Revenue Concentration (Details) $ in Thousands	3 Months Ended																12 Months Ended
	Dec. 31, 2016 USD ($)	[1]	Sep. 30, 2016 USD ($)	[1]	Jun. 30, 2016 USD ($)	[1]	Mar. 31, 2016 USD ($)	[1]	Dec. 31, 2015 USD ($)	[1]	Sep. 30, 2015 USD ($)	[1]	Jun. 30, 2015 USD ($)	[1]	Mar. 31, 2015 USD ($)	[1]	Dec. 31, 2016 USD ($) item		Dec. 31, 2015 USD ($)		Dec. 31, 2014 USD ($)
Concentration Risk [Line Items]
Revenues	$ 77,274		$ 78,472		$ 71,642		$ 66,966		$ 65,692		$ 66,117		$ 59,366		$ 58,492		$ 294,354	[2]	$ 249,667	[2]	$ 227,589	[2],[3]
Ten Largest Container Lessees [Member] | Customer Concentration Risk [Member] | Total Revenue [Member]
Concentration Risk [Line Items]
Number of major customers | item																	10
Percentage of operations comprised by segment																	41.50%		51.90%		55.40%
Single Largest Container Lessee [Member] | Customer Concentration Risk [Member] | Total Revenue [Member]
Concentration Risk [Line Items]
Percentage of operations comprised by segment																	10.80%		11.60%		11.40%
Revenues																	$ 31,700		$ 29,000		$ 25,900

[1] Amounts for the quarters ended March 31, 2016 and 2015, June 30, 2016 and 2015, September 30, 2016 and 2015, and December 31, 2015 have been restated for immaterial corrections of identified errors relating to prepaid loan fees (see Note 2 (b) "Correction of Immaterial Errors")

[2] Amounts for the years ended December 31, 2015 and 2014 have been restated for immaterial corrections of identified errors relating to prepaid loan fees (see Note 2 (b) "Correction of Immaterial Errors").

[3] At the inception of the lease, the Company records the total minimum lease payments, executory costs, if any, and unguaranteed residual value as gross finance lease receivables. The gross finance lease receivables are reduced as customer payments are received. There was $2.1 million and no unguaranteed residual value, respectively, at December 31, 2016 and 2015, included in gross finance lease receivables. There were no executory costs included in gross finance lease receivables as of December 31, 2016 and 2015.