Revenue Concentration (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Five Investment Arrangers [Member] | Container Management [Member]
Concentration Risk [Line Items]
Number of major customers	5
Two Largest Container Investors [Member] | Container Management [Member]
Concentration Risk [Line Items]
Number of major customers	2
Ten Largest Container Lessees [Member] | Container Leasing [Member]
Concentration Risk [Line Items]
Number of major customers	10
Revenue [Member] | Container Leasing [Member]
Concentration Risk [Line Items]
Concentration of risk (in hundredths)	11.70%	9.90%	6.90%
Revenue [Member] | Container Management [Member]
Concentration Risk [Line Items]
Concentration of risk (in hundredths)	3.00%
Revenue [Member] | Five Investment Arrangers [Member] | Container Management [Member]
Concentration Risk [Line Items]
Concentration of risk (in hundredths)	62.60%	65.40%	80.90%
Revenue [Member] | Two Largest Container Investors [Member] | Container Management [Member]
Concentration Risk [Line Items]
Concentration of risk (in hundredths)	38.30%
Concentration of risk, amount	5.1
Revenue [Member] | Ten Largest Container Lessees [Member] | Container Leasing [Member]
Concentration Risk [Line Items]
Concentration of risk (in hundredths)	58.50%	57.60%	54.00%
Revenue [Member] | Single Largest Container Lessee [Member] | Container Leasing [Member]
Concentration Risk [Line Items]
Concentration of risk (in hundredths)	12.60%	11.30%	8.30%
Concentration of risk, amount	20.3	12.5	5.4