Annual report pursuant to Section 13 and 15(d)

INVESTMENTS, AT EQUITY, ADVANCES TO 50% OR LESS OWNED COMPANIES Aeroleo Narrative (Details)

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INVESTMENTS, AT EQUITY, ADVANCES TO 50% OR LESS OWNED COMPANIES Aeroleo Narrative (Details) (USD $)
12 Months Ended 0 Months Ended 6 Months Ended 9 Months Ended 0 Months Ended 6 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Jul. 02, 2011
Era do Brazil [Member]
Dec. 31, 2013
Era do Brazil [Member]
Dec. 31, 2011
Era do Brazil [Member]
Equity Method Investee [Member]
Sep. 30, 2012
Era do Brazil [Member]
Equity Method Investee [Member]
Dec. 31, 2012
Era do Brazil [Member]
Equity Method Investee [Member]
Jul. 02, 2011
Era do Brazil [Member]
Equity Method Investee [Member]
Mar. 02, 2012
Aeroleo [Member]
customer
Jul. 02, 2011
Aeroleo [Member]
Dec. 31, 2011
Aeroleo [Member]
helicopter
Dec. 31, 2013
Aeroleo [Member]
helicopter
Dec. 31, 2012
Aeroleo [Member]
helicopter
Jul. 02, 2011
Aeroleo [Member]
Equity Method Investee [Member]
Dec. 31, 2013
Aeroleo [Member]
Equity Method Investee [Member]
Dec. 31, 2012
Aeroleo [Member]
Equity Method Investee [Member]
Dec. 31, 2011
Aeroleo [Member]
Equity Method Investee [Member]
Jul. 02, 2011
Co-venturer [Member]
Era do Brazil [Member]
Jul. 02, 2011
Co-venturer [Member]
Aeroleo [Member]
Equity Method Investee [Member]
Schedule of Equity Method Investments [Line Items]                                        
Ownership       50.00% 50.00% [1]           50.00%   50.00% [2]              
Voting ownership percentage 50.00%                   20.00%                  
Payments to Acquire Equity Method Investments $ 0 $ 10,627,000 $ 21,840,000 $ 4,800,000             $ 4,800,000               $ 4,800,000  
Notes receivable to related party               10,800,000 2,000,000           6,000,000         6,000,000
Notes receivable interest rate                             6.00%         6.00%
Recognized impairment charge                   5,900,000       5,900,000            
Number of customers that cancelled contracts                   1                    
Number of helicopters leased                       11 11 11            
Revenue from related parties           300,000 400,000                 16,200,000 17,600,000 14,000,000    
Accounts receivable related parties                               $ 21,000,000 $ 5,300,000      
[1] Consolidated entity as of September 30, 2012.
[2] Investment impaired in March 2012.