Summary of Significant Accounting Policies (Details)	12 Months Ended
	Dec. 31, 2012
Relocatable modular buildings [Member]
Estimated useful lives and residual values of the Company's rental equipment
Property subject to or available for operating lease useful life	18 years
Percentage residual value property subject to or available for operating lease	50.00%
Relocatable modular accessories [Member]
Estimated useful lives and residual values of the Company's rental equipment
Percentage residual value property subject to or available for operating lease	0.00%
Relocatable modular accessories [Member] | Minimum [Member]
Estimated useful lives and residual values of the Company's rental equipment
Property subject to or available for operating lease useful life	3 years
Relocatable modular accessories [Member] | Maximum [Member]
Estimated useful lives and residual values of the Company's rental equipment
Property subject to or available for operating lease useful life	18 years
Portable storage containers [Member]
Estimated useful lives and residual values of the Company's rental equipment
Property subject to or available for operating lease useful life	25 years
Percentage residual value property subject to or available for operating lease	62.50%
Electronic test equipment and accessories [Member]
Estimated useful lives and residual values of the Company's rental equipment
Percentage residual value property subject to or available for operating lease	0.00%
Electronic test equipment and accessories [Member] | Minimum [Member]
Estimated useful lives and residual values of the Company's rental equipment
Property subject to or available for operating lease useful life	1 year
Electronic test equipment and accessories [Member] | Maximum [Member]
Estimated useful lives and residual values of the Company's rental equipment
Property subject to or available for operating lease useful life	8 years
Liquid and solid containment tanks and boxes and accessories [Member]
Estimated useful lives and residual values of the Company's rental equipment
Percentage residual value property subject to or available for operating lease	0.00%
Liquid and solid containment tanks and boxes and accessories [Member] | Minimum [Member]
Estimated useful lives and residual values of the Company's rental equipment
Property subject to or available for operating lease useful life	10 years
Liquid and solid containment tanks and boxes and accessories [Member] | Maximum [Member]
Estimated useful lives and residual values of the Company's rental equipment
Property subject to or available for operating lease useful life	20 years