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Investments (Change in Accounting Principle) (Details) (USD $)
 12 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2013
General Finance Incorporated (GFI) [Member]
Dec. 31, 2012
General Finance Incorporated (GFI) [Member]
Dec. 31, 2011
General Finance Incorporated (GFI) [Member]
Dec. 31, 2010
General Finance Incorporated (GFI) [Member]
Adjusted for prior periods beginning 2001 [Member]
Dec. 31, 2013
As Previously Reported [Member]
Sep. 30, 2013
As Previously Reported [Member]
Jun. 30, 2013
As Previously Reported [Member]
Mar. 31, 2013
As Previously Reported [Member]
Dec. 31, 2012
As Previously Reported [Member]
Sep. 30, 2012
As Previously Reported [Member]
Jun. 30, 2012
As Previously Reported [Member]
Mar. 31, 2012
As Previously Reported [Member]
Dec. 31, 2012
As Previously Reported [Member]
General Finance Incorporated (GFI) [Member]
Dec. 31, 2011
As Previously Reported [Member]
General Finance Incorporated (GFI) [Member]
Dec. 31, 2010
As Previously Reported [Member]
General Finance Incorporated (GFI) [Member]
Adjusted for prior periods beginning 2001 [Member]
Schedule of Equity Method Investments [Line Items]                                      
Investments           $ 25,298,086                     $ 27,380,650    
Investments in affiliates 3,428,633 2,626,200     3,428,633 2,626,200                     0    
Retained earnings 98,518,546 97,758,013       97,758,013 98,320,771 102,802,198                 97,214,376 97,751,202 102,270,564
Total stockholders' equity 114,432,381 102,902,450 98,642,947 101,628,691   102,902,450 98,642,947                   102,358,813 98,073,378  
Dividend income 1,673,430 65,555 285,283     65,555                     71,177    
Equity in affiliate earnings (losses), net of tax 127,446 (20,310) 37,935   127,446 (20,310) 37,935                   0 0  
Net income $ 5,442,711 $ 3,129,785 $ 1,590,243     $ 3,129,785 $ 1,590,243   $ 3,551,689 $ 1,972,388 $ 1,878,751 $ (1,939,219) $ (202,179) $ 2,260,374 $ 3,336,857 $ (2,239,335) $ 3,155,717 $ 1,552,308  
Net income per share (in dollars per share) $ 1.36 $ 0.78 $ 0.39     $ 0.78 $ 0.39   $ 0.88 $ 0.49 $ 0.47 $ (0.48) $ (0.04) $ 0.56 $ 0.83 $ (0.56) $ 0.79 $ 0.38