Reconciliation of Net Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Distribution Made to Limited Partner [Line Items]
Net loss	$ (8,651)	$ (4,644)	$ (16,126)	$ (13,154)
Less: Incentive distribution right ("IDR") payments to general partner	1,195	975	2,387	1,786
Net loss to allocate to general and limited partners	(9,846)	(5,619)	(18,513)	(14,940)
General partner's interest excluding IDRs	(110)	(76)	(214)	(202)
Limited partners' interest	$ (9,736)	$ (5,543)	$ (18,299)	$ (14,738)