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Debt Obligations - Marine Services, CWind Credit Facilities (Details) - CWind Limited
$ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2017
GBP (£)
Feb. 29, 2016
GBP (£)
note_payable
Convertible notes      
Debt Instrument [Line Items]      
Number of instruments | note_payable     14
Aggregate principal amount     £ 16,300,000.0
Minimum | Convertible notes      
Debt Instrument [Line Items]      
Interest rate (as a percent)     7.50%
Maximum | Convertible notes      
Debt Instrument [Line Items]      
Interest rate (as a percent)     7.62%
Germany | Base Rate      
Debt Instrument [Line Items]      
Variable rate floor 0.50%    
Revolving Credit Facility      
Debt Instrument [Line Items]      
Line of credit outstanding amount | $ $ 16.2    
Revolving Credit Facility | Germany      
Debt Instrument [Line Items]      
Interest rate (as a percent) 2.00% 2.00%  
Line of credit, maximum amount   £ 1,500,000.0