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Subsequent Events - Additional Information (Detail) $ / shares in Units, shares in Millions, T in Millions, $ in Millions |  |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 18, 2016 shares | Feb. 12, 2016 $ / shares | Feb. 01, 2016 USD ($) | Feb. 29, 2016 USD ($) MBoe operation Wells T | Dec. 31, 2015 MBoe shares | Feb. 17, 2016 shares | Dec. 31, 2014 shares
Subsequent Event [Line Items] |  |  |  |  |  |  |
Common units outstanding (in shares) | shares |  |  |  |  | 12.2 |  | 12.2
Sales of properties (in MBoe) | MBoe |  |  |  |  | 108 |  |
Subsequent Event [Member] |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Distribution paid (in dollar per share) | $ / shares |  | $ 0.45 |  |  |  |  |
Common units outstanding (in shares) | shares | 12.2 |  |  |  |  | 122.3 |
Common Stock [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Reverse split ratio, common units | 0.1 |  |  |  |  |  |
Appalachian Basin [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Proceeds from sale of royalty and overriding royalty interests |  |  |  | $ 36.6 |  |  |
Gain on sale |  |  |  | $ 20.3 |  |  |
Number of gross producing wells | Wells |  |  |  | 765 |  |  |
Percent of estimated proved reserves |  |  |  | 10.00% |  |  |
Sales of properties (in MBoe) | MBoe |  |  |  | 1,094 |  |  |
Texas, Georgia, Tennessee [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Proceeds from sale of royalty and overriding royalty interests |  |  | $ 9.8 |  |  |  |
Gain on sale |  |  | $ 1.6 |  |  |  |
Disposition of reserves and related royalty rights, number of operations | operation |  |  |  | 3 |  |  |
Percent of proved reserves and related royalty rights sold |  |  |  | 27.00% |  |  |
Disposition of proved reserves (in tons) | T |  |  |  | 139 |  |  |

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- Definition Per unit of ownership amount of cash distributions paid to unit-holder of a limited partnership (LP). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70434-108055 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055 + Details
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