Interest Rate Derivatives - Additional Information (Details) - USD ($)		1 Months Ended		12 Months Ended
		Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2017		Dec. 31, 2016
Barclays Bank PLC 2 [Member]
Derivative [Line Items]
Derivative, Purchase Date			2017-06	2017-06		2014-07
Derivative, variable debt financing facility hedged			M31 TEBS	M31 TEBS	[1]	M31 TEBS	[1]
Fixed Interest Rate			1.50%	1.50%	[1]	3.00%	[1]
Derivative, purchase price			$ 139,000
Barclays Bank PLC 3 [Member]
Derivative [Line Items]
Derivative, Purchase Date			2017-06	2017-06
Derivative, variable debt financing facility hedged			M33 TEBS	M33 TEBS	[1]
Fixed Interest Rate			1.50%	1.50%	[1]
Derivative, purchase price			$ 358,000
Barclays Bank PLC 4 [Member]
Derivative [Line Items]
Derivative, Purchase Date		2017-09		2017-09
Derivative, variable debt financing facility hedged		M24 TEBS		M24 TEBS	[1]
Fixed Interest Rate	[1]			4.00%
Derivative, purchase price		$ 59,000
Derivative, variable interest rate		4.00%
Deutsche Bank [Member]
Derivative [Line Items]
Derivative, Purchase Date						2013-08
Derivative, variable debt financing facility hedged	[1]					M24 TEBS
Fixed Interest Rate	[1]					1.50%
Deutsche Bank [Member] | Interest Rate Swaps [Member]
Derivative [Line Items]
Cash collateral balances				$ 850,000		$ 1,400,000

[1] For additional details, see Note 25 to the Partnership's condensed consolidated financial statements.