft Location States	Jun. 30, 2012 Reportable operating segments [Member] Air Medical [Member]	Jun. 30, 2013 Reportable operating segments [Member] Air Medical [Member] Middle East [Member] Location Aircraft	Jun. 30, 2013 Reportable operating segments [Member] Hospitals Contracts [Member]	Jun. 30, 2012 Reportable operating segments [Member] Hospitals Contracts [Member]	Jun. 30, 2013 Reportable operating segments [Member] Hospitals Contracts [Member]	Jun. 30, 2012 Reportable operating segments [Member] Hospitals Contracts [Member]
Segment Reporting Information [Line Items]
Working period with major customers								30 years	15 years
Number of Aircraft Operated						167										91		8
Segment revenue				62.00%	65.00%	62.00%	66.00%			1.00%	1.00%	1.00%	2.00%	37.00%	34.00%	37.00%	32.00%		38.00%	18.00%	39.00%	19.00%
Number of states in which company operates aircrafts																18
Locations in which company operates Aircrafts																69		6
Number of Contracts	0
Fixed Revenue Streams	0
Allowance for contractual discounts	$ 66.7	$ 54.6	$ 61.6
Allowance for uncompensated care	$ 45.3	$ 48.0	$ 35.3