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Acquisitions - Schedule of Adjustments to the Estimated Fair Value (Detail) - USD ($) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Nov. 12, 2014 | Oct. 01, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Consideration |  |  |  |  |
Cash paid |  |  | $ 0 | $ 168,978 | $ 0
Allocation of Purchase Price |  |  |  |  |
Mineral rights - proven oil and gas properties |  |  | 0 | 298,627 |
Mineral rights - probable and possible oil and gas resources |  |  | 0 | 40,800 |
Goodwill |  |  | $ 0 | $ 52,012 |
VantaCore Partners LP |  |  |  |  |
Consideration |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents |  | $ 168,978 |  |  |
NRP common units |  | 31,604 |  |  |
Total consideration given |  | 200,582 |  |  |
Allocation of Purchase Price |  |  |  |  |
Current assets |  | 37,222 |  |  |
Land, property and equipment |  | 59,946 |  |  |
Mineral rights |  | 111,500 |  |  |
Other assets |  | 4,347 |  |  |
Current liabilities |  | (16,953) |  |  |
Asset retirement obligation |  | (1,005) |  |  |
Goodwill |  | 5,525 |  |  |
Fair value of net assets acquired |  | $ 200,582 |  |  |
Sanish Field [Member] |  |  |  |  |
Consideration |  |  |  |  |
Cash paid | $ 339,093 |  |  |  |
Total consideration given | 339,100 |  |  |  |
Allocation of Purchase Price |  |  |  |  |
Mineral rights - proven oil and gas properties | 298,293 |  |  |  |
Mineral rights - probable and possible oil and gas resources | 40,800 |  |  |  |
Fair value of net assets acquired | $ 339,093 |  |  |  |

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- Definition Value of equity interests (such as common shares, preferred shares, or partnership interest) issued or issuable to acquire the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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