Earnings (loss) per Limited Partner Unit - Computation of Basic and Diluted Earnings per Limited Partner Unit (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share [Abstract]
Net income (loss)	$ (523)	$ (11,697)	$ 11,795	$ (33,199)
Basic and diluted weighted average number of limited partner units outstanding (in shares)	86,997,590	86,997,590	86,997,590	86,997,590
Basic and diluted net income (loss) per limited partner unit (in USD per share)	$ (0.01)	$ (0.13)	$ 0.14	$ (0.38)