Quarterly report pursuant to Section 13 or 15(d)

Management and Advisory Agreements (Details)

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Management and Advisory Agreements (Details) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2014
Nov. 30, 2011
Dec. 31, 2014
Agreements (Textual) [Abstract]      
Annually rate of fee percentage on the value of company's average daily managed assets     0.04%
Administrator minimum annual fee $ 30    
Corridor Infra Trust Management [Member]      
Agreements (Textual) [Abstract]      
Quarterly management fee percentage on the value of company's average monthly managed assets   0.25%  
Annual management fee percentage on the value of company's average monthly managed assets   1.00%  
Quarterly incentive fee on increase in distributions paid   10.00%  
Threshold distribution per quarter   $ 0.125