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Property, Plant and Equipment - Additional Information (Detail) $ in Thousands, MMcf / d in Millions |  | 12 Months Ended
--- | --- | ---
Nov. 06, 2017 MMcf / d | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |
Impairment charge |  | $ 6,887 | $ 4,684 | $ 46,109
Carrying value of assets |  | 6,173,486 | 5,919,567 | 5,218,242
Proved oil and gas properties |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Asset retirement costs |  | 39,900 | 42,900 |
Impairment charge |  | 3,600 |  | 9,400
Unproved oil and gas properties |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Impairment charge |  | 6,900 | $ 1,100 | 36,600
Midstream Services | Proved oil and gas properties |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Impairment charge |  | 2,400 |  |
Exploration and Production | Proved oil and gas properties |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Impairment charge |  | 1,100 |  |
Carrying value of assets |  |  |  | 25,900
Estimated fair value of assets |  |  |  | $ 16,500
Affiliated Entity [Member] | Gas Gathering, Compression, Processing and Gas Lift Agreement [Member] | Contract for Construction of Natural Gas Processing Plant [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Processing plant capacity (in cubic ft per day) | MMcf / d | 200 |  |  |
Affiliated Entity [Member] | Gas Gathering, Compression, Processing and Gas Lift Agreement [Member] | Estimated Reimbursements, Plant II [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Estimate of reimbursable amounts from OMP |  | $ 66,700 |  |

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- Definition The amount of asset retirement costs previously incurred and capitalized separately from the capitalized amount of the associated long-lived assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61901-109447 + Details
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- Definition The expense recorded to reduce the value of oil and gas assets consisting of proved properties and unproved properties as the estimate of future successful production from these properties is reduced. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84176398&loc=d3e2921-110230 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Section 35 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66906256&loc=d3e66150-109466 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition Fair value portion of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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