Supplemental Oil and Natural Gas Disclosure (Unaudited) - Estimated Net Quantities of Partnership Proved, Proved Developed and Proved Undeveloped Oil and Natural Gas Reserve (Details)	12 Months Ended
	Dec. 31, 2017 MBoe MBbls MMcf	Dec. 31, 2016 MBoe MBbls MMcf	Dec. 31, 2015 MBoe MBbls MMcf
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward]
Balance at the beginning of the period	63,425	49,788	51,109
Revisions of previous estimates	2,277	7,844	(3,037)
Purchases of minerals in place	7,309	2,269	69
Extensions, discoveries and other additions	8,449	15,120	12,110
Production	(13,515)	(11,596)	(10,463)
Balance at the end of the period	67,945	63,425	49,788
Net Proved Developed Reserves	56,727	55,327	44,590
Net Proved Undeveloped Reserves	11,218	8,098	5,198
Noncontrolling Interest
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward]
Net Proved Developed Reserves	61	74	84
Net Proved Undeveloped Reserves	0	0	0
Crude Oil
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward]
Balance at the beginning of the period | MBbls	18,368	15,842	17,067
Revisions of previous estimates | MBbls	(1,234)	3,007	(197)
Purchases of minerals in place | MBbls	2,267	1,322	8
Extensions, discoveries and other additions | MBbls	2,050	1,877	2,529
Production | MBbls	(3,552)	(3,680)	(3,565)
Balance at the End of the period | MBbls	17,899	18,368	15,842
Net proved developed reserves | MBbls	17,891	18,150	15,497
Net proved undeveloped reserves | MBbls	8	218	345
Natural Gas Reserves
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward]
Balance at the beginning of the period | MMcf	270,339	203,675	204,256
Revisions of previous estimates | MMcf	21,067	29,024	(17,043)
Purchases of minerals in place | MMcf	30,250	5,683	367
Extensions, discoveries and other additions | MMcf	38,397	79,455	57,484
Production | MMcf	(59,779)	(47,498)	(41,389)
Balance at the End of the period | MMcf	300,274	270,339	203,675
Net proved developed reserves | MMcf	233,017	223,057	174,555
Net proved undeveloped reserves | MMcf	67,257	47,282	29,120