Quarterly Financial Data - Schedule of Quarterly Financial Data (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended											6 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	[1]	Jun. 30, 2016	[1]	Mar. 31, 2016	[1]	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2016	Sep. 30, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Schedule Of Quarterly Financial Data [Line Items]
Revenues	$ 26,398	$ 26,672		$ 26,244		$ 26,067		$ 25,037	$ 24,084	$ 19,110	$ 13,557			$ 105,381	$ 81,789	$ 54,906
Operating income (loss)	4,328	5,808		6,878		4,974		3,626	3,393	1,863	(1,187)	$ 11,852	$ 17,659	21,988	7,697	(4,873)
Net income (loss) attributable to partners’ capital	$ 2,831	$ 4,132		$ 4,850		$ 3,229		$ 1,935	$ 2,001	$ 2,188	$ 304	$ 8,081	$ 12,212	$ 15,042	$ 6,429	$ 1,275
Common Units [Member]
Net income (loss) per limited partner unit (basic and diluted):
Basic and diluted net income (loss) per limited partner unit	$ 0.22	$ 0.20		$ 0.24		$ 0.15		$ 0.09	$ 0.19	$ 0.20	$ 0.01	$ 0.39	$ 0.59	$ 0.83	$ 0.39	$ 0.05
Weighted average number of limited partners units outstanding (basic and diluted):
Weighted average number of limited partners units outstanding, basic and diluted	16,345	13,209		13,181		13,176		13,172	9,152	9,253	6,868
Subordinated Units [Member]
Net income (loss) per limited partner unit (basic and diluted):
Basic and diluted net income (loss) per limited partner unit	$ (0.30)	$ 0.20		$ 0.24		$ 0.15		$ 0.09	$ 0.00	$ 0.02	$ 0.01	$ 0.39	$ 0.59	$ 0.47	$ 0.22	$ 0.05
Weighted average number of limited partners units outstanding (basic and diluted):
Weighted average number of limited partners units outstanding, basic and diluted	3,107	6,081		6,081		6,081		6,081	6,081	6,081	6,081

[1] Amounts have been revised as disclosed below