Quarterly Financial Data - Summary of Unaudited Condensed Consolidated Statements of Operations by Financial Statement (Detail) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended											6 Months Ended	9 Months Ended	12 Months Ended
		Dec. 31, 2016	Sep. 30, 2016		Jun. 30, 2016		Mar. 31, 2016		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
Condensed Income Statements Captions [Line Items]
Gain (loss) on revaluation of contingent consideration			$ (545)		$ 659		$ 189						$ 848	$ 303	$ 1,043	$ 0	$ 0
Operating income		$ 4,328	5,808	[1]	6,878	[1]	4,974	[1]	$ 3,626	$ 3,393	$ 1,863	$ (1,187)	11,852	17,659	21,988	7,697	(4,873)
Net income			5,791		6,934		5,040						11,975	17,765	21,908	10,744	1,275
Net income attributable to partners' capital		$ 2,831	$ 4,132	[1]	$ 4,850	[1]	$ 3,229	[1]	$ 1,935	$ 2,001	$ 2,188	$ 304	$ 8,081	$ 12,212	$ 15,042	$ 6,429	$ 1,275
Common Units [Member]
Condensed Income Statements Captions [Line Items]
Earnings per limited partner unit, basic and diluted		$ 0.22	$ 0.20	[1]	$ 0.24	[1]	$ 0.15	[1]	$ 0.09	$ 0.19	$ 0.20	$ 0.01	$ 0.39	$ 0.59	$ 0.83	$ 0.39	$ 0.05
Subordinated Units [Member]
Condensed Income Statements Captions [Line Items]
Earnings per limited partner unit, basic and diluted		$ (0.30)	$ 0.20	[1]	$ 0.24	[1]	$ 0.15	[1]	$ 0.09	$ 0.00	$ 0.02	$ 0.01	$ 0.39	$ 0.59	$ 0.47	$ 0.22	$ 0.05
As Previously Reported [Member]
Condensed Income Statements Captions [Line Items]
Operating income			$ 6,353		$ 6,219		$ 4,785						$ 11,004	$ 17,356
Net income			6,336		6,275		4,851						11,127	17,462
Net income attributable to partners' capital			$ 4,458		$ 4,455		$ 3,116						$ 7,572	$ 12,029
As Previously Reported [Member] | Common Units [Member]
Condensed Income Statements Captions [Line Items]
Earnings per limited partner unit, basic and diluted			$ 0.22		$ 0.22		$ 0.15						$ 0.37	$ 0.58
As Previously Reported [Member] | Subordinated Units [Member]
Condensed Income Statements Captions [Line Items]
Earnings per limited partner unit, basic and diluted			$ 0.22		$ 0.22		$ 0.15						$ 0.36	$ 0.58
Adjustments [Member]
Condensed Income Statements Captions [Line Items]
Gain (loss) on revaluation of contingent consideration	[2]		$ (545)		$ 659		$ 189						$ 848	$ 303
Operating income	[2]		(545)		659		189						848	303
Net income	[2]		(545)		659		189						848	303
Net income attributable to partners' capital	[2]		$ (326)		$ 395		$ 113						$ 509	$ 183
Adjustments [Member] | Common Units [Member]
Condensed Income Statements Captions [Line Items]
Earnings per limited partner unit, basic and diluted	[2]		$ (0.02)		$ 0.02								$ 0.02	$ 0.01
Adjustments [Member] | Subordinated Units [Member]
Condensed Income Statements Captions [Line Items]
Earnings per limited partner unit, basic and diluted	[2]		$ (0.02)		$ 0.02								$ 0.03	$ 0.01

[1] Amounts have been revised as disclosed below

[2] The Partnership revised the amounts originally reported for the periods above for the fair value adjustment to the JBBR Acquisition contingent consideration obligation.