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Acquisitions (Narrative) (Details) |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended |  |
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Sep. 01, 2017 USD ($) | Mar. 24, 2017 USD ($) | Jul. 27, 2016 USD ($) | Jul. 24, 2015 USD ($) platform | Jul. 23, 2015 USD ($) | Jul. 22, 2015 USD ($) | Apr. 10, 2015 USD ($) | Jul. 31, 2015 USD ($) shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 USD ($) | Aug. 14, 2017 USD ($) | Jul. 25, 2015
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  |  |  |  |  |  |  |  | $ 1,325,759,000 | $ 25,394,000 | $ 1,520,299,000 |  |
Proceeds from issuance of Class A convertible preferred units, net |  |  |  |  |  |  |  |  | $ 726,419,000 | $ 0 | 0 |  |
Common units issued (in shares) | shares |  |  |  |  |  |  |  |  | 122,579,218 | 117,979,218 |  |  |
Net proceeds received from sale of units, net of underwriter discounts |  | $ 140,513,000 | $ 298,452,000 |  |  | $ 437,164,000 | $ 198,168,000 |  |  |  |  |  |
Asset retirement obligation, preliminary fair value |  |  |  |  |  |  |  |  |  | $ 20,940,000 |  |  |
Asset retirement obligation, retirement costs |  |  |  |  |  |  |  |  | $ 198,187,000 | 213,726,000 | 188,662,000 |  |
Poseidon Oil Pipeline Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity investment, ownership percentage |  |  |  |  |  |  |  |  | 64.00% |  |  |  |
SEKCO [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity investment, ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  | 50.00%
Accrued Liabilities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Asset retirement obligation, retirement costs |  |  |  |  |  |  |  |  | $ 20,900,000 | 22,400,000 |  |  |
Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity, Stock Issued During Period, Value, New Issues | $ 750,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Convertible Preferred Stock [Member] | Private Placement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity, Stock Issued During Period, Value, New Issues | 750,000,000 |  |  |  |  |  |  |  |  |  |  |  |
6.500% senior unsecured notes |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issued, aggregate principal amount |  |  |  |  |  |  |  |  | 550,000,000 | 0 |  |  |
6.750% senior unsecured notes |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issued, aggregate principal amount |  |  |  |  | $ 750,000,000 |  |  |  | 750,000,000 | 750,000,000 |  |  |
Alkali Business [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross | 1,325,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Working Capital | $ 105,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Acquisition related costs |  |  |  |  |  |  |  |  | $ 12,000,000 |  |  |  |
Alkali Business [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives of property and equipment acquired | 2 years |  |  |  |  |  |  |  |  |  |  |  |
Alkali Business [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives of property and equipment acquired | 30 years |  |  |  |  |  |  |  |  |  |  |  |
Alkali Business [Member] | Convertible Preferred Stock [Member] | Private Placement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity, Stock Issued During Period, Value, New Issues | $ 750,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of Class A convertible preferred units, net | 726,400,000 |  |  |  |  |  |  |  |  |  |  |  |
Alkali Business [Member] | 6.500% senior unsecured notes |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issued, aggregate principal amount | $ 550,000,000 |  |  |  |  |  |  |  |  |  |  | $ 550,000,000 |
Debt instrument, stated rate | 6.50% |  |  |  |  |  |  |  |  |  |  | 6.50% |
Proceeds from issuance of debt, net of discount | $ 540,100,000 |  |  |  |  |  |  |  |  |  |  |  |
Enterprise Offshore Acquisition [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issued, aggregate principal amount |  |  |  |  |  |  |  | $ 750,000,000 |  |  |  |  |
Acquisition related costs |  |  |  |  |  |  |  |  |  | $ 1,000,000 | 15,000,000 |  |
Transaction costs related to business acquisition |  |  |  | $ 1,500,000,000 |  |  |  |  |  |  |  |  |
Business Acquisition, Effective Date of Acquisition |  |  |  | Jul. 24, 2015 |  |  |  |  |  |  |  |  |
Number of offshore hub platforms | platform |  |  |  | 6 |  |  |  |  |  |  |  |  |
Common units issued (in shares) | shares |  |  |  |  |  |  |  | 10,350,000 |  |  |  |  |
Net proceeds received from sale of units, net of underwriter discounts |  |  |  |  |  |  |  | $ 437,200,000 |  |  |  |  |
Estimated useful life of finite-lived intangible assets acquired |  |  |  | 19 years |  |  |  |  |  |  |  |  |
Asset retirement obligation, preliminary fair value |  |  |  |  |  |  |  |  |  |  | $ 158,200,000 |  |
Enterprise Offshore Acquisition [Member] | Poseidon Oil Pipeline Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity investment, ownership percentage |  |  |  | 36.00% |  |  |  |  |  |  |  |  |
Enterprise Offshore Acquisition [Member] | SEKCO [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity investment, ownership percentage |  |  |  | 50.00% | 50.00% |  |  |  |  |  | 50.00% |  |
Enterprise Offshore Acquisition [Member] | CHOPS [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity investment, ownership percentage |  |  |  | 50.00% | 50.00% |  |  |  |  |  | 50.00% |  |
Enterprise Offshore Acquisition [Member] | Independence Hub, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity investment, ownership percentage |  |  |  | 80.00% |  |  |  |  |  |  |  |  |
Noncontrolling interest ownership percentage |  |  |  | 20.00% |  |  |  |  |  |  |  |  |
Enterprise Offshore Acquisition [Member] | Accrued Liabilities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Asset retirement obligation, retirement costs |  |  |  |  |  |  |  |  |  |  | $ 9,800,000 |  |
Enterprise Offshore Acquisition [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives of property and equipment acquired |  |  |  | 2 years |  |  |  |  |  |  |  |  |
Enterprise Offshore Acquisition [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives of property and equipment acquired |  |  |  | 35 years |  |  |  |  |  |  |  |  |
Enterprise Offshore Acquisition [Member] | 6.750% senior unsecured notes |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, stated rate |  |  |  |  | 6.75% |  |  |  |  |  |  |  |
Proceeds from issuance of debt, net of discount |  |  |  |  | $ 728,600,000 |  |  |  |  |  |  |  |

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