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Supplemental Oil and Gas Reserve Information - Unaudited - Net Proved, Proved Developed and Proved Undeveloped Reserves (Detail) | 1 Months Ended | 12 Months Ended |  |  |
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Mar. 31, 2014 MBoe | Dec. 31, 2015 MBbls | Dec. 31, 2015 MBbls MMcf | Dec. 31, 2015 MBoe MBbls | Dec. 31, 2014 MBbls | Dec. 31, 2014 MBbls MMcf | Dec. 31, 2014 MBoe MBbls | Dec. 31, 2013 MBbls | Dec. 31, 2013 MBbls MMcf | Dec. 31, 2013 MBoe MBbls | Dec. 31, 2015 MMcf | Dec. 31, 2015 MBoe | Dec. 31, 2014 MMcf | Dec. 31, 2014 MBoe | Dec. 31, 2013 MMcf | Dec. 31, 2013 MBoe
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proved reserves (Volume), beginning balance |  | 235,399 | 220,120 |  | 198,590 | 175,979 |  | 128,090 | 91,530 |  |  |  |  |  |  |
Proved reserves (Energy), beginning balance |  |  |  | 272,086 |  |  | 227,920 |  |  | 143,345 |  |  |  |  |  |
Revisions of previous estimates (Volume) |  | (75,458) | (55,065) |  | (23,069) | (12,290) |  | 3,390 | 10,412 |  |  |  |  |  |  |
Revisions of previous estimates (Energy) |  |  |  | (84,635) |  |  | (25,117) |  |  | 5,125 |  |  |  |  |  |
Extensions, discoveries and other additions (Volume) |  | 38,962 | 46,072 |  | 80,855 | 70,449 |  | 40,784 | 31,856 |  |  |  |  |  |  |
Extensions, discoveries and other additions (Energy) |  |  |  | 46,640 |  |  | 92,596 |  |  | 46,094 |  |  |  |  |  |
Sales of reserves in place (Volume) |  | 0 | 0 |  | (7,640) | (4,850) |  | 0 | 0 |  |  |  |  |  |  |
Sales of reserves in place (Energy) | (8,448) |  |  | 0 |  |  | (8,448) |  |  | 0 |  |  |  |  |  |
Purchases of reserves in place (Volume) |  | 2,115 | 2,702 |  | 1,546 | 1,523 |  | 37,459 | 49,631 |  |  |  |  |  |  |
Purchases of reserves in place (Energy) |  |  |  | 2,565 |  |  | 1,799 |  |  | 45,731 |  |  |  |  |  |
Production (Volume) |  | (16,090) | (14,001) |  | (14,883) | (10,691) |  | (11,133) | (7,450) |  |  |  |  |  |  |
Production (Energy) |  |  |  | (18,423) |  |  | (16,664) |  |  | (12,375) |  |  |  |  |  |
Net proved reserves (Volume), closing balance |  | 184,928 | 199,828 |  | 235,399 | 220,120 |  | 198,590 | 175,979 |  |  |  |  |  |  |
Net proved reserves (Energy), closing balance |  |  |  | 218,233 |  |  | 272,086 |  |  | 227,920 |  |  |  |  |  |
Proved developed reserves (Volume) |  | 127,445 | 127,445 | 127,445 | 127,340 | 127,340 | 127,340 | 106,774 | 106,774 | 106,774 | 120,789 |  | 114,016 |  | 92,170 |
Proved developed reserves (Energy) |  |  |  |  |  |  |  |  |  |  |  | 147,577 |  | 146,343 |  | 122,136
Proved undeveloped reserve (Volume) |  | 57,483 | 57,483 | 57,483 | 108,059 | 108,059 | 108,059 | 91,816 | 91,816 | 91,816 | 79,039 |  | 106,104 |  | 83,809 |
Proved undeveloped reserves (Energy) |  |  |  |  |  |  |  |  |  |  |  | 70,656 |  | 125,743 |  | 105,784

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Energy measure of increase in quantity of proved reserve of oil and gas resulting from the extension of the proved acreage of previously discovered reservoir or discovery of new field with proved reserve or of new reservoir of proved reserve in old field, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e61831-109447 + Details
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- Definition Energy measure of decrease in quantity of proved reserve of oil and gas resulting from production, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 5 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e61831-109447 + Details
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- Definition Energy measure of increase in quantity of proved reserve of oil and gas resulting from purchase of mineral in place, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e61831-109447 + Details
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- Definition Energy measure of increase (decrease) in quantity of proved reserve of oil and gas related to revision of a previous estimate resulting from new information, except for an increase in proved acreage, or change in economic factors, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e61831-109447 + Details
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- Definition Additions to proved reserves that result from (1) extension of the proved acreage of previously discovered (old) reservoirs through additional drilling in periods after discovery and (2) discovery of new fields with proved reserves or of new reservoirs of proved reserves in old fields. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e61831-109447 + Details
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- Definition The net quantity of proved reserves as of the balance sheet date. Proved oil reserves are the estimated quantities of crude oil and natural gas liquids which geological and engineering data demonstrate with reasonable certainty to be recoverable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e61831-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10.(a)(2)) -URI http://asc.fasb.org/extlink&oid=50486907&loc=d3e511914-122862 + Details
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- Definition Revisions represent changes in previous estimates of proved reserves, either upward or downward, resulting from new information (except for an increase in proved acreage) normally obtained from development drilling and production history or resulting from change in economic factors. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e61831-109447 + Details
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- Definition Energy measure of decrease in quantity of proved reserve of oil and gas resulting from sale of mineral in place, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e61831-109447 + Details
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- Definition Energy measure of interests in proved developed reserves of crude oil, including condensate and natural gas liquids, natural gas, synthetic oil and gas, or other nonrenewable natural resource that is intended to be upgraded into synthetic oil and gas. + References No definition available. + Details
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- Definition Net quantities of an enterprise's interests in proved developed reserves of either crude oil (including condensate and natural gas liquids), natural gas, synthetic oil and gas, or other nonrenewable natural resource that is intended to be upgraded into synthetic oil and gas as of the beginning and the end of the year. "Net" quantities of reserves include those relating to the enterprise's operating and nonoperating interests in properties. Quantities of reserves relating to royalty interests owned are included in "net" quantities if the necessary information is available to the enterprise. "Net" quantities does not include reserves relating to interests of others in properties owned by the enterprise. The unit of measure for reserve quantities is defined as "barrels" for oil and synthetic oil reserves or "cubic feet" or "cubic meters" for natural gas and synthetic gas reserves. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e61884-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e61797-109447 + Details
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- Definition Net quantities of an enterprise's interests in proved undeveloped reserves of either crude oil (including condensate and natural gas liquids), natural gas, synthetic oil and gas, or other renewable natural resource that is intended to be upgraded into synthetic oil and gas as of the beginning and the end of the year. "Net" quantities of reserves include those relating to the enterprise's operating and nonoperating interests in properties. Quantities of reserves relating to royalty interests owned are included in "net" quantities if the necessary information is available to the enterprise. "Net" quantities does not include reserves relating to interests of others in properties owned by the enterprise. The unit of measure for reserve quantities is defined as "barrels" for oil and synthetic oil reserves or "cubic feet" or "cubic meters" for natural gas and synthetic gas reserves. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e61884-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e61797-109447 + Details
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