Investments (Change in Accounting Principle) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2012
Schedule of Equity Method Investments [Line Items]
INVESTMENTS	$ 29,379,249		$ 29,379,249			$ 25,292,634
Investments in affiliates	4,008,136		4,008,136			3,428,633
Retained earnings	105,536,192	97,076,067	105,536,192	97,076,067	100,247,941	98,518,546	96,413,662	97,758,013
Total stockholders' equity	123,438,435		123,438,435			114,432,381
Dividend income	422,650	87,786	622,496	1,573,786
Equity in affiliate earnings (losses), net of tax	52,489	(3,022)	58,327	(15,275)
Net income	6,247,378	1,969,365	8,916,876	1,891,022
Net income per share (in dollars per share)	$ 1.57	$ 0.50	$ 2.25	$ 0.48
General Finance Incorporated (GFI) [Member]
Schedule of Equity Method Investments [Line Items]
Investments in affiliates	4,008,136		4,008,136			3,428,633
Equity in affiliate earnings (losses), net of tax		(3,022)		(15,275)
Net income		1,969,365		1,891,022
Net income per share (in dollars per share)		$ 0.50		$ 0.48
As Previously Reported [Member] \| General Finance Incorporated (GFI) [Member]
Schedule of Equity Method Investments [Line Items]
Equity in affiliate earnings (losses), net of tax		0		0
Net income		$ 1,972,388		$ 1,911,920
Net income per share (in dollars per share)		$ 0.49		$ 0.48

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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- Definition

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 20

-Article 9

Reference 2: http://www.xbrl.org/2003/role/presentationRef

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Other Comprehensive Income

-URI http://asc.fasb.org/extlink&oid=6519514

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Net Income

-URI http://asc.fasb.org/extlink&oid=6518256

Reference 5: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Topic 260

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

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Reference 7: http://www.xbrl.org/2003/role/presentationRef

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Reference 8: http://www.xbrl.org/2003/role/presentationRef

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Reference 9: http://www.xbrl.org/2003/role/presentationRef

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Reference 10: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 19

-Article 5

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- Definition

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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